MIL-P-18140(SHIPS)
(d) Life test (see 4.2.7.1).
(e) Dismantle pump to measure extent of wear and erosion and to note general
condition of pump,
(f) Duplicate runs under (a) and (b) to determine loss of volumetric efficiency,
mechanical efficiency and capacity due to wear (see 4.2.7.2),
(g) Shock test (see 4.3.10.1).
4. 2.7.1 The life test shall consist of a run of 50 hours' continuous duration using 2 mixture of
1 percent fuel oil and 99 percent fresh water, temperature about 100" F., at rated discharge pressure
of the pump and with a suction lift of 5 inches mercury, at the maximum rated speed of pump under test
(see 3.3.8.9.1.1),
4.2.7.2 A comparison of the mechanical and volumetric efficiencies and the capacity of the pump
before and after the life test shall be made to determine loss in efficiencies and capacity due to the life
test. If such comparison shows that the efficiencies or capacity of the pump have not been excessively
reduced in comparison, with other pumps of the type designed for the same service, and if the wear on
any parts indicates that it will not result in complete failure of the pump, the unit will be considered
suitable for use in Government service provided all other requirements of this specification are complied
with. If, however, during the test, complete failure occurs for any reason, the unit will be rejected.
4.3 Performance acceptance tests. -
4.3.1 The driving unit shall be tested as required by the applicable specifications for turbines,
motors, and gasoline or Diesel engines. During these tests the pump shall be operated at sufficient
load to demonstrate conformance to the suction lift and discharge pressure requirements.
4.3.2 AU pumps, except those driven by alternating current motors, shall be tested at 25 percent
over normal speed by a continuous nonstop run of at least 30 minutes; while running at this speed the
pump need not handle load as this is to insure proper alignment and balance. These tests may be con-
ducted without the' driving units, providing the driving units, including reduction gears, if used, have
been independently tested in the same manner.
4.3.3 The rotors, shafts and timing gears, including repair parts of all pumps, shall be tested for
smoothness of running at all speeds, including the 25 percent overspeed test of at least thirty minutes.
4.3.4 One pump of each size and design as selected by the Government inspector, complete,
including the turbine or the motor and controller, and reduction gear, if any, shall be given a test to
determine the overall power or steam consumption of the unit under the conditions of the contract, This
test may be conducted at the shop of the main contractor or subcontractor as arranged with the bureau
or agency concerned, The test ordinarily shall be conducted at the same time as, and shall include,
the inclined operation requirements as specified for the driving units; (see Specifications MIL-T-17523,
MIL-M-17413, MIL-M-17060, MIL-G-17859, MIL-G-18121 and MIL-E-15163). For inclined operation
tests, the unit need not be fully loaded, but shall be run at maximum operating speed and loaded suffi-
ciently to prevent damage to the unit, The functioning of the speed governors of turbine driven pumps
shall be carefully observed during these tests, and all adjustments that may be necessary to insure
operation satisfactory to the bureau or agency concerned at all normal speeds shall be made before the
units are accepted, The turbine governors shall function as specified in Specification MIL- T- 17523.
When pump pressure regulating governors are specified, (see 6. 1) the foregoing test procedure shall
apply also to this equipment. In this test the ability of the pump to handle its rated capacity of specified
liquid at the maximum and minimum viscosities and maximum suction lift specified shall be adequately
demonstrated.
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