TM 10-4930-204-13(b) If electrical welding is to be performed, be sureyou have adequate shielding to protect other workers from injury.(c) This process is to be undertaken by direct supportmaintenance units.Supporting agencies will furnish additional skillsand equipment when required.(2) Essentials.(a) Purge tank in accordance with TB 1047.(b) Materials required.1.Adequate source of water with a large diameterhose long enough to reach the vehicle or fuel tank. ,2.Compressed air source and air hose ofsufficient length to reach depth of fuel tank.3.Sufficient quantity of gas tank purger (item8, App. F).(3) Safety precaution.Prior to and during all operations outlined inthis bulletin, coordinate with safety, medical,and fire departments to comply with safeguardscontained herein and other applicable directives.(a) The tank being purged must have a static groundduring all operations; cautions should be taken with all tools andmetal objects around tank to ensure no contact of sufficient force ismade to create a spark.(b) Conduct a combustible vapor test reading prior topurging the tank, using an acceptable explosive meter, such as MSAExplosive Meter 6665-00-664-4650 or Davis Vapotester 6665-00-562-8103.(c) Only competent personnel, thoroughly instructed inthe proper handling and reading of the vapor indicating instruments(explosion meter), will perform vapor tests.(d) Conduct a combustible vapor test reading immedi-ately after purging.Under no circumstances will repair of fuel tankbegin until declared safe by safety personnel.(e) Discontinue all operations if an electrical stormis threatening or in progress.(f) Eliminate all possible causes of explosion.5-48
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