Full Report - Feasibility Study KSCS K-Exim

Chapter 5. Conveyance System Planning 3) Boring log <Figure 5.75> Boring log of the booster pumping station site Source: data from Korea Rural Community Corporation Jakarta Office (March 2018) 5-131

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia <Table 5.77> Selection of foundation type Classification Direct foundation Pile foundation Overview Method ∙ when stiff layer is located shallow ∙ piles are installed so that the load is beneath the surface delivered to deep stiff layer ∙ pile heads are strongly coupled ∙ when the load of a structure above with the foundation is light Load Vertical ∙ reaction from the bottom ∙ point resistance of pile and support force frictional resistance Horizontal ∙ shearing resistance of the ∙ bending rigidity of pile, passive force foundation resistance of surrounding ground Choice ◉ Reason for choice ∙ Since the foundation base of the booster pumping station is soft rock, the direct foundation type is to be applied 5.10.7 Structural planning of the pumping station (1) General aspects 1) Basic design concept This civil engineering structure, which is made up with underground structure, serves the main purpose of pressurizing intake water and sending it to the water treatment plant. Therefore, the structure is required to have an appropriate strength that withstands load as well as durability including water resistance (watertightness), corrosion resistance, and chemical resistance. Besides, it needs to block soil and groundwater from coming inside. Therefore, a reinforced concrete rhamen structure is the most suitable structure that meets all the aforementioned requirements. Furthermore, considering that it is an environmental structure, it needs to be covered as far as possible not to cause displeasure to the neighborhood. Major loads such as building load and earth pressure are simple, but the shape and size of the structure will vary according to the intended use. 2) Structure plan The main structure is the booster pumping station whose size and specification will be planned according to its capacity and site situation. When planning a structure, the foundation type (depending on the soil condition) and the expansion joint (depending on the length of the structure) need to be considered. 5-132

Chapter 5. Conveyance System Planning (2) Structural design 1) Applicable standards and specifications To design a stable, economical structure that serves the purpose of construction, it is important to consider a range of factors including load, construction method, and site constraints need to be considered comprehensively and to comply with the following specifications and relevant laws and regulations. - ACI Manual of Concrete Practice - American Society for Testing and Materials (ASTM) - 1997 Uniform Building Code - Other related design standards 2) Design method ① Applied design method - Cross section design: ultimate strength design method - Serviceability design: allowable stress design ② Program: In the structural analysis of this design, we use a SAP2000 basic module of CSI, which was developed by Professor Edward L. Wilson of U.C. Berkeley. ③ Structural member design: To examine the stability of the member, the ultimate strength design method is used in which the cross-section area is calculated to be strong enough against ultimate strength by using the load coefficient and strength reduction coefficient. (3) Materials 1) Concrete Generally, it is advisable to use high strength concrete in terms of strength of the structural member. However, due to the low water-cement ratio (W/C) which is the main cause of the low workability, it is difficult to form high strength concrete. Bear in mind increasing the W/C ratio as part of an effort to improve workability will only deteriorate the strength of concrete and reduce watertightness. Therefore, regarding “the concrete that requires low water permeability when exposed to water” recommended in this design criteria, the compression strength will be more than 27MPa and the W/C ratio will be less than 0.5. 2) Reinforcing bar The water treatment structure does not only need to have a strength enough to withstand the design load but to have corrosion-resistance and durability. So, in this design, concrete will have the 28-day compressive strength and more (fck=27MPa) and reinforcing bar will have the yield point stress (fy=420MPa). Reinforcing bar with high yield point stress is highly recommended. It is stable and economical, which serves the purpose of design. It follows the standards below. ① Reinforcing bars ASTM A615/A615M-06a or equivalent 5-133

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia ② Steel wire ASTM A82 or equivalent ③ Steel welded wire fabric ASTM A185 or equivalent (4) Seismic design 1) Seismic zone The number and size of earthquakes are increasing throughout the world. In particular, Indonesia is one of the world’s most active earthquake zones. Among the major earthquakes that struck the country in recent years is the 2002 Sumatra earthquake with a magnitude of 7.4 and the Java earthquake that occurred twice in 2006 with a magnitude of 6.3 and 7.7, respectively. The latest earthquake occurred in January 2018, with a magnitude of 6.4. Given all this, buildings to be constructed need to be earthquake-proof. The area for the booster pumping station in this project falls under the seismic zone 3, with an acceleration coefficient of 0.2 to 0.25g. Therefore, an additional soil investigation needs to be conducted in the working design stage so that an earthquake-resistant design is reflected in the design of the structure. <Figure 5.76> shows Indonesia’s seismic zoning and acceleration coefficient. <Figure 5.76> Indonesia’s seismic zoning and acceleration coefficient Seismic Zoning) Acceleration Coefficient Zoning Value A Zoning Value A Zone 2 0.25~0.33g Zone 3 0.20~0.25g Zone 4 0.13~0.20g Zone 5 0.40~0.13g Zone 6 Over 0.33g - - <Figure 5.77> and <Figure 5.78> show the horizontal peak ground acceleration coefficient with 7 percent probability of exceedance in 75 years. 5-134

Chapter 5. Conveyance System Planning <Figure 5.77> Horizontal Peak Ground Acceleration Coefficient with 7 Percent Probability of Exceedance in 75 Years <Figure 5.78> Horizontal Peak Ground Acceleration Coefficient at Period of 0.2 Seconds (Ss) with 7 Percent Probability of Exceedance in 75 Years 5-135

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia 5.11 Mechanical works 5.11.1 Overview This project is to develop a water supply system that supplies water resources secured by the development of the Karian dam to the JABOTABEK region (Jakarta, Bogor, Tangerang, and Bekasi), which sees an increased demand for water and the probable water shortage due to the rapid urbanization. Through the Karian – Serpong conveyance system connecting to five water treatment plants (Rangkas Bitung, Maja, Solear, Parung Panjang, Serpong), it aims to distribute raw water to the entire project area encompassing Lebak regency, Tangerang regency, Tangerang city, South Tangerang city in Banten province; Bogor regency (Parung Panjang district) in West Java province; and West Jakarta province. The raw water supply system diagram is shown in <Figure 5.79>. <Figure 5.79> Raw water supply system diagram 5-136

Chapter 5. Conveyance System Planning 5.11.2 Design flow rate The raw water supply plan by phase and the flow rate to be pressurized by phase are shown in <Table 5.78> and <Table 5.79>, respectively. <Table 5.78> Raw water distribution plan by phase Classification Total Phase 1 Phase 2 Notes* m3/sec m3/sec % m3/sec m3/sec (m3/day) (m3/day) (m3/day) (m3/day) Banten 8.0 64.5% 3.15 4.85 2.3 (691,200) (272,160) (419,040) (198,720) West Java 0.2 1.6% 0.2 - (17,280) (17,280) West Jakarta 4.2 33.9% 3.2 1.0 1.0 (362,880) (276,480) (86,400) (86,400) Total 12.4 100.0% 6.55 5.85 3.3 (1,071,360) (565,920) (505,440) (285,120) * Upon completion of the Pasir Kopo dam, the expanded supply capacity of 3.3m3/sec is to be allocated for the second phase. ** Of the planned conveyance amount for the first phase (6.55 m3/sec), the construction will be done only for the amount to be supplied to the Serpong WTP for the first phase (4.6m3/sec). <Table 5.79> Pressurized flow rate plan by phase Classification m3/day m3/hr m3/min m3/sec notes Phase 1 565,920 23,580 393 6.55 Phase 2 505,440 21,060 351 5.85 Total 1,071,360 44,640 744 12.4 * Of the planned conveyance amount for the first phase (6.55 m3/sec), the construction will be done only for the amount to be supplied to the Serpong WTP for the first phase (4.6m3/sec). 5.11.3 Booster pump (1) Selection of the booster pump For a stable conveyance, it is necessary to select pumps that satisfy the planned quantity and water pressure and have excellent reliability and stability. The number of pumps, discharge flow rate, head, and rated power of the booster pump, which meet the planned conveyance amount for each phase are determined as described in <Table 5.80>. Technical requirements and cautions for selection of pumps and the determination process will be described later. 5-137

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia <Table 5.80> Selection of the booster pump Classification Main pump Regulating pump Rangkas Bitung system Type Double suction volute Double suction volute Double suction volute Flow rate pump pump pump 60m3/min (1.0m3/sec) 30m3/min (0.5m3/sec) 24m3/min (0.4m3/sec) Head 50m 50m 52m Rated power 700kW 350kW 320kW Phase1 7 (including 1 standby) 2 (including 1 standby) 2 (including 1 standby) No. Phase2 6 (including 1 standby) 2 (including 1 standby) - Total 13 (including 4 (including 2 standby) 2 (including 1 standby) 2standby) (2) Number of pumps, flowrate, and head 1) Review of master planning of Karian-Serpong conveyance system and water treatment plant PPP Before planning the number of pumps and flow rate, the 2014 report on master planning of Karian – Serpong conveyance system and water treatment plant PPP was reviewed to see if the existing plan is valid. According to the 2014 report, five high-pressure pumps (with the head of 86m and rated power of 500kW) are planned for conveying 6m3/sec to the Serpong and Parung Panjang WTPs and additional five low-pressure pumps (with the head of 47m and rated power of 750kW) are planned for conveying 2.3m3/s to the Solear WTP. Two units of pumps are separately planned for water conveyance to the Rangkas Bitung WTP (with the rated power of 375kW). The layout plan of the pumping station is described in <Figure 5.80>. <Figure 5.80> Pumping station layout plan (2014 PPP report) The pumping station layout plan proposed in the 2014 report is not a realizable plan for the following reasons. 5-138

