TM 10-4930-204-13
(b) If electrical welding is to be performed, be sure
you have adequate shielding to protect other workers from injury.
(c) This process is to be undertaken by direct support
maintenance units.
Supporting agencies will furnish additional skills
and equipment when required.
(2) Essentials.
(a) Purge tank in accordance with TB 1047.
(b) Materials required.
1.
Adequate source of water with a large diameter
hose long enough to reach the vehicle or fuel tank. ,
2.
Compressed air source and air hose of
sufficient length to reach depth of fuel tank.
3.
Sufficient quantity of gas tank purger (item
8, App. F).
(3) Safety precaution.
Prior to and during all operations outlined in
this bulletin, coordinate with safety, medical,
and fire departments to comply with safeguards
contained herein and other applicable directives.
(a) The tank being purged must have a static ground
during all operations; cautions should be taken with all tools and
metal objects around tank to ensure no contact of sufficient force is
made to create a spark.
(b) Conduct a combustible vapor test reading prior to
purging the tank, using an acceptable explosive meter, such as MSA
Explosive Meter 6665-00-664-4650 or Davis Vapotester 6665-00-562-8103.
(c) Only competent personnel, thoroughly instructed in
the 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 tank
begin until declared safe by safety personnel.
(e) Discontinue all operations if an electrical storm
is threatening or in progress.
(f) Eliminate all possible causes of explosion.
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