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|  MIL-C-52477D(ME)
4.6.2.4 Hydrostatic pressure.
Subject all pressure vessels, tubing and
fittings (except pressure gages and relief devices) to a hydrostatic pressure of
5,250 psig and hold at this pressure until examined for leaks and distortion.
Any evidence of leakage or permanent distortion shall constitute failure of this
test.
4.6.2.5 Pressure regulator tests.
4.6.2.5.1 Hydrostatic. Subject the high- and low-pressure zones of the
regulator to the test specified in 4.6.2.4. After hydrostatic testing,
disassemble and inspect the regulator for damage. Any evidence of leakage or any
indication of permanent deformation to any internal or external component shall
constitute failure of this test.
4.6.2.5.2 Pressure range. With an inlet pressure of 3,500 psig, set the
regulator for O psig outlet pressure. With the outlet closed and using a device
to measure torque, increase the outlet pressure to 500 psig in steps of 25 psi,
then to 3,500 psig in steps of 250 psi, and then reduce the outlet pressure to O
psig using the same increments of pressure. A torque required to change the
setting in excess of 50 inch-pounds, or failure to regulate the outlet pressure
to any pressure between O psig and 3,500 psig inclusive, shall constitute failure
of this test.
4,6.2.5.3 Outlet pressure variation. With an inlet pressure of 3,500 psig to
the regulator, set the outlet pressure to 500 psig with a flow rate of 4 cfm.
Without further adjustment slowly reduce the inlet pressure to 800 psig. An
outlet pressure variation of more than plus or minus 2 percent shall constitute
failure of this test.
4.6.2.5.4 Overpressure relief device. With a 3,500 psig inlet pressure,
adjust the regulator for a 500 psig outlet pressure. Without further adjustment
of the regulator, connect a variable source of higher pressure gas to the
regulator outlet. Note the pressure at which the pressure relief device starts
to vent and measure the flow rate of the effluent gas as the outlet pressure is
Lower the pressure on the outlet and note the pressure at which the
increased.
pressure relief device reseats. An initial start-to-vent pressure of more than
600 psig, an effluent gas flow rate of less than 10 cfm at 700 psig, or a
reseating pressure of less than 500 psig shall constitute failure of this test.
4.6.2.6 Gage accuracy. Dead weight test the receiver and regulator pressure
gages throughout the pressure range increments no greater than 10 percent of the
full-scale gage reading. Any reading having an error greater than 1 percent of
the full-scale reading of the gage shall constitute failure of this test.
4.6.2.7 Initial performance.
4.6.2.7.1 Test procedure. Operate the compressor with the regulator fully
open, and the back pressure on the outlet maintained at 3,500 psig, until the
specified temperature data have stabilized; then continue operation for a period
of not less than 2 hours, recording data in 10-minute intervals. The data
required are:
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