Chapter 5. Conveyance System Planning ① with the existing facility and size, it is not possible to pressurize and convey 12.0m3/s, the amount needed for the second phase. The current total amount of 8.3m3/sec (excluding Rangkas Bitung System transmission amount of 0.4m3/sec), which combines 6.0m3/sec of the high head pump and 2.3m3/sec of the low head pump, falls short of the required amount for the second phase. Another pumping station needs to be constructed for phase 2 conveyance. ② the heads for the high (87m) <Figure 5.81> combined operating line of pump and low (47m) head pumps were (2014 PPP report) calculated too high, which will lead to excessive costs for operation/maintenance. Besides, there may be a need for a pressure reducing device to reduce an excessive residual head from the WTP inlet. ③ the flow rate of the high head pump is 1.5m3/sec (129,600m3/day), which is quite a large volume. However, with no regulating pump planned, it is difficult to address small changes in conveyance amount of the small-scale WTP connected by the branch pipeline. ④ once the waterworks start supplying water, it becomes closely related to the lives of people in the service area, which makes it difficult to shut off the water supply for a long period on account of maintenance or repair. This is why pipelines are interconnected to be united as one pipeline so that one pipeline can still be repaired while the other works in case of emergency. However, the difference in pump head between the high head and low head pumps planned in the 2014 report is so huge that it is impossible to operate the two pumps together since there is no overlapping point in the operating line of the pump as shown in <Figure 5.81>. Accordingly, a new plan is laid out for a stable conveyance and an efficient control of flow rate by correcting the flaws found in the 2014 report. Under the revised plan, the conveyance pipelines connecting the Serpong, Parung Panjang, Solear, and Maja WTPs will be a single water system with two pipelines arranged parallel to each other and interconnected. By doing so, during a routine check of one pipeline or when its water conveyance is suspended due to a leakage accident, the other pipeline can continue to supply water to avoid a water supply outage. 5-139

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia 2) Criteria for the number of pumps to be installed The number of pumps is decided by considering the amount of water to be conveyed by phase as well as backup pumps for potential breakdown or checkup. In general, the more discharge amount of the pump the higher its efficiency becomes, which in turn saves operating costs. Having more efficient pumps means requiring a small number of pump units, which helps to reduce initial investment amount including electric equipment and construction space. In this feasibility study, considering the initial load flow amount and flow control of a small- scale WTP’s (such as Maja and Parung Panjang WTPs) responsiveness against flow rate fluctuations, pumps are classified as the main pump, regulating pump, and Rangkas Bitung system pump and then their capacity and units are planned. Given that the initial low flow is needed, it is also necessary to consider other factors including but not limited to safety and economic feasibility. • changes in the conveyance amount should be considered from the initial year to the target year • if possible, pumps should have the identical capacity so that their consumables and spare parts are compatible • if there are more than four pumps, the reserve rate is set at 40 percent and less. • if flow rate fluctuates greatly with day/night, season, and year, a regulating pump or variable speed pump should be installed. • If pump head fluctuates greatly due to friction loss in the pipeline caused by flow rate changes between the initial and target year, consider replacing an impeller to change the pump head. <Table 5.81> Flow rate and number of booster pump Phase Conveyance Flow rate and number of pumps amount Phase 1 6.15m3/sec Operation (6.55m3/sec) 1.0m3/sec.unit x 6units + 0.5m3/sec.unit x 1unit = 6.5m3/sec Rangkas Bitung 0.4m3/sec Standby 1.0m3/sec.unit x 1unit + 0.5m3/sec.unit x 1unit = 1.5m3/sec Operation 0.40m3/sec. unit x 1 unit = 0.4m3/sec standby 0.40m3/sec. unit x 1 unit = 0.4m3/sec Phase2 5.85m3/sec Operation (5.85m3/sec) 1.0m3/sec. unit x 5 units+ 0.5m3/sec. unit x 1 unit = 5.5m3/sec Standby 1.0m3/sec. unit x 1 unit + 0.5m3/sec. unit x 1 unit = 1.5m3/sec 12.0m3/sec Operation 1.0m3/sec. unit x 11 units + 0.5m3/sec. unit x 2 units= 12m3/sec Rangkas Bitung Total 0.4m3/sec Standby (12.4m3/sec) 1.0m3/sec. unit x 2 units + 0.5m3/sec. unit x 2 units = 3m3/sec Operation 0.40m3/sec. unit x 1 units = 0.4m3/sec Standby 0.40m3/sec. unit x 1 units = 0.4m3/sec 5-140

Chapter 5. Conveyance System Planning 3) Pump head plan The pump head refers to a difference in water level indicating energy that can push the rated flow from the suction surface (intake tower L.W.L) to the discharge surface (receiving well H.W.L). The pump head is calculated by adding ① static suction head (generated by the <Figure 5.82> Head of the booster pump difference in head between suction surface and discharge surface), ② pressure head (generated by the difference in thermodynamic pressure), ③ velocity head by the velocity of the suction and discharge pipe, and ④ total loss of head in the entire pipeline according to design flow rate. Total Head = static suction head (Hs) + total static head (Hd) + flow velocity head (Hv) + pipe loss head (Hf) The head required for conveyance to water treatment plant is shown in <Table 5.82>. <Table 5.82> Required head by WTP Classification Serpong Rangkas Maja Solear Parung Panjang Bitung Branch at Branch at Overview conveyance conveyance conveyance Pressurize at Branch at pipeline STA18 Location pipeline booster conveyance pipeline STA30 pumping pipeline STA14 +582 +334 Planned daily STA74+925 station maximum water +253 Tangerang Bogor regency regency Parung Panjang supply South Receiving well Cisoka district district Tangerang Lebak regency elevation 3.6m3/sec 0.2m3/sec city Rangkas - 46.0m 58.3m Serpong Bitung district district 8.0m3/sec 0.4m3/sec 0.2m3/sec 50.8m 72.1m 46.0m Pipeline length 47,925m 8,560m 1,200m 4,750m 4,800m 5-141

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia Given that the low water level of the intake tower is 46.0m and the residual velocity head of the receiving well is 2.0m, the pump head is calculated as shown in <Table 5.83>. The head of the main and regulating pumps is set at 50m, and the head of Rangkas Bitung system pump is set at 52m. <Table 5.83> Pump head needed to convey water to water treatment plant Classification Serpong Rangkas Maja Solear Parung Bitung Panjang Total Phase1 50 52 31 22 48 head Phase2 30 52 24 31 32 4) Reserve rate of pump (standby) If the reserve rate of the pump is increased, the construction costs related to mechanical, civil, and architectural works will also go up. So, the reserve rate should be designed to have responsiveness to 60 to 100 percent of the transmission amount and to allow an economically feasible and stable operation of the pump equipment. In this feasibility study, water capacity of each water treatment plant, maintenance/operation during a pump break down, and emergency responses are considered to set the reserve rate within the range of 16.7% to 100% as shown in <Table 5.84>. Phase <Table 5.84> Reserve rate plan Reserve rate Pump Main pump 16.7 % Phase 1 Regulating pump 100 % Phase 2 Rangkas Bitung system pump 100 % Main pump 20 % 100 % Regulating pump As for a case study, the reserve rates of water service projects in metropolitan areas in Korea are shown in <Table 5.85>. 5-142

Chapter 5. Conveyance System Planning <Table 5.85> Reserve rate of water supply projects (excluding regulating pumps) Facility Capacity Quantity Reserve rate (%) Classification capacity per unit Capacity Unit (m3/day) (m3/day) Operation Standby standard standard Paldang intake station 6 2 34 33 1,200,000 201,600 7 3 43 43 5 2 42 40 phase 1 5 2 42 40 7 3 47 43 Paldang intake station 3 1 27 33 1,400,000 201,600 6 2 34 33 phase 1 6 2 37 33 Paldang intake station 3 1 32 33 1,330,000 278,000 8 2 25 25 6 2 50 33 phase 3 3 1 33 33 Paldang intake station 1,500,000 312,000 phase 4 Capital and Paldang intake station 2,100,000 330,768 phase 5 metro- politan Paldang intake station 1,207,500 330,768 phase6 water works Booster pumping station phase 5 1,353,000 228,528 (Incheon system) Booster pumping 747,000 138,960 station phase 5 (Pyeongtaek system) Booster pumping 704,000 228,528 station phase 6 (Incheon system) Intake pumping station 420,000 52,500 (domestic, industrial) Nakddong WTP transmission 200,000 50,000 river pumping station 70,000 (industrial) Gumi metropolitan 210,000 phase 1 intake station 5-143

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia (3) Review of pump types 1) Application scope and use by pump type <Table 5.86> Application scope and use by pump type Classification Head range Diameter range Main use Centrifugal φ40~2,000mm ∙ intake pump for waterworks, transmission pump 10~800m pump, booster pump, general industrial pump, (horizontal axis) small regular pump Mixed flow φ150~2,000mm ∙ intake pump for waterworks, storm sewer for pump 5~30m (mostly vertical sewerage, booster pump, drain pump for river, axis) general industrial pump Axial flow φ300~4,000mm ∙ intake pump for waterworks, industrial drain pump 1~6m (mostly vertical pump, drain pump for river and port, axis) industrial circulating pump 3) Pump efficiency curve <Figure 5.83> Efficiency curve by pump type Centrifugal pump Mixed flow pump Axial flow pump discharge amount-total head discharge amount-axial power discharge amount-efficiency 5-144

