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|  MIL-P-17869A(SHIPS)
3,4. 1.5.1 All pumps shall have delivery position indicators.
3.4.2 Class III. -
3.4.2.1 Working pressure. - Class III pumps and motors shall be suitable
for continuous working pressures up to and including 2,000 pounds per square
inch. Intermittent operation at 150 percent of working pressure and static
pressure loading at 200 percent of working pressure shall be possible (see 6.3). 3).
3.4.2.2 Efficiency. - Volumetric efficiency shall be in the range of 90 to
95 percent and mechanical efficiency in the range of 85 to 90 percent under full
oil temperature. At 160F. oil temperatures
load conditions and at
(see 3.3. 13), efficiency shall not drop more than 5 percent.
3.4.2.3 Integral auxiliary pumps. - Class III pumps shall be furnished with
integral auxiliary pumps for generation of control and replenishing pressure only
when specified (see 6. 1).
3.4.2.4 Variable delivery control. - Class III pumps shall be constant
delivery type but the contract or order may specify variable delivery control
in accordance with 3.4.1.5, according to the particular application (see 6.1).
3.4.2.5 Instant operation. - Means shall be provided for insuring that vanes
in pumps and motors will be in correct position for instant operation at working
pressure, particularly during cold weather starting. Ambient temperatures
at which pumps will motors will be required to start will range between
and
3.4.3 Class IV. -
3.4.3.1 Working presssure. - Class IV pumps and motors shall be suitable
for continuous working pressures up to and including 1500 p.s.i. Intermittent
operation of 150 percent of working pressure and static pressure loading at .
200 percent of working pressure shall be possible (see 6.3). 3).
3.4.3.2 Efficiency. - Volumetric efficiency shall be in the range of 90 to
95 percent and mechanical efficiency in the range of 80 to 85 percent under full
oil temperatures
load conditions and at 100 "F. oil temperature. At
(see 3.3.13), efficiency shall not drop more than 20 percent.
3.4.3.3 Pump or motor element. - The pumping or torque transmitting
element of class IV pumps and motors shall be spur, helical or herringbone
gears or may be lobes driven by a timing gear arrangement.
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