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TM 9-2330-272-14
4-64. PURGING TANK (Con’t).
4.
5.
6.
7.
8.
9
CAUTION
Insufficient amount of chemical will result in an incomplete purging. Once purging has
begun, do not stop until process is complete.
NOTE
For detailed information concerning purging chemical, refer to TB 43-0212.
Add 40 fl oz (1183 ml) of chloro-carbon base purging chemical to tank for each 100 gl (379 I) capacity. A
5000 gl (18,925 I) tank will take approximately 17 gl (64 I) of purging chemical.
Fill tank to top with water. Do not overflow.
Insert air hoses through manhole openings and agitate solution with 3-5 psi (21-34 kPa) of air for 40 minutes.
Frequently move air hoses around in tank, covering as much area as possible, especially near the bottom and
around baffles. Remove air hoses and drain solution from tank at all valves and drain points.
FiII tank with cold water and allow to overflow for five minutes or until water is clear. Drain tank completely at all
valves and drain points.
Measure explosive vapor level to determine if tank is safe to repair, clean, paint, store, change material, or ship.
Take readings in several areas of tank. Readings should be 20% lower explosive level (LEL) or less. If any
reading indicates tank is not safe, repeat step 7 until a safe reading is obtained.
After tank has been freed of combustible vapors, it is ready to clean, repair, paint, store, change materiel, or
ship.
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