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|  MIL-P-18472G(SH)
couplings and geared units may be tested by separate pump, gear unit and driver
overspeed tests. The dynamic balance shall be checked by the use of a vibration
indicator of a type whereby vibrations of an amplitude of 0.001 inch may be
readily observed on a scale.
4.6.1.2.1 Acceptance criteria . Neither the pump nor the driver shall
exhibit abnormal noises or roughness of operation. Vibration shall not exceed
the MIL-STD-167-1, type II vibration limits for this equipment.
4.6.1.3 Mechanical soundness and capacity tests. This shop test shall be
conducted and recorded in accordance with the centrifugal pump Rating Standard
and Test Code of the Hydraulic Institute, to the extent that these standards are
applicable and are not in conflict with the requirements specified herein. The
test record for each pump shall identify the pump and driver by manufacturer's
serial number; it shall indicate the diameter of the pump impellers being tested
in the pump; it shall include a description (by legend and sketch) of the test
stand arrangement including an identifying list of test instruments used and the
date when last calibrated; and it shall include the data sheets of all recorded
data and sample calculations of data conversion to specified conditions. Test
data used for plotting the head-capacity curve shall be corrected to the
specified operating conditions. The test shall be performed in three phases, as
follows:
(a) Operate the pump and its driver, if motor driven, continuously at
maximum rated speed and capacity, with the pumped fluid at the
specified operating temperature (see 6.2) until bearing tempera-
tures (not including water-lubricated bearings) stabilize as
manifested by at least three consecutive equal bearing tempera-
ture indications taken at intervals of not less than 15 minutes.
Variations in temperature of the liquid pumped will be permitted
provided the liquid is at saturated conditions for class D-1 and
D-2 pumps and within plus or minus 20F for class E pumps. The
pump operation shall be fully monitored throughout this test for
proper functioning of packings and seals and bearing lubrication,
and for smooth running, The amount of packing leakage shall be
measured at regular internals and recorded.
Acceptance criteria: 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 50F in any bearing and shall not exceed 180F with
inlet cooling water to the oil cooler at 85F. There shall be no abnormal
leakage of water or oil. For grease lubricated bearings the maximum outer race
bearing temperature shall not exceed 194F.
(b) Operate the pump at the maximum rated speed with the pumped fluid
at the specified maximum normal temperature from recirculation
flow to as close to free delivery as practicable. The unit shall
be operated at seven or more test points, throughout the full
operating range, to establish 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. Test shall
include data for an NPSH curve.
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