JOB SAFETY ANALYSIS SHEET, SEQUENCE OF BASIC JOB STEPS: Pre – work, Work, PRECAUTIONS: Plan the work involving personnel responsible for preparation (isolation, depressurization, draining, flushing, purging etc) of the pipeline to be pigged. Review Scope of Work & step by step procedure. Obtain the required work permit Conduct Tool Box Talk. Identify the valve to be closed referring P & ID. Ensure the valves are closed fully. Use Lock & Tag. Depressurize the pig barrel to safe location. Drain the liquid content to trap / sump / safe location. Confirm the absence of pressure by opening a vent to safe location as well as observe pressure gauges reading. Flush the pig barrel with water for possible presence of Phosphoric deposit. Asses the risk & Override gas detectors in case required. Carry out gas test for safe working area. Confirm isolation valve integrity by slight opening the nearest vent / drain point. Confirm the absence of pressure at least from 2 independent sources (e.g. pressure gauges fixed at different location of pig barrel). Use non sparking tools in hazardous location. Keep Fire Extinguishers & fire hose in ready condition. Purge with nitrogen (if required) to remove toxic content. Use air line unit if required. Use safety goggles& Face Shield. Loosen the bolts / studs slowly. Do not stand in front of pig barrel door while opening it. Ensure the closure of pig barrel door after loading the pig. Ensure the closure of all vents & drain valves before start pressurizing the pig barrel. Ensure the normalization of all valves including vent, drain, pressure gauges, gas detectors, liquid trap etc. Ensure proper housekeeping of the area.
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