MIL-P-19692E
c. 4000 psi (28000 kPa) system =
4850 psi (34000 kPa) overpressure
d. 5000 psi (35000 kPa) system =
5850 psi (41000 kPa) overpressure
e. 8000 psi (56000 kPa) system =
8850 psi (62000 kPa) overpressure
3.3.3 Maximum full-flow pressure. This is the maximum discharge pressure
at which rated flow can be developed at rated temperature, rated speed, and
rated inlet pressure. Its value shall be no less than 95 percent of rated
discharged pressure, unless indicated differently in the detail specification.
3.3.4 Rated inlet pressure. This is the indicated pressure at the inlet
port of the pump when the pump is operating at rated speed, maximum full-flow
pressure, and rated temperature. The rated inlet pressure shall be measured
at the inlet port of the pump. Rated inlet pressure shall be measured at the
inlet port of the pump in a manner which indicates the static head, and shall
be expressed in psia or kPa absolute. The value shall be established in the
detail pump specification.
3.3.4.1 Minimum inlet pressure. This is the lowest inlet pressure at
which the pump shall be required to operate during a system failure or during
system flow transients. The detail specification shall state a value and
whether it applies during transients or during a steady state failure case.
Note that since the aircraft system impedance may not be specified in
4.3.2.1.6.1.1 (impedance of pump test circuit), it is important to determine
the pump response in the aircraft circuit and that the inlet portion of the
system shall be designed to respond as rapidly as the pump. Dynamic
cavitation in the inlet sections of the pump will otherwise occur.
3.3.4.2 Maximum inlet pressure. This is the maximum steady state inlet
pressure at which the pump shall be required to operate in the hydraulic
systems. The value of the maximum inlet pressure shall be established in the
detail pump specification.
3.3.5 Case drain port pressure and flow. Unless otherwise specified in
the detail specification, all pumps shall be designed to withstand a proof
pressure of at least 500 psi (3450 kPa) at the case drain port or 150 percent
of rated case drain pressure, whichever is greater, without permanent damage
or impairment of pump function.
3.3.5.1 Rated case drain pressure. Rated case drain pressure is the
nominal case drain port pressure at which the pump is required to operate
continuously in the system. The value shall be stated in the detail pump
specification.
3.3.5.2 Maximum transient case drain pressure. This is the maximum
pressure spike that may be imposed on the pump case drain port. A value and a
frequency of occurrence shall be specified in the detail pump specification.
3.3.5.3 Case drain flow. At rated discharge pressure, rated inlet
temperature and at any speed from 50 to 100 percent of rated speed, the pump
shall be capable of producing a minimum case drain flow at a given maximum
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