Chapter 5. Conveyance System Planning 3) Pump types and features <Table 5.87> Pump types and features Classification Centrifugal pump Mixed flow pump Axial flow pump • The Q-H curve tilts to the • The Q-H curve tilts to the • The Q-H curve sharply right, and its gradient gets closer to the mixed flow right, and its gradient is in tilts to the right, there is an pump when Q is greater than the design point the middle between inflection point at a pump • At Q = 0, the slope is slightly higher than the centrifugal and axial flow head higher than the turbine pump • Discharge amount against pumps. normal head change in pump head fluctuates greatly than • At Q = 0, the pump head is • The pump becomes other pump types Pump head increased to 200% of the unstable and makes noise (Q-H) design point at the normal head • Discharge amount against between 130 to 160% change in pump head is • Discharge amount against smaller than the centrifugal change in pump head is pump, greater than the smaller than the centrifugal axial pump and mixed flow pumps • When Q=0, P is the lowest • When Q = 0, the axial • When Q = 0, the axial • As the maximum efficiency power increases by 100 to power increases 180 to point changes gradually, 130% of the rated axial 220% of the rated axial the axial power increases power power Axial power with the flowrate • Its slope tilts to the right of the Q-P curve. the axial (Q-P) power becomes 115% at 130% of the rated pump head • Degree of curve of Q-η • Degree of curve of Q-η • Degree of curve of Q-η Efficiency curve is gradual. curve is between curve is drastic centrifugal and axial flow (Q-η) pumps Ns range 100 ~ 600 400 ~ 1,400 1,200 ~ 2,000 • Has high efficiency against • Being between centrifugal • Suitable for large-capacity, extensive variation of and axial flow pumps, it is low pump head (within flowrate and pump head suitable for medium pump 5m) (mid, high) head and flowrate • Its simple structure and • No need for a primo motor • The pump impeller is small size makes economic Pros to disassemble below the surface, helping sense. • As the main parts are avoid cavitation • Has large flowing area. installed in the pump • Takes up small space for can be used for storm station, it is easy to repair installation water and large-capacity • Number of revolutions can pumping be increased, faster than the centrifugal pump 5-145

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia <Table 5.87> Continued from the previous page Classification Centrifugal pump Mixed flow pump Axial flow pump • Large installation area • Main parts (impeller, • Not suitable for a place • Without pressing force in bearing) are installed where pump head changes the suction, automation underwater, so inspection • The movable vane type becomes complex as the is inconvenient requires complex impeller vacuum priming equipment • With the high bed height operating mechanism, so is needed of the ceiling crane, the maintenance is difficult Cons • There is limit on the building height increases • Shutoff operation is not suction head. if the suction • As the mechanical load is allowed level goes down, cavitation concentrated, load per unit • With the high bed height is more likely area increases of the ceiling crane, the • Underwater bearing building height increases requires heightened security • Suitable for mid to high • Flowrate against change in • Even if pump head pump head. higher pump head is not as changes greatly, there is efficiency than other fluctuant as centrifugal little change in flowrate pumps pump • If flowrate fluctuates, the • Range of use for flowrate • Efficiency change is axial force changes a lot. is broad. the axial force smaller than the axial • Efficiency change against Applicability decreases substantially pump but greater than flowrate change is greater below the design point, but centrifugal pump than centrifugal and mixed slightly increases above the • If high head pump flow pumps. design point necessary, by increasing • If flowrate change is great, • Little change in pump the stage of the impeller, the axial force is not as efficiency by flowrate an absorbing well facility fluctuant as that of the change compared to other is needed design point pumps Choice The centrifugal pump is an ideal pump type for medium to high pump head. 4) Centrifugal pump types <Table 5.88> Comparison of centrifugal pump types Classification Double suction centrifugal Single suction centrifugal Submerged centrifugal pump pump pump Shape 5-146

Chapter 5. Conveyance System Planning Classification Double suction centrifugal Single suction centrifugal Submerged centrifugal pump pump pump Feature • The fluctuation of • The fluctuation of • The fluctuation of discharge amount against discharge amount against discharge amount against pump head change is pump head change is the pump head change is the smaller than the turbine largest. smallest. pump, but larger than the • When Q = 0, the axial • When Q = 0, the axial underwater pump force is the smallest. force is greater than that of • When Q = 0, the axial • The axial force is large centrifugal pump. force is small. near the maximum • The axial force is the • The axial force is large efficiency point largest near the maximum near the maximum • There is less change in efficiency point efficiency point efficiency against flowrate • There is the least change in • There is little change in change than the double efficiency against flowrate efficiency against flowrate suction pump. change. change • It is easy to repair as main • It is easy to repair as main • The pumping station takes parts are installed in the parts are installed in the up small area as main parts pump station. pump station. are installed underwater. • The load distribution is • Simple structure • Excellent responsiveness even. there is no axial • Suitable for transmission against change in flowrate thrust. of small amount of flowrate and pump head • Capable of transmitting • Operation/maintenance is • Suitable for small/mid Pros mid/large amount of easy as it is installed on the amount of flowrate and flowrate ground. pump head • Operation/maintenance is • It is easy to adjust pumping • Safe against cavitation easy as it is installed on the amount. temporary shutoff • As pumps and motors are ground. operation is allowed. underwater, there is little • It is easy to adjust pumping noise and vibration. amount. temporary shutoff operation is allowed. • Requires large installation • Not capable of transmitting • Main parts (motor, area mid/large amount of impeller) are installed • Makes a lot of noise flowrate (only within underwater, so maintenance/repair is • If the required suction head 12m3/min) Cons is less than the available net • Same as double suction difficult. it is vulnerable to positive suction head, the centrifugal pump corrosion. vacuum priming equipment • Not capable of high pump is needed. head transmission. The maximum head is within 25m Choice ◉ Reason for • The double suction centrifugal pump is our final choice because it is suitable for choice transmission of mid/large amount of flowrate and high head pump, and it is easy to maintain and repair. 5-147

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia (4) Layout of pumps in the pumping station A wide range of factors are considered in laying out the pump chamber, which include an entrance for equipment, a place for assembly and disassembly, construction period, a passage for repair and checkup, a distribution board, piping, duct supports, drainage, wiring, inner drainage, ventilation, lighting, and crane for maintenance. Since multiple pumps are installed in the same place, it is critical to leave an appropriate distance between them. If pumps are not arranged with enough space, it could undermine the performance due to a vortex in the suction side or make the operation and disassembly inconvenient. If they are too distant from one another, it will be uneconomical. The size of an aisle around the equipment is planned between 1.0m and 1.5m. The layout of booster pumps is shown in <Figure 5.84>. <Figure 5.84> Booster pump layout Electric block valves are installed in the suction side of the pump while check valves, electric valves for flowrate control, and block valves for maintenance are installed in the discharge side of the pump. In addition, to make it easier to absorb expansion length and to install/disassemble block valves, telescopic pipes are installed in the suction and discharge side. The cross-section of the layout is shown in <Figure 5.85>. <Figure 5.85> Cross section of an installed booster pump 5-148

Chapter 5. Conveyance System Planning (5) Pump operation plan The purpose of controlling the pump operation is to safely and smoothly operate and stop pumps and to effectively respond to changes in demand of the water treatment plant. The control method includes a method in which the operator receives signals from a demander or measuring instrument and manually controls the operation, and a method in which the control device automatically controls the operation through signals from a measuring instrument. There are four methods for controlling the flow rate of the pump in operation: ① controlling the number of pump units in operation, ② controlling the operation time, ③ controlling the speed of revolution, and ④ controlling the opening and shutting of the valve. ③ and ④ can be applied to control pump head. The pump operation plan is shown in <Table 5.89>. <Table 5.89> Operation plan by pump Classification Flowrate load (100% ∼ 85%) Flowrate load (84% ∼ 60%) (Number of units + opening/shutting (Number of units + opening/shutting control + time control) control + time control) Main ●●●●●●○ 100% ∼ ●●●●○○○ 84% ∼ pump ●●●●●○○ 90% ●●●○○○○ 61% Phase1 Regulating ◐○ 89% ∼ ◐○ Below pump ◐○ 85% ◐○ 60% 100% ∼ 84% ∼ 90% 61% 89% ∼ Below 85% 60% Rangkas ●○ 100% ∼ ◐○ 84% ∼ Bitung 85% 60% pump ●●●●○○ ●●●○○○ 84% ∼ Main ●●●●●○ 100% ∼ 67% 90% ◐○ ◐○ Below pump ●●●●○○ 89% ∼ 66% Phase2 ◐○ 85% 84% ∼ 67% Regulating 100% ∼ 90% Below 66% pump ◐○ 89% ∼ 85% Note) ◐ : Time control + valve opening/shutting control / ● : Number of units control / ○ : Standby In the beginning of the facility operation, the demand is low, which leads to low friction loss and low required head. In this feasibility study, it is planned 60 percent to 84 percent of the initial flowrate load is operated by the low head impeller with 32mH. 5-149

