Fuel
Systems
Tests
FEDERAL LAW
183.586 - Pressure impulse test
(f) Apply 25,000 cycles of pressure impulse
at the rate of no more than 15 impulses per minute varying
from zero to three PSIG to zero inside the tank top
from a regulated source of air, inert gas or water.
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A regulated source of pressurized air or compressed
inert gas should be connected to the tank fill pipe. A calibrated
pressure gauge should be connected to the vent or fill pipe
to monitor the tank pressure.
A pressure relief valve should be installed
in the pressure gauge line. Adjust the pressure relief valve
to 3.5+/-0.5 psig.
A pressure switch with a maximum range of 0
- 20 psig should be installed into the pressure gauge line.
The pressure in the tank should be controlled
by a solenoid valve. A counter capable of recording 25,000
cycles should be tied to the solenoid valve.
In this test, the pressure in the fuel tank
should vary from zero psig to 3+/-0.4 psig at a rate not to
exceed 15 cycles per minute. The cycle rate will vary depending
on the following conditions:
(a) supply pressure
(b) air volume in the tank after water is added
(c) line sizes
(d) valve sizes, particularly in the vent port
(e) actual pressure settings
NOTE:
Any of the above may be varied within reasonable limits to
give the desired cycle rate up to the maximum of 15 cycles
per minute.
Apply 25,000 cycles of pressure to the fuel
tank. It should not leak during or after this test.
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