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TM 9-2330-272-14
4-64. PURGING TANK (Con’t) .
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CAUTION
Ensure that steam does not come In contact with electrical wiring and other
components. The heat of steam can damage painted surface of tank, valve seats,
gaskets, and diaphragms.
Steam tank for a minimum of three hours. Turn steam source off.
CAUTION
After purging by steam method, leave tank valves and drain points open during
cool-down to prevent vacuum collapse of tank.
Leave all valves and drain points open until tank is fully cooled, at least one hour.
Measure explosive vapor level, Take readings in several areas of tank. Readings should be 20% lower
explosive level (LEL) or less. If LEL is greater than 20%, repeat steam cleaning for one hour. Continue steaming
until 20%. LEL or less is obtained.
After tank has been freed of combustible vapors, it is ready to clean, repair, paint, store, change material, or
ship.
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