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia Once the flowrate load reaches 85 percent, the low head impeller is replaced by the high head impeller with 50mH. Pressure reducing valves will be installed in the Maja and Solear branch pipelines. The Rangkas Bitung booster pump shows little change in pump head, so an independent pump is to be installed. If the planned flowrate for the first and second phases are reached, and after the second phase construction is completed, all pumps are to be operated by opening the interconnecting valves of the first and second phase pipelines and then to be replaced with the impeller with the 32mH. 5.11.4 Pump discharge valve Types of valves include a slow shut check valve + electric butterfly valve, a mixed check valve, and a hydrodynamic ball valve. For the booster pumping station of this project, the slow shut check valve + electric butterfly valve is selected since it is easy to install and operate and remains stable if water hammer occurs due to a power outage. <Table 5.90> Comparison of discharge valve types Classification Slow shut check valve + Mixed check valve Hydrodynamic ball valve electric B.F.V Structure + • It is a combination of an • With the surface • It is a valve with a hydraulic electric BFV and check separation of BFV applied, cylinder manipulator valve, with the swing it is a double function attached to the ball valve. type main disc and pump. It serves as the The manipulator controls auxiliary disc. When the discharge valve that is manually the speed of Overview pump stops, the main open/shut by the hydraulic opening/shutting. in case of disc is closed by the cylinder in normal times. it an emergency, it can be weight and the auxiliary also works as the check rapidly closed. disc is connected to the valve that is automatically dashpot to be slowly shut by weight in case of shut. emergency. Operating • Main/auxiliary disc is • Disc is open/shut by its • It is open/shut by the principle open/shut by water rotation by hydraulic rotation of a ball by pressure pressure hydraulic pressure Standard(mm) 80~900 400~1000 200~1650 Working 25 16 and less 4.5~20 pressure (kg/cm2) Installation Inexpensive (100%) Inexpensive (92%) Expensive (194%) cost 5-150

Chapter 5. Conveyance System Planning Classification Slow shut check valve + Mixed check valve Hydrodynamic ball valve electric B.F.V • The speed of opening / • It functions as two valves, • Surface separation is small. shutting can be adjusted so installation area and the speed of shutting / by dashpot. there are cost are reduced opening can be adjusted many installation cases • As hydraulic pressure unit • No crashing sound when • Simple and easy to is attached to the structure closed. operate of a regular butterfly valve, • No pressure loss. Low Pros • The length of valve it is operated by hydraulic electricity cost installation is long pressure. if power is cut • Surface separation between off, the circuit releases valves is small hydraulic pressure and the • Effective for high head valve is automatically pump closed by the weight attached. • If counterpressure is not • As hydraulic pressure • Expensive large, its leakage generator is additionally • As hydraulic pressure prevention is not good. in installed, more space is generator is additionally closed operation, it needed within the pumping installed, more space is Cons makes a lot of noise station needed within the pumping • Loss of head in the valve • During a power outage, station occurs the power supply for valve • Valves are hydraulically not needs to be ups, making closed the ups equipment bulky Choice ◉ Reason for • There have been many installation cases and installation cost is reasonable choice • Simple and easy control/operation 5.11.5 Water hammer safety device When pressure waves travel back and forth between the pumping station and the water treatment plant due to a sudden change in flow velocity in the conveyance pipeline, the pressure inside the pipe drops below the saturated vapor pressure and creates the vapor cavity, which eventually leads to the column separation. If the pressure inside the pipe is lower than the atmospheric pressure, collapse may occur in the pipeline. There is also a risk that the pipeline may be broken by the high pressure when the column separated by the vapor cavity gets reunited. When the water is flowing back into the pipe, pumps, valves, pipes, and other auxiliary facilities may be damaged as the pressure of the pipes in the premises of the pumping station may lead to flooding. Therefore, it is necessary to install a device to reduce or alleviate water hammer in the pipeline where water hammer is likely to occur. The water hammer relief device can be different depending on its main purpose: to prevent negative pressure (or column separation) from occurring or to reduce ascending pressure. 5-151

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia Several facilities are combined into the device when the water pipeline system is complex. Generally speaking, if negative pressure is prevented, the excessive pressure surge is avoided. Hence, it is fair to say that the best way to avoid water hammer is to prevent column separation. Commonly used water hammer prevention devices are shown in <Table 5.91>. <Table 5.91> Water hammer safety device Classification Air Chamber Air valve Slow shut Surge tank Surge check valve anticipating valve Main Pressure tank, Valve Valve Concrete Pressure tank, components compressor, structure compressor, automatic automatic control panel control panel Low initial cost Low initial cost Low initial cost Pros Has all safety and small and small Simple structure and small functions installation installation installation space space. space. Cons High initial Loud noise or Backflow may Restricted by Responds after cost, requires high ascending occur. not the ground water hammer pressure occurs suitable for level. not occurs, which many when the valve suitable for may damage components water hammer sewerage is closed prevention other equipment Prevention Fundamentally Can be None Fundamentally Requires against prevents effective, but prevents additional descending pressure drop column pressure drop control pressure by letting out separation may by letting out components to the fluid stored the fluid stored relieve some occur depending on pressure conditions Prevention Air vessel in the None None. Effective in Relieves some against chamber May do harm reducing ascending relieves ascending pressure by ascending ascending to other pressure pressure pressure equipment letting out the fluid inside Installation Can be installed Can be Installed in the Takes up large Installed in the area inside / outside. installed on the pipeline. takes space for pipeline. takes installation size up small space installation up small space top of the for installation for installation is adjustable pipeline, but the pipeline must not be buried. Maintenance Control with Not easy to Not easy to Needs to dress Difficult to automatic deal with when deal with when freeze and burst detect broken down broken down control panel breakdown Note) * Negative pressure in pipes exceeds the facility standard, causing water column separation. 5-152

Chapter 5. Conveyance System Planning According to the computational analysis of water hammer, the Karian – Serpong conveyance pipeline is prone to column separation when the pump in operation stops suddenly due to a power outage. The best device to prevent this is an air chamber. With the H.W.L. of (+)67.5 and the L.W.L. of (+)46.0, the capacity of the air chamber calculated by the computational analysis for the first and second phases is shown in <Table 5.92>. <Table 5.92> Air Chamber Capacity Classification Total volume Initial compressed Diameter of joint (capacity) (m3) air (m3) pipe (mm) Phase1 Karian - Serpong 15 3 350 15 3 200 H.W. L Karian - Rangkas Bitung Phase1 Karian - Serpong 20 4 350 20 6 300 L.W.L. Karian - Rangkas Bitung Phase2 Karian - Serpong 15 3 350 15 3 200 H.W.L. Karian - Rangkas Bitung Phase2 Karian - Serpong 20 4 350 20 6 300 L.W.L. Karian - Rangkas Bitung In normal operation, the compressed air in the air chamber is automatically controlled by the control panel to maintain an appropriate amount. If the amount of the initial compressed air is insufficient, pressure drop rate is too fast for the air chamber to serve its function. In contrast, if the initial air volume is too large, the compressed air is excessively expanded, which may lead to the air flowing into the pipe. The greater the initial air volume in the air chamber the smaller the pressure change rate of the compressed air, thus the amount of water travels between the air chamber and the pipeline increases more. As a result, the cycle of water hammer becomes long and the pressure change in the pipeline decreases. <Figure 5.86> shows the main parts of the compressor control that maintains the function of the air chamber. <Table 5.93> shows the transient characteristics of the compressed air calculated by the computational analysis according to the initial air volume in the air chamber. The initial air volume is to be the same as the values shown in the table and the rest of the control parts are properly determined by considering fluctuation of the surface of the water. To avoid frequent opening and shutting of the check valve, it needs to have enough weight and be cautious about vibration. 5-153

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia <Figure 5.86> Water level control of air chamber <Table 5.93> Transient characteristics of compressed air depending on the initial air volume in the air chamber Classification Initial Initial Max. Min. Duration Min. Max. Duration pressure pressure (sec) pressure (sec) volume (KPa) volume (KPa) volume (KPa) (m3) (m3) (m3) Phase1 Karian - 3.0 550.3 12.19 -11.1 25.70 3.00 579.8 0.00 H.W. L Serpong 3.0 569.9 11.66 31.3 53.53 3.00 599.5 0.00 4.0 457.5 15.99 -46.8 21.46 4.00 561.9 0.00 Phase1 Karian - 6.0 516 15.66 108.1 53.43 5.94 558.4 137.38 L.W.L. Rangkas Bitung 3.0 507 11.78 -11.9 25.66 3.00 536.5 0.60 3.0 568.1 11.64 31.7 53.70 3.00 597.6 6.09 Phase2 Karian - 4.0 497.3 15.51 -48.4 17.62 4.00 531.7 0.00 H.W.L. Serpong 6.0 514.7 15.63 109.0 53.50 5.93 558.6 137.35 Phase2 Karian - L.W.L. Rangkas Bitung Karian - Serpong Karian - Rangkas Bitung Karian - Serpong Karian - Rangkas Bitung 5-154

Chapter 5. Conveyance System Planning Except for fluctuation lasting a short time, the water level in the air chamber is automatically controlled so that it stays within the range of the maximum emergency water level and the minimum emergency water level. If the water level remains too high for a long time, it must be lowered by injecting the compressed air into the air chamber. Here, the air must be supplied directly from the air compressor. If the water level remains at the maximum emergency level for a long time, an alarm must sound. The system must be immediately stopped to investigate the causes. <Figure 5.87> shows the layout of the air chamber and its attached devices. <Figure 5.87> Air Chamber and its attached devices 5-155

