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Non-destructive inspection and ultrasonic inspection |
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|  MIL-P-18682D(SH)
4.6.5 Non-destructive inspection and ultrasonic inspection. All non-
destructive inspection, all welding, and all inspection of welds shall comply
with MIL-STD-278 and MIL-STD-271.
4.6.6 Performance evaluation tests. One pump of each type, design, and
size on each contract or order shall successfully undergo the performance
evaluation tests to establish the complete pump performance map and to ascertain
compliance with the specified performance requirements. Motor driven units shall
be tested with the motor to be furnished with the pump. A substitute driver may
be used for turbine driven pumps. When pumps of identical type, design, and size
are being produced under two or more contracts within a 2-year period, only one
series of performance evaluation tests shall be required for that production `run.
The following tests shall comprise the performance evaluation tests:
(a) Performance test (see 4.6.6.1).
(b) Mechanical shaft seal and pump alinement
procedure test (see 4.6.6.2).
4.6.6.1 Performance test. The performance tests shall be conducted,
recorded, and reported in accordance with the requirements of the test specified
in 4.6.3, except that, in addition, a full performance map shall be established.
The proposed test procedure for this test shall be submitted to the contracting
activity for approval approximately at the time of drawing submittal. Test data
shall be converted to specified operating conditions for plotting of all perfor-
mance curves. The performance curves shall be determined at maximum and minimum
operating speed for variable speed pumps and at each operating speed for multi-
speed pumps. A full net positive suction head (NPSH) curve is required on lead
production unit and on subsequent units the NPSH shall be determined at design
rated capacity only. The following curves shall be established:
(a)
Capacity
versus
total head.
(b)
Capacity
versus
pump efficiency.
brake horsepower.
(c)
Capacity
versus
(d)
Capacity
versus
net positive suction head required.
Acceptance criteria: The acceptance criteria specified in 4.6.3(a)
shall be met. The performance map shall exhibit the specified pump performance
The net positive suction head required shall not exceed the
characteristics.
minimum suction head available specified in 6.2.1. Controls and safety devices
shall function reliably as intended throughout the full operating ranges of
capacity and speed.
4.6.6.2 Mechanical seal and alinement test.
Mechanical seal and alinement
test shall be as follows:
(a) The mechanical seal shall be installed and alined precisely in
accordance with the procedures stated in the proposed pump
technical manual. Packing shall not be installed during this
test. The amount of force required to axially position the
mechanical seal onto the impeller hub, the shaft sleeve or
whatever it rests on in the assembled condition shall be
measured and recorded. If the mechanical seal includes an
adhesive or setting compound on the elastomer that seals
between the mechanical seal and the impeller hub or shaft
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