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TM 9-2350-285-20
1-1. SCOPE (continued).
5.
Under normal circumstances, perform all maintenance on the semitrailer outdoors, away from buildings, and with
tank empty. The semitrailer tank should be checked to make sure it is free of vapors that could ignite during
maintenance activities.
6.
If circumstances require that maintenance be performed inside a building, the semitrailer tank must be thoroughly
drained and purged and the exterior of the semitrailer steam-cleaned. After purging, the combustible gas indicator
must read in the SAFE zone. Even if the semitrailer has tested SAFE with a combustible gas indicator set, the
semitrailer MUST be retested prior to starting work each day and at regular intervals throughout the day. This test
can be accomplished by authorized Unit or Direct Support maintenance personnel with a military occupational
specialty (MOS) of 77F or the equivalent (see FM 10-20).
7.
Hearing protection is required for personnel within 50 feet (15.25 m) of the semitrailer when the pump engine is
running.
8.
To reduce the risk of fire and explosion, DO NOT perform the following operations on the semitrailer unless the
tank has been drained and purged and the exterior has been steam-cleaned:
Replace any component that communicated with the inside of the tank and therefore came in contact with fuel
or vapors; the components include manhole, jet level sensor and tubing, emergency valve, vapor collection
system components, vent caps, sump drain, piping assembly, and rear inlet.
Troubleshoot the electrical system with any test device other than the ohms scale of a multimeter.
Weld or solder.
Cut with acetylene torch or chisel and hammer.
Drill (except aluminum).
9.
Follow these rules if working inside a purged tank:
Always provide adequate forced-air ventilation with air directed inside to the compartment where work is being
performed.
NEVER work alone inside a tank; a second person must be stationed at the manhole opening. The person
inside the tank must have on a safety line and harness for rescue operations in case of emergency.
If the person inside the tank encounters any difficulties, the person stationed at the manhole must summon
assistance IMMEDIATELY. DO NOT attempt a rescue until assistance has arrived.
1-2. MAINTENANCE FORMS, RECORDS, AND REPORTS.
Department of the Army forms and procedures used for equipment maintenance will be those prescribed by (as
applicable) DA Pam 738-750, DA Pam 738-751, or AR 700-138.
1-2
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