Lifeline Vol. 3 2122

L FELiNE Safety Bulletin of Asset Creation Group “Site Safety Observation is the cornerstone of Safety Management System. It is a tool to build trust and raise safety awareness among workmen in a non-threatening way. It also helps a lot to eradicate Unsafe Conditions and Acts from the workplaces. Officers of ACG are regularly conducting Safety Observations at their sites and analyzing the reports for quite a long time. You can find the statistical report of Safety Observations along with all other safety activities of ACG in this bulletin. Wish you a very safe and prosperous new year ahead.” Sujit Kumar Pathak ISSUE EDITORS JANUARY, 2022 DEBAL BANERJEE KISHALAY PATRA

Did you know? - A Safety Harness can withstand a tensile load of 2000 kg In the modern industry and society, there is widespread use of Full Body Double Lanyard Safety Harness with Fall Arrester or “Safety belt”, among the workers of various fields like Construction, Utilities, Mining, Shipping, Aviation, Extreme Sports and many more. While selecting a Safety Harness for a particular duty, care should be taken to ensure that it gives the wearer protection, maximum degree of comfort, freedom of movement and in the event of falling, the greatest possible security against injury either from the impact from ground or from surrounding structures or from the belt itself. Following are the Standards for selection, quality, testing and usage of Safety Harness. IS 3521: 1999, AS 1891: 1976, EN 361, EN 358, ISO/CD 10333-1, 2 & 3. Classification (IS 3521: 1999): Class A - Fall Arresting - Designed to support the body during and after the arrest of a fall. Additionally, depending upon the special purpose of use and features, Full Body Safety harnesses could be classified into following classes. Class D - Designed for controlled descent from a height. Class E - Designed to support the user during entry into and exit from confined spaces. Class L – Designed for use while climbing ladders or towers. Class P - Designed to position the user during a work operation. Class – D, E, L & P must meet the requirements of Class – A. Construction (IS 3521: 1999): The minimum width and thickness of webbing for waist straps, shoulder straps, hoisting straps, sole straps etc. shall be 40 mm and 3 mm respectively. Those shall not break under a minimum tensile load of 19.6 kN (2000 kg). All belts and harnesses shall be made from nylon or other synthetic materials, such as polyester. The material shall have a uniform thickness and uniform width. Threads for sewing the load bearing components shall have similar physical and chemical properties of the materials being sewn. Number of stitches shall not be less than 3 per cm. All rivets and washers if used shall be made of copper. All metal components shall be solid or forged in such a manner that the joint does not impair the strength or quality of the component. The minimum thickness of Chromium Plating shall be 8 microns. Quality Tests (IS 3521: 1999): Flammability Resistance Test, Performance Test, Determination of Static Load and Determination of Dynamic Load. Team Lifeline





Safe Transformer – A Safety Trilogy Chapter 1: Working at Height Standard height of an EHV Transformer, we install in CESC is 8 m, conservator tank being at the topmost point. Roof of the Transformer is about 6 m high on which most of the installation and maintenance jobs like OLTC maintenance, field device maintenance etc. are carried out. Oil filled & Air Insulated Cable Boxes are positioned at about 4 m height, at which access to bushing terminals and CT secondary terminals are provided for testing purpose. The point being, most of the installation & maintenance jobs of an EHV Transformer are basically “Work at Height”. Considering paramount importance of Safety, Engineers of ACG, with Transformer Manufacturers, have introduced design modifications to substantially reduce the risk of working at height. Philosophy of these Engineering Solutions was very simple – either bring down the High Access Points to man-height, or provide safeguard to persons working at those points. Many access points for oil filling, oil sampling or filtration which were supposed to be at the top of the main tank, are brought down to man-height by pipeline modifications. Suitably positioned Ladders, Railings, Platforms of permanent nature are integrated with the Transformer so that a person can comfortably work in those heights of 4 to 8 m. Meticulously designed detachable metal Railing is developed around entire roof of the Main Tank and adjacent Cable Boxes. Due to this fall preventer railing, any person can work safely even at the edge of the rooftop. This sturdy railing can also be used as Lifeline for anchoring safety belts by the workers working on high Main Tank. Cable boxes have separate platforms with access ladders and guard railings to safely work on those. Another similar platform, mounted between Main Tank and Radiator bank is provided for accessing the Conservator Tank and Radiator Bank. Permanent Ladders with Hand Rails are provided to climb the Main Tank, from Main Tank to Conservator Tank and all other platforms at height. With all of these Engineering Solutions envisaged and implemented by practising Engineers of ACG and designed by associated transformer Manufacturers, we are now much safe while working at height of various points of our EHV Transformers. Debal Banerjee





Modern Safety Vigilance Strategy by Using WhatsApp HT Construction Department lays HV power cables at different sites. Workmen of our authorised contractor sets carry out these jobs on regular basis. Hazardous activities like spiking cables, digging, working in excavated area, working on busy thoroughfares, pulling long & heavy cables etc. are involved in this job. Therefore, use of proper safety kits, PPEs, safety gadgets, proper tools and tackles etc. are of paramount importance. Sometimes it is observed that proper safety tools, tackles and PPEs are not available at site or contractor workers are not using them properly. Safety gear audits are regularly carried out but it seems very hard to continuously keep an eye on each and every site. To monitor availability and usage of proper safety gadgets, PPEs and tools at each site, a WhatsApp group called “HT Construction Safety Group” has been formed. Supervisors of authorised vendors, Foremen, Engineers, Managers & General Managers are members of this group. It is now mandatory for contractor supervisors of each site to fill up 39- point safety checklist to ensure availability and usage of safety kits, PPEs, tools etc. and upload the same to this WhatsApp group before commencement of the day’s job. Apart from 39-point checklist, they are also supposed to upload photos of the safety gadgets and PPEs available at site and being used by the workmen. Officers accountable for different sites and superiors can monitor the safety status of each sites and advise or take necessary remedial steps through this WhatsApp group. Now Safety Vigilance of numerous sites is in our fingertips due to this Modern Technology. We created the WhatsApp group on 4th March 2021 and till date we are using it successfully. The benefit of this initiative is reflecting in recent Safety Audit Scores and increasing extent of Incident Free Days. Aritra Saha

Surge Protection Device for Air Conditioners An Initiative towards Fire Safety Air Conditioners are potential source of fire if they experience Voltage Spikes in LT Network. In recent past it was observed that many ACs of different manned & unmanned stations have burnt and some of them dangerously caught fire also. At Akra D/S, Park Circus S/S, East Calcutta S/S etc., this type of incident happened. Being the custodian of these ACs, we were compelled to establish some kind of preventive arrangement against these occurrence. A voltage spike is a transient event, typically lasting 1 to 30 microseconds that may reach over 1,000 volts. Even modest spikes can destroy a wide variety of electronic devices that happen to be plugged in at the time and can burn through wiring insulation and cause fires. To prevent these spikes, we have fixed Surge Protection Devices (SPD) in the circuit of AC loads in parallel connection. The surge device will trigger at a set voltage, around 3 to 4 times the mains voltage, and divert the current to earth. Some devices may absorb the spike and release it as heat. All stations having major AC load are now under protection of SPD which definitely enhancing the overall Fire Safety of our organization. Shirshendu Chatterjee



 ACKNOWLEDGEMENTS Manoranjan Halder Sujit K Pathak Safety Nodal Officer, ACG HOD, Construction Abinash Agarwal Shuvasis S Sarkar Chairman, CSMC Chairman, IIC Debal Banerjee Bratin Banerjee Chairman, R&PC Chairman, SOC Prabir K Haldar Chairman, CBC