4-8TM 10-4930-220-13&P(2)(3)(4)(5)(6)(7)(8)(9)Completely drain all liquid fuel from tank in accordance with TB 1047.Remove waste liquid fuel and Iiquid soaked waste material from work area.Thoroughly clean all flammable Iiquid from work area floor.Remove all accessories which might entrap liquid.Close or seal all drains.Fill tank with cold water and overflow for five minutes.Drain tank completely.Close or seal all drains.NOTEInsufficient amount of chemical will result in an Incomplete purging. Accuratecomputations of the amount of chemical to be used must be made prior to thepurging. Once the purging has begun, do not stop until the process is com-plete.(10)(11)(12)(13)For each 100 gallon capacity, add 40-fluid ounces of purging chemical or 240-fluid ounces fora 600 gallon tank and fill the tank with water. Do not overflow.Insert an airline into the tank opening and agitate the solution with 3 to 5 psi of air for five minutes.Frequently move the air hose around in the tank covering as much area as possible espcially nearthe bottom. Remove air hose and drain the tank.Fill the tank and overflow for five minutes with cold water or until the water is dear. Drain the tankcompletely.Conduct a combustible vapor test reading to determine if the tank is safe to repair, dean, paint,store, or change materials. If combustible vapor test reading indicates tank is not safe, repeatprocedure as cited in subparagraphs (1) through (12) above.NOTETesting to determine if tanks are safe for entry will be performed only by tech-nically qualified safety or health personnel.(14) If repair procedures must be performed inside the tank, perform pre-entry testing for air contami-nants and oxygen deficiency to determine if the tank is safe for entry.c.Inspection.(1) Condition of paint. Check the tank for condition of paint and indicate whether repainting is re-quired.(2) Dents, break, holes, or cracks. Check tank for dents that require repairs. Check dents on weldsfor break in weld seam. Check for any damage or wear that has caused a rupture or leak.Change 1
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