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0 0 <br /> API publication 2015,January 1991, Section explosion proof light shall be securely fastened <br /> 4.7.2. in close proximity to the entry hole and <br /> protected against damage. Electrical outlets and <br /> connections that are to be utilized for explosion <br /> A7.4 Prior to initiating cleaning procedures, as proof equipment shall be located at a safe <br /> much product and/or water shall be removed as distance from the vapor area and/or tank. No <br /> can be reached from the access opening prior to other electrical equipment shall be allowed <br /> personnel entering the tank (See section within the tank during the initial cleaning <br /> A5.2.2.). procedures of section A7.0 and A8.0. All tools <br /> to be used within the tank during cleaning shall <br /> be composed of a non-spark type material. <br /> A7.5 Initial cleaning shall be performed from <br /> the outside of the tank at the access opening. <br /> An absorbent material capable of absorbing the <br /> liquid residuals shall be spread in the tank from A8.0 TANK CLEANING PROCEDURES <br /> the entry hole over as wide an area as possible <br /> while personnel remain outside the entry hole. <br /> All liquids and sludge on the tank bottom within NOTE: Entry personnel should be familiar with <br /> reach of the access opening shall be absorbed, the potential hazards associated with the stored <br /> and clean dry absorbent shall be placed on top product. Further information on personal <br /> of any depleted absorbent. The dry absorbent exposure limits is available from OSHA <br /> shall be of sufficient quantities to suppress the (Occupational Safety and Health <br /> emission of flammable vapors from the depleted Administration), NIOSH (National Institute for <br /> absorbent. Ventilation shall be maintained Occupational Safety and Health), and ACGIH <br /> throughout the cleaning process to maintain a (American Conference of Government <br /> safe atmosphere. An absorbent material that Industrial Hygenists). <br /> forms a combustible dust such as saw dust, <br /> shall not be used. <br /> A8.1 Upon initial entry, vapor readings shall be <br /> taken. If at any time vapor readings indicate <br /> that the Lower Flammable Limit(LFL) is above <br /> 10 percent (.10), personnel shall immediately <br /> A7.6 Immediately prior to initial entry, vapor leave the tank. Vapor readings shall be <br /> readings shall be performed at the entry hole at performed periodically as determined necessary <br /> the bottom, middle, and top of the tank. The by the qualified person throughout the tank <br /> vapor level shall be at or below 10 percent of cleaning operations to insure that vapor <br /> the lower flammable limit(LFL)prior to entry. readings are at or below 10 percent (.10) of <br /> LFL. Personnel entering the tank shall ensure <br /> that sections A7.1 and A7.3 are complied with. <br /> A7.7 If a light is necessary within the tank <br /> during initial cleaning operations, a Class 1, <br /> Division 1, Group D explosion proof light shall <br /> be used. The electrical outlet to be utilized for A8.2 Personnel shall not walk through liquid <br /> the explosion proof light shall be checked using residuals. Additional absorbent shall be spread <br /> a polarity tester. Electrical outlets with from within the tank to solidify any remaining <br /> incorrect polarity shall not be used. The liquids. Spreading of the absorbent should be <br /> 15 <br />