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia 5.11.6 Lifting equipment To bring in/out and maintain mechanical equipment in the pumping station, crane equipment is planned. A 10-ton ceiling crane is selected as the lifting equipment to be installed in the booster pumping station after comparing crane types as shown in <Table 5.94>. <Table 5.94> Comparison of crane types Classification Overhead crane Suspension crane Monorail hoist Shape • The driving H-beam is fixed to • The driving I-beam is installed • The I-beam rail is installed the columns of the building, the in two lines, the crane is cling on the ceiling and the Operating driving rail is then installed on to the driving beam and Trolley Type Hoist for principle the beam. the crane is operated operated up, down, left, right, motor drive is installed on up, down, left, right, front, and front, and back sides. (6 points) the beam, and operated up back sides. (6 points) down left right sides. (4 points) • Hoist has a wide scope of • Hoist has a wide scope of • Only the transverse rail is operation, moving up, down, operation, moving up, down, installed on the ceiling and left, right, front, and back sides. left, right, front, and back the hoist is installed in the (6 points). Capable of sides. (6 points). Capable of rail, thus the building height transporting the whole chamber transporting the whole is low • Building with large capacity and chamber • Production cost is relatively Pros width • Can be installed in a narrow low • Hoist is stably installed in the space by taking advantage of upper side of girder, so it does hoisting height not wobble and makes the • The driving rail is fixed on the operation stable ceiling and the hoist is installed • With a maintenance sidewalk, in the rail, thus it does not take maintenance and checkup is up much space in the ceiling, easy lowering the building height • Higher material costs (needed to • As it is hung from the ceiling, • Can be operated only in a install bracket and H-beam) the greater strength of the place where the rail • More spacing is needed between building the higher the installed the ceiling of the building and construction cost. • Extra equipment is needed Cons the upper side of the driving rail • Needs extra caution for for checkup and requires greater story height. installation as it is installed in maintenance. the bottom of Girder • Hard to lift a heavy weight • Extra equipment is needed for checkup and maintenance Choice ● Reason for • Overhead crane is selected because it is capable of lifting large capacity pump and valve choice 5-156

Chapter 5. Conveyance System Planning 5.11.7 List of main equipment <Table 5.95> List of main equipment No. Equipment name Standard and specification Unit Power Control (standby) (kW) panel MP booster pumping station (phase 1) Type : electric butterfly valve MP-101 (horizontal, adjustable opening) integral Main suction valve 1 5.5 MP-102 (A~G) Standard : 2000A × 16.0kgf/cm² type integral MP-103 Material : GCD450, metal sheet 7(1) 3.7 (A~G) Type : electric block valve (On/Off type) type MP-104 Main booster pump 7(1) 700 MOP (A~G) Standard : 800A × 16.0kgf/cm² 7(1) - MP-105 suction valve integral (A~G) Material : GCD450 7(1) 3.7 MP-106 type (A~G) Type : double suction volute pump integral MP-107 (mechanical seal) 7(1) 5.5 (A/B) Min booster pump Standard : 60m³/min, 6600V type MP-108 integral (A/B) Pump head : 50mH 2(1) 3.7 MP-109 Including onsite control panel type (A/B) 2(1) 350 MOP Type : slow shut check valve MP-110 Main booster pump 2(1) - (A/B) integral Standard : 700A × 20.0kgf/cm² check valve 2(1) 2.2 type Material : GCD450 Type : electric butterfly valve Main booster pump (horizontal, adjustable opening) discharge valve Standard : 700A × 20.0kgf/cm² Material : GCD450, metal sheet Type : electric block valve (On/Off type) Main booster pump Standard : 700A×20.0kgf/cm² maintenance valve Material : GCD450 Type : electric block valve (On/Off type) Regulating booster Standard : 700A×16.0kgf/cm² pump suction valve Material : GCD450 Type : double suction volute pump (mechanical seal) Regulating booster Flowrate : 30m³/min,6600V pump Pump head : 50mH Including onsite control panel Type : slow shut check valve Regulating booster Standard : 600A × 20.0kgf/cm² pump check valve Material : GCD450 Regulating booster Type : electric butterfly valve pump discharge (horizontal, adjustable opening) valve Standard : 600A × 20.0kgf/cm² Material : GCD450, metal sheet 5-157

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia <Table 5.95> Continued from the previous page No. Equipment name Standard and specification Unit Power Control MP-109 (standby) (kW) panel (A/B) Regulating booster Type : slow shut check valve 2(1) - integral MP-110 pump check valve Standard :600A × 20.0kgf/cm² type (A/B) Material : GCD450 integral MP-111 Type : electric BFV type (A/B) MP-112 Regulating booster (horizontal, adjustable opening) 2(1) 2.2 integral (A/B) type pump discharge valve Standard : 600A × 20.0kgf/cm² MP-113 MOP (A/B) Material : GCD450, metal sheet integral MP-114 Regulating booster Type : electric block valve (On/Off type) type (A/B) pump maintenance Standard : 600A × 20.0kgf/cm² 2(1) 5.5 integral MP-115 type (A/B) valve Material : GCD450 integral MP-116 Rangkas Bitung Type : electric block valve (On/Off type) type (A/B) booster pump suction Standard : 700A × 16.0kgf/cm² 2(1) 3.7 MOP MP-117 valve Material : GCD450 LOP MP-118 Type : double suction volute pump LOP MP-119 (A~D) Rangkas Bitung (mechanical seal) 2(1) 320 MOP booster pump Flowrate : 24m³/min, 6600V MP-120 Pump head : 52mH MOP (A~F) Including onsite control panel MP-121 Rangkas Bitung Type : slow shut check valve MP-122 booster pump check Standard : 600A×20.0kgf/cm² 2(1) - valve Material : GCD450 Rangkas Bitung Type : electric BFV 2(1) 2.2 booster pump (horizontal, adjustable opening) discharge valve Standard : 600A × 20.0kgf/cm², Material : GCD450, metal sheet Rangkas Bitung Type : electric block valve (On/Off type) booster pump Standard : 600A×20.0kgf/cm² 2(1) 5.5 maintenance valve Material : GCD450 Type : electric BFV Main discharge valve (horizontal, adjustable opening) 1 7.5 Standard : 2000A × 20kgf/cm², Material : GCD450, metal sheet Crane for equipment Type : double girder crane 1 9/0.75/ entry Standard : 10-ton, span: 10m 1.5×2 Driving range : 100m, lifting height: 10m Type : under water motor pump Emergency drain (automatic removeable) 4 3.7 pump Flowrate : 1.0m³/min Pump head : 15mH Type : under water motor pump Drain pump Flowrate : 0.15m³/min 6(3) 1.5 Pump head : 15mH Water hammer Type : vertical cylinder pressure tank 0.2 3.7 x protection equipment Material : SB410 equivalent or above 1 unit 2(1) (Karian-Serpong Capacity : 20.0m³ × 1 unit route) Air compressor : 200ℓ/min × 9.9kgf/cm2 x 2 Water hammer type : vertical cylinder pressure tank 1 unit 0.2 3.7 x protection equipment material : SB410equivalent or above 2(1) (Karian-Rangkas capacity : 20.0m³ × 1unit Bitung route) air compressor : 200ℓ/min × 9. 9kgf/cm2 x 2 5-158

Chapter 5. Conveyance System Planning <Table 5.95> Continued from the previous page No. Equipment name Standard and specification Unit Power Control (standby) (kW) panel 2MP booster pumping station (phase 2) integral Type : electric BFV (adjustable opening) 1 5.5 2MP-101 Main suction valve Standard : 2000A × 16.0kgf/cm², GCD450 type integral (horizontal) metal sheet 6(1) 3.7 2MP-102 Main booster pump Type : electric block valve (On/Off type) type (A~F) suction valve Standard : 900A × 16.0kgf/cm², GCD450 6(1) 700 MOP Type : double suction volute pump 6(1) - integral (mechanical seal) 2MP-103 6(1) 3.7 type Main booster pump Flowrate : 60m³/min, 6600V (A~F) integral 6(1) 5.5 Pump head : 50mH type Including onsite control panel integral 2(1) 3.7 2MP-104 Main booster pump Type : slow shut check valve type (A~F) check valve Standard : 800A × 20.0kgf/cm², GCD450 2(1) 350 MOP Type : electric BFV (adjustable opening) 2MP-105 Main booster pump 2(1) - integral Standard : 800A × 20.0kgf/cm², GCD450 (A~F) discharge valve 2(1) 2.2 type (horizontal) metal sheet integral 2MP-106 Main booster pump Type : electric block valve (On/Off type) 2(1) 5.5 (A~F) maintenance valve Standard : 800A × 20.0kgf/cm², GCD450 type integral 2MP-107 Regulating booster Type : electric block valve (On/Off type) 1 7.5 (A/B) pump suction valve Standard : 800A × 16.0kgf/cm², GCD450 type integral Type : double suction volute pump 1 7.5 2MP-108 Regulating booster (mechanical seal) type 9/0.75/ (A/B) pump Flowrate : 30m³/min, 6600V 1 MOP 1.5×2 Pump head : 50mH Including onsite control panel 2MP-109 Regulating booster Type : slow shut check valve (A/B) pump check valve Standard : 700A × 20.0kgf/cm², GCD450 2MP-110 Regulating booster Type : electric BFV (adjustable opening) (A/B) pump discharge Standard : 700A × 20.0kgf/cm², GCD450 valve (horizontal) metal sheet 2MP-111 Regulating booster Type : electric block valve (On/Off type) (A/B) pump maintenance Standard : 700A × 20.0kgf/cm², GCD450 valve 2MP-112 Main discharge Type : electric BFV (adjustable opening) valve Standard : 2000A × 20kgf/cm², GCD450 (horizontal) metal sheet Type : electric BFV (adjustable opening) 2MP-113 By-pass valve Standard : 2000A × 20kgf/cm², GCD450 (horizontal) metal sheet Crane for equipment Type : double girder crane 2MP-114 entry Standard : 10-ton, span: 10m Driving range : 100m, lifting height: 10m 5-159

