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|  MIL-P-18682D(SH)
Acceptance criteria: Unit operation shall be without heating and shall
be free of abnormal vibrations and noises. Oil temperature rise in force-feed
lubricated bearings shall not exceed
with inlet cooling water to the oil
cooler at
Controls and attached instruments shall function as specified
and are in calibration. There shall be no abnormal leakage of water or oil.
Operate the pump at the maximum rated speed with the pumped fluid
(b)
at maximum normal temperature from recirculation flow as close
to free delivery as practicable and with the minimum specified
suction pressure prevailing. The unit shall be operated at seven
or more test points throughout the full operating range to estab-
lish accurately the head-capacity curve at maximum rated speed.
The unit shall be operated at each test point until the test
values being measured stabilize. In addition to the above test-
ing, determine the required net positive suction head at the
maximum rated speed at maximum rated flow rate.
Acceptance criteria: The pump shall deliver the rated capacity and head
from the head at the corresponding capacity on the head-capacity curve at maximum
rated speed established in the performance test of 4.6.6.1. If more than one
performance test has been performed for a given pump design for use in a given
ship class, then the head capacity curve established in the first performance
test is the one to which the preceding sentence refers. The head-capacity curve
at maximum rated speed shall satisfy the specified requirements. The total head
at all capacities from O to 120 percent of rated capacity on the curve shall not
deviate by more than plus or minus 2.5 percent of rated head under 500 feet. In
no case shall the pump deliver less than the rated head. The required net
positive suction head shall not exceed the minimum net positive suction head
available as specified in 6.2.1. Pumps originally qualified in accordance with
earlier revisions of this specification shall continue to meet the head repeat-
ability percentage requirements of the applicable earlier revision, not the above
plus or minus 2.5 percent requirement in order to maintain consistency with the
original design of the shipboard piping system.
(c) Operate the electric motor-driven unit for a minimum of 1 minute in
reverse rotation at maximum rated speed.
Acceptance criteria: The unit shall not be damaged by the reverse rotation
test. Conformance to hydraulic and noise requirements shall be demonstrated
subsequent to the reverse rotation test.
4.6.4 Noise tests. Airborne and structureborne noise tests when speci-
fied (see 6.2.1) shall be conducted and reported in accordance with MIL-STD-740.
Noise test details, instrumentation, and testing techniques identified in
MIL-STD-740 shall be submitted to the contracting activity prior to testing for
approval. Noise tests shall be performed with the driver furnished with pump,
and tests shall be conducted on all units. Airborne noise tests shall be
conducted on the lead unit only on each contract or order.
Acceptance criteria:
The unit shall meet the noise level limits specified
in 6.2.1.
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