TB 43-0151
(3) Operate the compressor and check for proper operation of all gages and valves and ensure that the
unloader operates properly. Observe and record the time, temperature, and gage readings through the normal operating
pressure range.
(4) Relieve the pressure; plug, block off, or disconnect the supply line to the unloader.
(5) Extend the service hose; attach and extend an extra strength hose, gage, and valve to a protected position.
Securely anchor the hose, valve and gage.
(6) Clear the area of personnel.
(7) Open all line valves to and on the extended hose and operate the compressor.
(8) Take a protected position (c(2) above) and close the valve on the extended line. Observe and record the
gage reading at which the final stage safety valve operates.
(a) If an intermediate stage safety valve operates before the final stage safety valve, open the hose valve,
relieve the pressure, stop the compressor, replace the intermediate safety valve, and repeat the test.
(b) If a final stage valve fails to operate at 110 percent of the normal operating pressure, open the hose valve,
relieve the pressure, stop the compressor, replace the final stage safety valve, and repeat the test.
(9) Open the hose valve to relieve the pressure on the unit.
(10) Stop the compressor.
(11) Remove the extra strength hose, gage, and valve.
(12) Remove the plug; replace, unblock, or reconnect the unloader.
(13) Visually inspect and operate the compressor, check for proper operation of all gages, and ensure that the
unloader operates properly. Observe and record the time, temperature, and gage readings through the normal operating
range.
5. Hydrostatic Test.
a. All air and gas receivers (excluding compressed gas cylinders) subject to a working pressure in excess of 501 psi
(35.2 kg./sq cm) shall be subjected to a hydrostatic pressure test, which at every point in the receiver is at least equal to
150 percent the maximum working pressure. Receivers in use shall be given a hydrostatic test every 24 months or at any
time a receiver shows evidence of bad dents, corroded areas, leakage, or other conditions that indicate weakness which
might render the receiver unsafe. To perform the test, disconnect the receiver from the inlet and outlet connections and
install a pressure gage between the receiver and the liquid pump. All safety devices shall be removed
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