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia 5.12 Electrical and Instrumental & Control Works 5.12.1 Electric equipment (1) Design overview This Karian – Serpong conveyance system project is to provide a stable supply of raw water to water treatment plants in the service area by installing the booster pumping station and the flowmeter station. To ensure a stable and reliable supply of power, electric equipment is to be installed. (2) Work scope <Table 5.96> shows the detailed supply scope for electric equipment to be installed in the booster pumping station and flowmeter station. <Table 5.96> Supply scope of electric equipment Classification No. Supply scope Booster ⦁ Electricity distribution facility, power control facility, standby Pumping Station 1 electric power source, lighting and electric line equipment, ground connection and lightning protection facility Flowmeter station ⦁ Power lead-in (medium voltage) and other electric works 4 ⦁ Power control facility (TM/TC embedded) ⦁ Power lead-in (low voltage) and other electric works (3) power-supply related site investigation Through a survey on the current state of the distribution line and substations in Indonesia, the most possible economical and stable power lead-in is designed. 1) Distribution line investigation According to the survey, about 5km away from the booster pumping station is a two-line distribution electric line with 3Φ 20kV coming from the Rangkas substation. Whether it is possible to use this substation and the electric line has been confirmed after a visit to the PNL. The current state of the distribution electric line is shown in <Figure 5.88>. <Figure 5.88> Current state of distribution lines Distribution line: 3Φ 20kV Electric pole No. : P.MRBG 101 GI ONA 5-160

Chapter 5. Conveyance System Planning 2) Consultation with PNL We wrote an official document after paying a visit to Indonesia’s SDA. Then we sent the document to the headquarters and the local office (Banten province) of the PNL to discuss ways to supply power. <Figure 5.89> shows our consultants discussing power lead-in with the Banten office of the PNL. <Figure 5.89> Consultation on ways to supply power BANTEN local office Face-to-face meeting 3) Power supply plan ① Current state of substations with incoming power In the vicinity are Rangkas Substation and Rangkas New Substation, which can <Figure 5.90> supply power to the booster pumping Substation capable of power supply station. <Figure 5.90> shows the current state of the substations capable of power lead-in. ② Commercial power supply The commercial power supply will be supplied from Rangkas New Substation by installing an additional 20kV- distribution line. The substation is about 10km away from the booster pumping station. ③ Standby power source Although Rangkas substation is about 10km away from the booster pumping station, the substation will be used as a standby power source in case of emergency. 5-161

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia ④ Connection Cost It is estimated to cost 480 million KRW to construct an additional distribution line connecting from the Rangkas New substation which supplies commercial power to the Booster Pumping Station. The construction cost is to be paid to the PNL, which is in charge of implementing the construction. ⑤ Review of power lead-in method If power is supplied from one substation, the regular charge is applied. The premium charge is applied if two substation supply power. Premium charge is six times higher than regular charge, which means higher maintenance cost. This time, power is to be supplied from one substation and whether to have power supplied from two substations will be reviewed in the next stage of design. 4) Power supply system The power supply system from the Rangkas New substation to the Booster Pumping Station is shown in <Figure 5.91>. <Figure 5.91> Power lead-in system 5) Standard voltage and capacity The standard frequency used in Indonesia is 50hz and its rated voltage is shown as in <Table 5.97>. 5-162

Chapter 5. Conveyance System Planning <Table 5.97> Rated voltage in Indonesia Classification Voltage Amount of power used Remarks High Voltage, HV 150kV more than 30MVA Medium Voltage, MV 25kV, 30kV, 70kV 500kVA ∼30MVA Booster pumping station Low Voltage, LV 220/380V less than 500kVA Flowmeter station 6) Site for switchgear In order for the booster pumping station to receive power, a 12m×6m land inside the booster pumping station needs to be provided to the PNL. Then, the PNL will be in direct charge of installing a building and switchgear. 7) Power lead-in plan To supply power to the booster pumping station, 20kV will be supplied from the switchgear installed on the premises by the PNL. The main transformer is to depressurize it to 6.6kV and then the secondary transformer is to depressurize 6.6kV to 400V/230V. To supply power to the flowmeter station, 230V will be supplied from the electric pole installed by the PNL in the vicinity of the site. 8) Review of a 2014 report There have been neither investigation nor discussion about the possible power supply, our investigation and consultation results are included in this report. (4) Design criteria Applicable laws and regulation in designing and constructing this project are as follows: • KS : Korean Industrial Standard • IEC : International Electrotechnical Commission • NEC : National Electrical Code U.S.A. • Indonesian Standards on Electric Design and Power Supply (5) Equipment plan 1) Demand power Since load equipment are categorized into the ordinary load, momentary load, and intermittent load, a demand factor is calculated by considering characteristics of each load. • Intermittent operation load : 10% • Momentary operation load : 60% • Ordinary operation load : 70% • Load that needs speed control : 70% of demand factor 5-163

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia 2) Installation of transformer Voltage and capacity of the transformer by phase are shown in <Table 5.98>. <Table 5.98> voltage and capacity of transformer by phase Classification phase 1 phase 2 Voltage 20/6.6kV 20/6.6kV Capacity 7,500kVA 5,000kVA 3) Installation of emergency electric generator The booster pump needs to be in continuous operation in case of a commercial power outage. Therefore, a number of requirements for the facility to be operated more than 50 percent of its capacity are factored in. ① Power load of emergency electric generator The power load of emergency electric generators is shown in <Table 5.99>. <Table 5.99> Power load of emergency generator Classification Pump Booster pump Power load of emergency generator No. Power(kW/unit) No. Power(kW) Main booster pump 7(1) 700 4(1) 2,100 Regulating booster 2(1) 350 2(1) 350 pump Phase 1 Rangkas Bitung 2(1) 320 2(1) 320 booster pump Low pressure load 300 Phase 2 Subtotal 6(1) 700 3,070 Main booster pump 2(1) 350 3(1) 1,400 Regulating booster 2(1) 350 pump Subtotal 1,750 Total 4,820 ② Capacity of emergency electric generator In case of a commercial power outage, an emergency electric generator is to be operated more than 50 percent of the capacity of the pump facility. <Table 5.100> shows the calculated capacity and number of emergency electric generators. 5-164

Chapter 5. Conveyance System Planning <Table 5.100> Capacity and number of emergency electric generator Phase Voltage and Generator load Notes frequency No. Power (kW) Total Phase 1 6.6kV, 50Hz 3 1,360 4,080 Emergency operation Phase 2 6.6kV, 50Hz 3 1,000 3,000 Emergency operation Total 7,080 4) Electricity distribution facility The power distribution board and motor control panel will be designed as an indoor closed cubicle type in digital form. The onsite control panel will be installed near the facility so that an operator can monitor and operate facilities manually. 5) Lighting equipment Light sources, types and sizes of indoor/outdoor lighting equipment, and their locations are carefully selected by factoring in the quality, quantity and direction of light that will best serve the intended purpose of each room. All materials are highly efficient to save energy. The recommended roughness is shown in <Table 5.101>. <Table 5.101> Criteria of illumination intensity Main room Design Light source Lighting fixture illuminance [Lx] Main control room 500 LED Encased flat type Office 400 LED Encased flat type Electric room, 300 dynamo-room LED Encased flat type, wall floodlight Machine room 200 LED Wall floodlight Security light 11 LED 6) Electric line equipment Electrical outlets and power packs will be installed in the main control room, office, and machine room for effective operation and maintenance of equipment. 7) Grounding equipment Integrated grounding and structure grounding methods are adopted to ensure the equipotentiality of all equipment – power, measuring, communication, and lightning protection equipment. The grounding resistance is planned at the recommended level by IEEE and NEC, or 5[Ω] and less. 5-165

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia 8) Lightning protection equipment Lightning rods and horizontal conductors are designed for lightning protection equipment using a rotational sphere, to prevent property damage and casualties. (5) List of electric equipment <Table 5.102> shows the list of the electric equipment. Classification <Table 5.102> Electric equipment list No. Notes Equipment 1 unit 1 unit ⦁ MV Power Incoming 1 unit Booster ⦁ Electricity distribution and power control equipment 1 unit Pumping - Middle Voltage Panel 1 unit Station - Transformer 1 unit - Low Voltage Panel 1 unit - Motor Control Center 1 unit - Local Control Panel 1 unit 1 unit ⦁ Standby power source - Emergency Generator ⦁ Lighting and electric line equipment ⦁ Grounding and lightning protection equipment ⦁ Other electric works ⦁ LV Power Incoming Flowmeter ⦁ Power control equipment room - Motor Control Center, TM/TC embedded) (all 4 rooms) ⦁ Grounding equipment ⦁ Other electric works (6) Power distribution dingle line diagram <Figure 5.92> shows the power distribution dingle line diagram. 5-166

Chapter 5. Conveyance System Planning <Figure 5.92> Power substation dingle line diagram 5-167

