MIL-P-19692E
of rated discharge pressure for systems up to 5000 psi (34,500 kPa) and 120
percent for systems above 5000 psi or as defined in the detail pump
specification.
3.3.13.4 Depressurization. When it is a requirement of the detail
specification that the pump be depressurized, either automatically or
remotely as by an electrical signal, the repressurization control shall not,
when deenergized, interfere with the normal operation of the variable flow
control. The detail pump specification shall specify the requirements of
qualification tests and quality conformance tests of the repressurization
control. When full-flow repressurization is required, the detail pump
specification shall identify the minimum and maximum operating pressure.
3.3.14 Balance. The moving parts of the hydraulic pump shall be balanced
and the pump shall not vibrate in such a manner as to cause failure of any
part in the pump or drive mechanism at speeds up to and required overspeed.
3.3.15 Adjustment. Means shall be provided to adjust the flow control
mechanism to cause zero flow to occur at rated discharge pressure. This
adjustment shall be preferably continuous, or acceptable in steps of less than
one percent of rated discharge pressure over a minimum range of from 95
percent of rated pressure to 105 percent of overpressure. The adjustment
means shall be capable of being positively locked, and it shall be possible to
accomplish adjustment and locking by the application of standard hand tools.
Where practicable, the design shall permit adjustment to be made while
operating under full system pressure with negligible loss of fluid.
3.3.16 Safety wire sealing.
Lead type safety wire sealing shall not be
used.
3.3.17 Directionally critical components. Wherever practical, internal
parts which are subject to malfunction and failure to operate due to reverse
installation or rotated assembly shall have mechanical provisions to prevent
improper installation or assembly.
3.4 Environmental requirements. In general, pumps shall be designed to
operate, without limitations as to time, impairment of function or change in
adjustment, under environmental conditions as specified in 3.4.1 through
3.4.5. Except as specifically directed herein, testing to demonstrate
compliance with these requirements is not mandatory.
3.4.1 Altitude. Provided that inlet pressure is maintained to at least
the rated value as specified in 3.3.4, pump performance shall not be affected
by change of altitude.
3.4.2 Temperature. For purposes of design, it shall be asumed that the
ambient temperature surrounding the pump shall be such that no heat is
transferred to and from the pump except by normal circulation of the working
fluid.
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