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TM 10-3835-231-13
4-20. INITIAL ADJUSTMENTS, CHECKS AND SELF TESTS.
It is recommended that the TPT system, particularly the hose systems, be pressure tested before it is placed in operation.
The purpose of the test is to prove the integrity of the system, by locating leaks, blockages, and installation faults. The
purpose is not to prove the strength of materials; therefore, test pressures are limited to the maximum design operating
pressure. A complete test is recommended; however, it is understood that some deviation may be required due to
specific site conditions and immediate operating needs. The extent of pressure testing and the test media used is up to
the operating authority.
a.
Test Medium.
(1)
Tests can be conducted with one of three different test mediums; air, water, or fuel. The medium used is
dependent on the conditions at the specific site and installation/operations management decision. From a safety
standpoint, a water test is the safest; however it has certain disadvantages, such as removing all water from the system.
Air test should not be conducted at pressure in excess of the 50 psig and, therefore, cannot be used to locate leaks that
occur at higher pressures. A fuel test can be handled safely if care is taken. This method will save time and is considered
adequate.
(2)
After the test medium has been decided and the line to be tested is filled, bring the test pressures up and
hold long enough to thoroughly inspect the system for leaks and faults. The test pressure is then taken off the system and
the leaks and faults corrected. The system must be re-tested after these corrections are made.
b.
Maximum Test Pressures.
(1)
General. Testing is for locating leaks, loose connections, blockage in system and flaws in construction.
Testing will prove the integrity of the facility prior to regular operation. The test pressures listed under (3), (4), and (5), are
below maximum pressures. The operating authority may designate lower pressures at their option.
(2)
Fabric Collapsible Tanks. No pressure is allowed other than static liquid head plus 0.10 psig. Make sure
tank vent is open and clear. The tanks may be filled to approximately 85 percent design capacity, with fuel. All inlet and
outlet valves must be closed. Inspect for leaks. If any leaks develop, the tank must be emptied and repaired, tank refilled
and inspected for leaks.
NOTE
If a section connected to a suction hose is being tested to higher pressure, the
suction hose must be isolated from the tank and tested separately.
(3)
Suction hose maximum test pressures are:
With water
100 psig
With fuel
100 psig
With air
50 psig
(4)
Four-inch and smaller discharge hose, valves and fittings test pressures are:
With water
150 psig
With fuel
150 psig
With air
50 psig
(5)
Six-inch pump discharge and transfer hose, valves and fittings test pressures are:
With water
150 psig
With fuel
150 psig
With air
50 psig
4-45
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