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia 5.12.2 Instrumentation and control equipment (1) Design overview 1) Basic direction An integrated operation room is to be installed in the booster pumping station for a stable and equal supply of raw water from the Karian dam to five water treatment plants (main line – Serpong WTP, branch line – four WTPs). To measure changing flow rates controlled by the regulating valves (work scope of a PPP project provider) at each water treatment plant, the integrated monitoring and control system, which is capable of operating the pumps and monitoring the system by receiving values indicated on the flowmeters installed in the main and branch conveyance lines as well as the Karian dam levels. 2) Design scope The scope of instrumentation control equipment to be installed in the booster pumping station and flowmeter room is shown in <Table 5.103>. <Table 5.103> scope of instrumentation/control equipment Classification No. Scope Intake tower ⦁ Improvement of the remote surveillance control equipment (PLC), 1 and field measurement instruments ⦁ Instrumentation and control works Booster ⦁ Image surveillance devices, monitoring control equipment Pumping Station 1 (PLC+PC), field measurement instruments, CCTV equipment ⦁ Instrumentation and control works Flowmeter ⦁ Remote surveillance control equipment and field measurement room 4 instruments ⦁ Instrumentation and control works (2) Current state of communication service and communication plan A reliable and stable communication method is designed by investigating the local communication system. 1) Current state of communication service In Indonesia, telecommunications service providers include a state-owned Telkom, Telcomsel, Indosat, Bakrie Telecom, and XL Axiata. Telcomsel, which is an affiliate organization of Telkom, is currently providing wired and wireless network service throughout the entire country. 5-168

Chapter 5. Conveyance System Planning 2) Communication plan The Booster Pumping Station and Flow meter chamber will be installed in the outskirts of the city. Therefore, a wireless communication method is planned, which will save extra construction costs for wire communication lines. 3) Wireless communication network plan It is planned the booster pumping station and flow meter chambers will use a wireless communication network provided by a telecommunication service company. The onsite remote monitoring system called TM/TC #S collects data from each flow meter chamber and transmits it to the booster pumping station via its wireless modem. Then, the booster pumping station receives data via its wireless modem and transmits it to the central remote monitoring system called TM/TC #M so that the operator’s HMI can control the overall data transmission. <Figure 5.93> Power lead-in system (3) Design criteria Applicable laws and regulation in designing and constructing this project are as follows: • KS : Korean Industrial Standard • IEC : International Electrotechnical Commission • NEC : National Electrical Code (U.S.A) • Indonesian Standards on Information and Communications Design Criteria and Design and Telecommunication Service Provision (4) Equipment plan 1) Image monitoring equipment An image monitoring panel with a large screen is to be installed in the main control room for an effective surveillance of equipment in the booster pumping station and flowmeter chamber. 2) Monitoring and control equipment The monitoring and control equipment is to be set up with an open PLC+PC System to prepare for the future expansion. Fail Safe & Fail Over, Open Architecture, and interactive HMI Software are installed for an easier operation. 5-169

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia The system is planned as a centralized monitoring and control system, which is capable of overall surveillance and suitable for a small-scale treatment facility. The system is programmed to be operated by the PLC installed inside the TM/TC with respect to the power load in the pumps and valves. It is also designed for a centralized monitoring and control with data transmitted through a network facility. Main functions of the monitoring and control equipment are shown in <Figure 5.94>. <Figure 5.94> functions of monitoring and control equipment Monitoring function Control function Data collecting and logging function • Monitor process status • Control Loop, Sequence • Collect and search data • Monitor alerts, measured • Control Advance • Logging and reporting valves Operation/maintenance Engineering function function Self-diagnosis function • Fail Over function • Database server function • Programming, downloading, • System status and • Emergency alert transmission backup failure/fault diagnosis (SMS) • Change Setting of Parameter 3) Metering/measurement equipment The minimum number of measurement equipment with excellent durability and metering precision is to be installed for an effective management of water quality, efficient operation of energy, and optimal operation control. An ultrasonic level meter is to be installed in the intake tower to ensure the water level monitoring and the interlocked operation of the booster pump. Ultrasonic flowmeters are to be installed at the branch point of each water treatment plant as well as at the inlet and outlet of the booster pumping station so that flowrates can be monitored at each point. Pressure meters are to be installed in the discharge area of the pump to check if there is any problem in the pipeline by monitoring the pressure of the pipe. 5-170

Chapter 5. Conveyance System Planning <Table 5.104> and <Figure 5.95> show the installation and operation plan of measurement equipment. <Table 5.104> Installation and operation of measurement equipment Item Type Diameter No. Installation location and operation Notes Water Ultrasonic - Intake tower(A) phase1 level - 1 to stop the operation of the booster pump gauge phase1 during low water levels phase2 Pressure phase1 Diaphragm 2 Booster pump discharge pipeline(B) phase1 to monitor discharge pressure of the booster phase2 gauge 1 pump phase1 Ultrasonic 2,200 Booster pumping station inlet (1) phase1 2 phase2 phase1 to monitor incoming flowrate phase2 phase1 Ultrasonic 2,000 1 Main booster pump outlet (2) phase2 1 to monitor outflowing flowrate phase1 Ultrasonic 600 Rangkas Bitung booster pump rear side (3) 1 to monitor outflow and control the operation phase2 Ultrasonic 350 1,350 of the booster pump Flowmeter Ultrasonic 1 Maja branch point (4) to monitor the supply amount of raw water Ultrasonic 600 1 and to control the number of booster pumps Ultrasonic 2,000 1 Solear branch point (5) Ultrasonic 1,800 to monitor the supply amount of raw water 1 and to control the number of booster pumps 1 Parung Panjang branch point (6) to monitor the supply amount of raw water 1 and to control the number of booster pumps Serpong WTP phase 1 branch point (7) 1 to monitor the supply amount of raw water and to control the number of booster pumps Serpong WTP phase 2 branch point (8) 1 to monitor the supply amount of raw water and to control the number of booster pumps 5-171

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia <Figure 5.95> Installation location and operation of measurement equipment 5-172

Chapter 5. Conveyance System Planning 4) CCTV equipment CCTV equipment that supports high resolution is selected for proper access control and monitoring. With a remote-control rotating camera installed, the equipment allows a monitoring and control from the main control room. (5) List of instrumentation and control equipment The list of instrumentation and control equipment to be installed is shown in <Table 5.105>. <Table 5.105> List of instrumentation and control equipment Classification Equipment Quantity Notes ⦁ Monitoring control system 1 unit - Upbuild the existing TM/TC (PLC) Intake tower ⦁ Metering equipment 1 unit - Level Meter 1 unit 1 unit ⦁ Instrumentation control works 1 unit ⦁ Image monitoring equipment 1 unit 1 unit Booster ⦁ Monitoring control system Pumping - Operator's Workstation Station - TM/TC (PLC) - UPS - Network facility ⦁ Metering equipment - Pressure Meter - Flow Meter ⦁ CCTV equipment Flowmeter Instrumentation control works 1 unit chamber 1 unit ⦁ Monitoring control system (all 4 - TM/TC (PLC) 1 unit chambers) - UPS 1 unit ⦁ Metering equipment - Flow Meter ⦁ Instrumentation control works 5-173

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia (6) Configuration diagram of the monitoring and control system The configuration diagram of the monitoring and control system is shown in <Figure 5.96>. <Figure 5.96> Configuration diagram of the monitoring and control system 5-174

Chapter 6. Project execution plan Chapter 6. PROJECT EXECUTION PLAN 6.1 Overview The total project cost is made up of direct cost including construction cost, commissioning and training cost, and consulting service fees and indirect cost including physical and price contingency, project management cost, and loan service charges. The construction cost is calculated based on an estimated quantity of conveyance system facilities. A part of the construction cost may increase or decrease depending on the results of more detailed investigations on geology, which will be conducted when developing a working design. The construction cost is also subject to change depending on cost estimation criteria or terms and conditions agreed upon by suppliers of steel pipes or pumps. Considering all possible changes in costs, contingency funds are allocated to prepare against inflation or quantity increase. The composition of the total project cost is shown as in <Figure 6.1>. <Figure 6.1> Composition of total project cost <GOI> <EDPF> Project Direct cost Direct cost construction cost Commissioning and training cost Consulting fee Indirect cost Contingency Project management cost Land acquisition and compensation cost Taxes and duties Service charge 6-1

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia In this feasibility study, technical aspects of this project are analyzed with consideration for the first and second phase projects, but the project cost is estimated only for the first phase, which is the project scope to be funded by the EDPF. Accordingly, economic and financial aspects are analyzed in terms of the first phase. The project cost estimation for the second phase project is included as an annex. ● Direct construction cost involves costs related to all materials and equipment needed for main and branch conveyance pipelines, a booster pumping station, other pumps and valves, power supply facilities, integrated monitoring and control system. ● Commissioning and training cost involves the cost for a three-month commissioning test of the conveyance system after completion of construction, an integrated commissioning test of the integrated control system, and education and training expenses. ● Consulting fees include labor cost for consultants (m/m) assigned to working design, bidding preparation, and construction supervision as well as direct expenses such as overhead expenses, engineering fees, and field investigation expenses. ● Contingency cost is divided into physical and price contingency. Physical contingency is set at 5 percent of the direct cost and price contingency will be set by taking national inflation rates into consideration. ● Project management cost is set at 2 percent of the direct construction cost. It is the required expense for the project execution agency to implement the project, which includes labor cost, living expenses, office rentals, transportation and telecommunication fees for an organization set up for the management of the project. (refer to chapter 7.4 project implementation system and related organizations) ● Land acquisition and resettlement compensation costs are composed of land acquisition cost, resettlement compensation cost, crops compensation cost, and sales compensation cost entailed by construction. ● Taxes such as VAT and duties are included in the total project cost. ● Service charge for EDPF (Economic Development Promotion Fund) will be determined after consultations, so it is not included in this project cost. 6.2 Direct Cost 6.2.1 Direct construction cost To calculate the construction cost, construction type is classified into works of a booster pumping station, main and branch conveyance pipelines. Work for a booster pumping station is categorized into civil, architectural, mechanical, and electrical/metering construction. To establish an integrated operation and management system, instrumentation work of an intake tower and electrical/metering construction like flowmeters of the pipelines are included in the electrical/instrumentation construction of the booster pumping station. As for the classification of materials and equipment, those produced in Indonesia are 6-2

