Operating temperature range

Page Title: Operating temperature range
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MIL-P-17869A(SHIPS)

3.3.12.1 Pipe connection sizes.-

Size of pressure ports and pipe flanges at normally

3.3.12.1.1 Pumps.-

rated output shall be such that velocity of the hydraulic fluid through the con-

nected pipe will not exceed 20 feet per second. Suction ports shall be of a size

to permit entry of fluid at a velocity of not more than 5 feet per second at

normally rated output. Where a pump is used in a closed hydraulic power trans-

mission circuit and the pump intake is supercharged or replenished, suction

and pressure ports may be of the same size, that is, that which will limit fluid

velocity to 20 feet per second.

Pressures and discharge ports shall be of a size

3.3.12.1.2 Motors.-

that will limit fluid velocity in and out of the motor to 20 feet per second at

normal rated speed.

3.3.13 Operating temperature range.- Pumps and motors shall operate

satisfactorily at fluid discharge temperatures between

and

Pumps

and

and motors shall operate at fluid suction temperatures between

3.3.14 Hydraulic fluid.- Pumps and motors shall be designed to operate

efficiently using any of the hydraulic fluids specified in Specification MIL-L-15017

or MIL-L-17331, as applicable.

3.3.15 Lubrication.- Pumps and motors shall be self-lubricating by means

of the fluid circulating within the case.

3.3.16 Pressure pulsation.- Pumps shall be designed to deliver a steady

flow of fluid without pressure pulsation of more than 5 percent above or below

continuous rated working pressure. This allowance shall become uniformly less

at operating pressures less than rated working pressure.

3.3.17 Vibration and noise.-

3.3.17.1 Class I, II, and III pumps and motors shall be designed and

built so as to m inimize vibratory forces which may cause undue vibration, noise

and wear.

3.3.17.2 Class IV and V pumps and motors shall be balanced in accordance-

with type II (internally excited vibration of Standard MIL-STD-167). The method

of applying balance correction shall be left to the discretion of the manufacturer.

Vibration measurements shall be extended to cover higher orders of vibration

as specified in Standard MIL-STD-167.

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