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|  MIL-P-27431B(USAF)
4.5.1 Individual test.
Each purging unit shall be subjected to the following
tests:
a. Examination of product . . . . . . . . . . See 4.6.1
b. Proof pressure test . . . . . . . . . . . See 4.6.2
c. Performance test (short method).See 4.6.4
4.6 Test methods.
4.6.1 Examination of product. The purging unit shall be inspected to determine
compliance with the requirements specified herein with respect to the following.
Evidence of noncompliance shall be cause for rejection.
a. Configuration compliance to design (See 3.5.5)
b. Proper use of polytetrafluoroethylene tape on pipe threaded
joints.
c. Weight of heat exchanger assembly.
d. Weight of complete purging unit.
e. Length, wire size, and plug connector for power cable.
f. Operating instruction and identification marking plates.
g. Materials.
h. Workmanship.
i. Identification.
4.6.2 Proof pressure test. The heat exchanger assembly and a pressure sensing
device shall be assembled as shown on Figure 4 and clean, dry, oil free air,
nitrogen, or oxygen at 1,000 psig pressure shall be applied to the system. The
pressure source shall then be removed leaving the system at 1,000 psig as indicated
by the pressure sensing device. The system shall be allowed to stand in this
condition. Leakage shall not exceed 1 cubic centimeter per minute pressure loss to
be computed from system volume.
4.6.3 Burst pressure test. The heat exchanger assembly, and a pressure sensing
device shall be assembled as shown on Figure 5. Hydrostatic pressurize until rupture
occurs. A rupture at less than 2,000 psi shall be cause for rejection.
4.6.4 Performance test (short method). The purging unit and other components as
shown on Figure 3 shall be assembled and instrumented. Clean, dry, oil free air,
nitrogen, or oxygen at 100 5 psig shall be applied to the heat exchanger inlet, 115
5V, 60 or 400 cycle, single phase power shall be applied to the power cable and the
toggle switch turned on. Flow rate, outlet temperature, inlet pressure, clasped
time, and applied wattage shall be measured for at least 20 minutes starting with the
first application of power to the heating element. The time required for the heating
element to reach thermostatic cutoff temperature shall also be recorded. This
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