Chapter 6. Project execution plan denominated in local currency and those produced in Korea are denominated in foreign currency. Civil and architectural works, which utilize local materials and workforce are planned in local currency. Depending on the level of difficulty of construction work, construction with the high level of difficulty is planned in foreign currency (such as Korean) that can meet the required quality level whereas construction with the low level of difficulty is planned in local currency. In particular, steel pipes, major material for conveyance pipelines, are required to meet a certain level of quality and quality management in order for them to maintain their design life of more than 50 years. However, the results of our investigation revealed that such materials produced in Indonesia fall short of reliable quality, hence, they are classified into foreign currency. If confirmed in the working design stage that steel pipes locally produced satisfy strict quality standards, it is possible to change steel pipes in foreign currency into ones in local currency. Data used in calculating the unit construction cost is shown as in <Table 6.1>. In case of a work classification that has no local unit price, the local unit price is calculated by calculating the average unit price rate of work types in Korea, comparable to those in Indonesia, and then applying the local average unit price rate to the domestic (Korean) unit price. <Table 6.1> Data reviewed for calculation of unit construction cost Material Year Written by Reviewed data Master Planning and 2011. 09 - Korea Rural Community Evaluation Feasibility Study of Karian Corporation of Project Dam ~ Serpong Water - KyongDong Engineering Cost Conveyance & Supply - SinWoo Engineering - Hankook Engineering Project Cost System Consultant Estimation Final Report for the Basic 2015. 12 - Korea Rural Community Real Design and PPP Plan on Aug. 2017 Corporation Estimate Karian - Serpong Water Conveyance and Supply - Dohwa Engineering Cost - Dasan Accounting Firm Materials System in Indonesia - Hankook Engineering produced in Finalization of the Design of Consultant Korea Karian - Serpong KWARSA HEXAGON Conveyance System Korea Price Research Center Consumer price index 2018. 05 The local unit price is calculated by applying the unit price from a 2014 PPP report (Final Report for the Basic Design and PPP Plan on Karian - Serpong Water Conveyance and 6-3

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia Supply System in Indonesia) and then reflecting an inflation rate. The estimated construction cost by work classification is compared with the construction cost applied in a 2017 report (on Finalization of the Design of Karian - Serpong Conveyance System) by KWARSA HEXAGON to review the adequacy. As for the steel pipe, one of the key materials in the pipeline construction, the prices of three types of steel pipe are compared – steel pipes produced and coated with asphalt enamel in Indonesia; steel pipes produced and coated with the fusion bonded coating method for better quality; and steel pipes produced in Korea. The surveyed unit prices are shown as in <Table 6.2>. <Table 6.2> Surveyed unit price of steel pipe (unit: currency/m) Diameter Pipe wall Surveyed unit price of steel pipe Surveyed unit price of steel pipe (mm) thickness produced in Korea produced in Indonesia (Asphalt Coating) (mm) (Fusion Bonded Coating) IDR USD KRW USD D2,200 16 2,397,820 2,220.2 16,692,724 1,236.50 D2,000 15 2,012,190 1,863.1 14,118,638 1,045.83 D1,800 13 1,648,250 1,526.2 11,476,713 850.13 D1,350 10 990,000 916.7 10,418,925 771.77 D600 6 343,830 318.4 2,488,613 184.34 D350 6 200,560 185.7 1,450,488 107.44 Note) 1. The unit price of steel pipes produced in Korea is calculated based on the unit price of 3-layered fusion bonded polyethylene coated steel (inner side: polyurea) notified by Korea Price Research Center (May 2018). The unit price of steel pipes produced in Indonesia is a quoted unit price by Indonesian steel pipe maker K. 2. As for steel pipes with a diameter larger than 1,200mm, those supplied by Indonesian steel pipe maker K are coated with asphalt enamel, which deemed difficult to last 50 years of the design life, so the unit price of steel pipes produced in Korea is applied in estimation of direct construction cost. 3. Applied exchange rate 1 USD = 13,500 IDR, 1 USD = 1,080 KRW, 1 KRW = 12.5 IDR As for valves to be used for operation, maintenance, and safety of the pump station and conveyance pipelines, the unit price of valves produced in Korea is applied, and the surveyed unit price is shown as in <Table 6.3>. 6-4

Chapter 6. Project execution plan <Table 6.3> Surveyed unit price of valves Surveyed Surveyed unit price 1 unit price 2 Applied unit price Item Diameter (made in (made in Korea) (mm) Korea) KRW KRW KRW IDR USD D2,000 68,090,000 71,550,000 68,090,000 851,125,000 63,046.3 Block D1,800 58,740,000 61,940,000 58,740,000 734,250,000 54,388.9 valve D1,350 35,640,000 38,070,000 35,640,000 445,500,000 33,000.0 (butterfly D600 7,920,000 7,911,000 7,911,000 98,887,500 7,325.0 valve) D350 3,300,000 3,292,000 3,292,000 41,150,000 3,048.1 Air valve D200 1,552,000 1,282,000 1,282,000 16,025,000 1,187.0 (fast D150 705,000 640,000 640,000 8,000,000 592.6 D100 352,000 322,000 322,000 4,025,000 298.1 action) D80 284,000 259,000 259,000 3,237,500 239.8 D500 4,852,000 4,852,000 4,852,000 60,650,000 4,492.6 Drain D450 4,367,000 4,367,000 4,367,000 54,587,500 4,043.5 valve D350 2,152,000 2,152,000 2,152,000 26,900,000 1,992.6 (sluice D150 625,000 625,000 625,000 7,812,500 578.7 valve) D100 325,000 325,000 325,000 4,062,500 300.9 Note) 1. The surveyed unit prices are posted by Korea Price Research Center (May 2018). The unit price 1 is from Korean valve maker S and the unit price 2 is from Korean valve maker D. 2. Applied exchange rate 1 USD = 13,500 IDR, 1 USD = 1,080 KRW, 1 KRW = 12.5 IDR The pump, one of the key materials for the pumping station, is a high-speed rotary machine that requires highly precise technology and experience in production. It needs to be produced in a place where test equipment for performance are fully equipped. Therefore, pumps produced in Korea are applied. We were not able to verify the quality of pumps since there is no local producer. The surveyed unit price is shown as in <Table 6.4>. 6-5

Feasibility Study for Karian – Serpong Raw Water Conveyance System (KSCS), Indonesia <Table 6.4> Surveyed unit price of pumps Item Type and Made in Applied unit price specification Korea KRW Converted into Converted KRW IDR into USD Main pump Double suction 292,000,000 292,000,000 3,650,000,000 270,370 volute pump 1.0CMS (60m3/min) x 50m x 700kW Regulating Double suction 129,170,000 129,170,000 1,614,625,000 119,602 pump volute pump 0.5CMS (30m3/min) x 50m x 350kW Rangkas Double suction type 111,020,000 111,020,000 1,387,750,000 102,796 Bitung system volute pump pump 0.4CMS (24m3/min) x 50m x 320kW Note) 1. Pumps made in Korea is a quoted unit price by Korean pump maker C, and prices for a local control panel and a replaceable flywheel are included. The unit price of locally produced pumps is not surveyed since no local producers were identified. 2. Applied exchange rate 1 USD = 13,500 IDR, 1 USD = 1,080 KRW, 1 KRW = 12.5 IDR As for water level meters and flowmeters for an integrated operation and control system, those made in Korea are applied and surveyed unit price is shown as in <Table 6.5>. <Table 6.5> Surveyed unit price of level meters and flowmeters Type and Surveyed Surveyed Applied unit price specification unit price 1 unit price 2 Item Converted Converted KRW KRW into IDR into USD KRW Intake tower Ultrasonic 4,900,000 5,200,000 4,900,000 61,250,000 4,537 level meter Ultrasonic 21,000,000 23,000,000 21,000,000 262,500,000 19,444 D350 Ultrasonic 24,000,000 26,700,000 24,000,000 300,000,000 22,222 D600 flowmeter Ultrasonic 27,000,000 29,900,000 27,000,000 337,500,000 25,000 D1,350 31,000,000 33,100,000 31,000,000 387,500,000 28,704 33,000,000 35,400,000 33,000,000 412,500,000 30,556 Ultrasonic D1,800 Ultrasonic D2,000 Ultrasonic 36,000,000 38,000,000 36,000,000 450,000,000 33,333 D2,200 Note) 1. The surveyed unit price 1 is a quoted unit price from Korean company G and the surveyed unit price 2 is a quoted unit price from Korean company L. 2. Applied exchange rate 1 USD = 13,500 IDR, 1 USD = 1,080 KRW, 1 KRW = 12.5 IDR 6-6