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2.1.2 Not less than two (2) portable fire extinguishers (A:B:C type),each rated not less than 80B:C shall <br /> be available on the job site at all times. <br /> 2.1.3 All electrical equipment used must be explosion-proof,as specified in NFPA 70(Class 1,Division 1, <br /> Group D). <br /> 2.1.4 Sufficient precautions must be taken to prevent accumulation and discharge of static electricity <br /> (API, RP 2003 or NFPA77). <br /> 2.1.5 A confined space entry training program must be developed by the employer and employees <br /> must be made aware of hazards associated with entering, exiting and working in confined spaces at <br /> normal atmospheric pressure. Training program must include documentation of employee training, <br /> including written records,safety drills,inspections and tests being made available for review by the state <br /> implementing agency. For all tank repairmen, a confined space entry checklist and permit shall be <br /> reviewed and completed prior to entry. <br /> 2.1.6 Tank Isolation and Related Piping <br /> a) Before any work begins, the tank must be completely isolated. Block off any manifolded <br /> lines such as vents, fills or suction from other existing tanks and lines needed to remain in <br /> service throughout the tank lining procedure.Drain product from tanks and vapor recovery <br /> lines, purge or disconnect and "blank off'. <br /> b) "Lock out"all electrical switches supplying current to the submerged pumps and/or other <br /> equipment connected to the tank (see 29 CFR, Part 1910.147). <br /> 2.1.7 Liquid Product Removal <br /> a) Using explosion-proof or air-d(ven transfer pumps, remove as much remaining product, <br /> water and sediment from tank as possible. <br /> b) To float any remaining product from low spots to a level where removal is possible,pump a <br /> small quantity of water into the tank. <br /> 2.1.8 Flammable Vapors Removal(Vapor-Freeing) <br /> a) Purge tank thoroughly with air to remove flammable vapors. The concentration of <br /> flammable vapors may go through the flammable range during this process before a safe <br /> atmosphere is obtained.Take the necessary precautions to prevent the discharge of static <br /> electricity or other sources of ignition during the vapor-freeing process (see API, RP 2003 <br /> and NFPA 77). <br /> b) Purge vapors and ventilate tank using one of the two methods described below (See <br /> Figures 1 and 2). <br /> 1) Use an eductor-type air mover(see Figure 1),typically driven by compressed air,properly <br /> grounded to prevent generation and discharge of static electricity.To ensure ventilation of <br /> the tank bottom, allow the fill (drop) tube to remain in place.Tank air pressure must not <br /> exceed 5 psig. Discharge vapors a minimum of 12 feet above ground, using an air <br /> extension.Some locales may require a scrubber system to reduce the discharge of vapors <br /> into the atmosphere. <br /> 2) Use a diffused air blower to ventilate tank(see Figure 2).The air diffusing pipe must rest on <br /> the bottom of the tank and be properly grounded when using this method to prevent <br /> possible static electricity generation and discharge. Check the air supply from the <br /> compressor to ensure a clean, vapor-free air supply. <br /> 2/99 <br /> Page 4 of 30 <br />