VAPOR INTEGRITY TEST
THIS WP COVERS:
Pressure Test Preparation; Pressure Test Procedure; Vacuum Test Preparation; Vacuum Test Procedure
Tools and Special Tools
Direct and General Support
Tool kit, general mechanic's (item 4, WP 0156 00 )
Semitrailer disconnected from prime mover (refer
to WP 0007 00)
Semitrailer grounded (refer to WP 0007 00)
WP 0149 00
Testing personnel must be registered with DOT in
accordance with DOT regulation 49CFR180.409.
PRESSURE TEST PREPARATION
Use extreme caution when walking or working on
the top of semitrailer. Walkway can become slippery
due to moisture or fuel spillage. Failure to follow this
warning may result in serious injury.
Before performing the pressure or vacuum test, the
semitrailer must be grounded to an approved (earth)
ground and must be safe to proceed. Failure to follow
this warning may cause a spark to ignite, resulting in
serious injury or death to personnel.
Make sure tank and piping system are free of all liquid
and that tank is purged of all fuel vapor (implement the
cleaning procedures, as applicable, refer to TB 43-0212).
Failure to follow this warning may cause a spark to ignite,
resulting in serious injury or death to personnel.
Select an area with minimum temperature changes, which
directly affect pressure readings. Do not perform the
pressure test in direct sunlight.
Visually inspect outside of tank and all associated piping.
Look for stained areas that indicate obvious leakage. Repair
obvious leaks prior to performing pressure test. Inspect
discharge valve to ensure leak-free operation.
Make sure test equipment gages are set to zero by turning
adjusting screw on each gage.