MIL-P-18140(SHIPS)
4.2.2 Qualification tests shall be conducted to determine that performance and design of the pumps
are in compliance with this specification. The pressure, capacity, and other characteristics of the unit
for the qualification test shall be as arranged between the Bureau of Ships and the exhibitor.
4.2.3 To be granted qualification approval as the result of service tests the following requirements
shall be met:
(a) Two or more pumps of the same general design and general operating
characteristics must have given satisfactory service onboard Naval
vessels for a period of at least two years and must still be in service
on such vessels at the time qualification approval is requested,
(b) When the design of pump in service, for which the manufacturer request
qualification approval, does not meet current Naval requirements as
regards suction lift, discharge pressure and capacity characteristics,
the manufacturer will be required to furnish satisfactory evidence that
he has produced pumps of a design, suction lift, discharge pressure
and capacity characteristics equal to those currently required for
Naval service. The Bureau of Ships may require additional qualification
approval tests of any design of pump which in its opinion has been changed
sufficiently to require further demonstration of its suitability.
(c) Any manufacturer whose product has been placed on the qualified products
list as a result of service test will be required, on his first contract or
order, after being granted qualification approval to submit a complete
unit to a Government laboratory designated by the Bureau of Ships for
a check test which will consist of the tests conducted for qualification,
4.2.4 Separate qualification tests will be required on vertical and on horizontal units of each type,
except that qualification granted on vertical design may be extended also to cover horizontal design at
the discretion of the Bureau of Ships.
4.2.5 Units submitted for qualification test shall be operated at the maximum rubbing speed for
which the unit is designed. Approval of a design of pump operating at a rubbing speed greater than that
at which the tested unit operated on qualification approval test will not be given without an additional life
test (see 3.3.16 and 4.2.7. 1), The life test specified in 4.2, 7, 1 is intended to demonstrate the reliability
of the type.
4.2.6 Unless otherwise arranged between the Government and the exhibitor, the pump for the
qualification test shall be furnished complete with a prime mover and necessary accessories. The
prime mover need not be made to Government specifications; however, see 4, 3, 10.3, Qualification of
a pump does not include qualification of the driver,
4.2.7 The following tests, in the order listed shall be made to determine qualification:
(a) Performance tests to demonstrate the ability of the pump to operate at the design
characteristics (see 4.2. 2), Sufficient data shall be taken during these tests to
prepare pump characteristic curves as specified in 4.3.5, except that curves
of capacity versus power input to the driving unit, as specified in 435 (e),
will not be required,
(b) Additional operating runs under c conditions to be selected by the Bureau of Ships
to determine:
(1) Volumetric efficiency, (2) mechanical efficiency and (3) capacity, at
varying speed,
(c) Dismantle pump and measure all parts subject to wear and erosion.
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