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|  MIL-P-18472G(SH)
(a)
Capacity
versus
total head.
(b)
Capacity
versus
pump efficiency.
(c)
Capacity
versus
brake horsepower.
(d)
Capacity
versus
net positive suction head.
Acceptance criteria: The acceptance criteria specified in 4.6.1.3(a) shall be
met. The performance map shall exhibit the specified pump performance charac-
teristics.
Special tests.
4.6.2.2
The following special tests shall be performed:
(a) The pump shall be operated at least 1 hour at recirculation flow
with maximum specified inlet water temperature.
Acceptance criteria: The temperature rise shall not cause the pump to cavitate
or give evidence of incipient seizure. The unit shall operate smoothly without
surging throughout the test. There shall be no unusual noises.
(b) The pump shall be operated at least 1 hour at rated capacity with
maximum specified inlet temperature and the specified net -
positive suction head.
Acceptance criteria:
The pump operation shall not exhibit any indications of a
cavitation condition.
The unit shall operate smoothly throughout the test,
4.6.2. 3 Packing and alignment procedure test (for pumps without mechanical
seals). The pump shall be packed and aligned precisely. The packing shall then
be run in and the pump operated at maximum rated speed with the fluid pumped at
maximum operating temperature. The dynamic balance shall be checked by the use
of a vibration indicator (see 4.6.1.2).
4.6.2.3.1 Acceptance criteria . The packing leakage at the end of the run-
in period shall not exceed the limits recommended by the pump manufacturer. The
vibrations shall not exceed the limits specified in 4.6.1.2.
4.6.3 Design evaluation tests. One pump of each class, design and size
complete with the driver and all appurtenances and controls shall successfully
undergo the design evaluation tests specified herein. Design changes which in
the opinion of the design review agency may detrimentally affect the reliability
of a previously tested and accepted pump design shall be cause to require new
design evaluation tests in part or in full. It shall be at the discretion of the
design review agency to require new design evaluation tests when an accumulation
of several design changes, each of itself apparently not significant to pump
reliability, collectively considered render suspect the validity of any one or
all of the previously performed design evaluation tests. An endurance test need
not be performed provided that the contractor can demonstrate to the satisfaction
of the design review agency that the pump to be offered has been proven in
previous Navy shipboard service under conditions equally as strenuous as those
specified in 4.6.3.1 through 4.6.3.1.6. The proposed design evaluation test
procedures shall be submitted to the contracting agency for approval prior to
performing the tests. The design evaluation tests shall consist of the
following:
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