MIL-DTL-62011E
4.6.15 Low and high temperature operation.
4.6.15.1 Low temperature operation (see 3.6.1).
a.
The test apparatus tank shall be filled to a level at least 2 inches above the pump.
b.
The test fuel shall conform to grade 2-D of A-A-52557, except that the cloud point shall be
-65 °F (-54°C) or lower.
The temperature of the tank and its contents shall be lowered to -65±5 °F (-54°C) and
c.
maintained at that temperature for at least 16 hours.
The pump shall then be operated at 18±0.1 and 27.5±0.1 V dc and the pressure and flow
d.
rate measured.
4.6.15.2 High temperature operation (see 3.6.1). A test tank shall be filled to a level at least 2 inches
(51mm) above the pump. The tank and its contents shall be heated to a temperature of 125±5 °F (52°C)
and maintained at that temperature for at least 4 hours. The pump shall then be operated at 18±0.1 and
27.5±0.1 V dc and the pressure and flow rate measured.
4.6.16 Explosion-proofness (see 3.6.2).
a.
An unused dry pump shall be installed in the test chamber of 4.6.16.1 and an all purpose
gasoline shall be vaporized and drawn into the chamber.
b.
The quantity of gasoline used shall be calculated to result in an air fuel ratio within limits
of 13:1 to 15:1 (by weight).
c.
The pump shall then be operated for a period of 15 minutes.
d.
Immediately after the 15 minute pump operation, the mixture in the chamber shall be
ignited to verify that an explosive mixture existed during the test period.
e.
Withdrawal of the mixture sample for explosive mixture testing in a separate vessel is an
allowable alternate procedure.
4.6.16.1 Explosion test chamber. The test shall be conducted in a test chamber having the following
features:
a.
A pressure release system that operates when an explosion occurs within the chamber.
b.
A hinged or removable pressure-sealed door large enough to permit installation of the
pump.
c.
A means of circulating vapors within the chamber.
d.
An observation window.
e.
Cable ports with pressure-tight seals.
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