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0 0 <br /> A6.2 After the manway cover is removed or a flammable vapors. <br /> hole is cold-drilled in the tank, lubricating oil or <br /> other appropriate measure shall be used during A7.2 The following equipment shall be <br /> the drilling process to reduce friction, heat, and available to the standby person for rescue <br /> possible sparks. Vapors must again be tested by operations or other emergencies: a positive <br /> inserting the probe into the manway or drilled pressure, air supplied respirator with full face <br /> hole to insure that the vapor concentration does enclosure; a safety harness which is connected <br /> not exceed 10 percent (10) of the lower <br /> flammable limit(LFL). to a safety line; aself-contained breathing <br /> apparatus;and fire extinguishers. <br /> A6.3 Ventilation that will maintain a safe A7.3 During the cleaning process, personnel <br /> atmosphere at or below 10% LFL shall be entering the tank shall wear a positive pressure, <br /> continuous throughout the access opening air-supplied respirator with full face enclosure at <br /> process. When an air blower system is used, all times. Personnel entering the tank during the <br /> minimal air pressure shall be maintained during cleaning process shall wear a safety harness <br /> tank opening to prevent the sudden release of connected to a safety line which must be <br /> air pressure from the tank or blowout of the securely attached outside the tank's entry <br /> tank plate or manway lid during opening. opening. Oil and water-resistant boots, gloves, <br /> and protective clothing which are static <br /> dissipating must be worn by tank cleaning <br /> personnel. Clothing shall cover the arms, legs, <br /> A6.4 The access opening shall be cold-cut torso and head. Disposable clothing, <br /> using an air-driven saber saw or snipper. impervious to product, is preferred. Clothing <br /> Lubricating oil or other appropriate measure saturated with product shall be removed <br /> shall be used during the opening process to <br /> reduce friction, heat, and possible sparks. Prior <br /> to the final cut, the tank's entry section being <br /> removed shall be supported to prevent it from immediately. For information on static <br /> falling into the tank. electricity see NFPA 77. <br /> A7.0 PRE-ENTRY PROCEDURES <br /> WARNING: Tank cleaning which requires the <br /> spraying of water or steam into tanks should not <br /> be used as part of this standard. Water spray <br /> A7.1 Ventilation that will maintain a safe jets, water-hose streams, or steam can generate <br /> atmosphere at or below 10% LFL shall be static charges at the nozzle and upon those <br /> continuously maintained prior to tank entry and objects which the water impinges. Grounding <br /> while personnel are working within the tank. the jet nozzle will not prevent a static charge <br /> Tanks shall not be considered clean until from being generated. For more information <br /> abrasive blasted to white metal, all blasting see API publication 2003, March 1982, <br /> media removed, and the tank tested for Section2.17,Protection Against Ignitions Arising <br /> flammable vapor. Tanks must be abrasive Out of Static,Lightning,and Stray Currents& <br /> blasted in accordance with section A9.0 to be <br /> clean and free of residuals capable of producing <br /> 14 <br />