Click here to make tpub.com your Home Page

Page Title: Endurance test
Back | Up | Next

Click here for thousands of PDF manuals

Google


Web
www.tpub.com

Home

   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Logistics
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
   
   

 




img
MIL-P-17639F(SH)
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 vendor can demonstrate to the satisfac-
tion of the design review agency concerned that the pump to be offered has
been proven in previous Navy shipboard service under conditions equally as
strenuous as those specified in the ordering data.  The proposed design evalua-
tion test procedures shall be submitted for approval to the contracting activity
prior to performing the tests.  The design evaluation tests shall consist of
the following:
(a)
Endurance test (see 4.6.7.1).
(b)
Shock test (see 4.6.7.2).
(c)
Inclined operation test (see 4.6.7.3).
(d)
Vibration tests (if specified (see 6.2.1)) (see 4.6.7.4).
(e)
Experimental stress analysis (see 4.6.7.5).
4.6.7.1 Endurance test.  The pump shall be operated for a period of not
less than 500 hours of actual running time with a minimum of 100 starts to
ascertain reliability of performance and operation.
4.6.7.1.1 Prior to commencement of the endurance test and immediately
after completion of the 500-hour operating run, the pump shall be disassembled
to the extent necessary and the critical dimensions and running clearance of
parts subject to wear, erosion and derangement, shall be measured, calculated
and recorded.  Components such as pump impellers and casings subject to erosion,
corrosion, cavitation, and wear, the effects of which are not subject to routine
measurement,  shall be listed in the inspection record and after completion of
the test the condition of each component determined and recorded.
4.6.7.1.2 During the initial and final hours of the endurance test run,
noise and performance tests in accordance with 4.6.4 and 4.6.6.1 shall be
performed to determine the changes in the pump's performance characteristics
and noise signature.  Vibration measurements shall be taken at the bearing
caps or housings of the pump and driver at equal speeds during the initial and
final capacity test to determine the changes in mechanical operation.
4.6.7.1.3 The endurance test shall not be continuous but shall be inter-
rupted by at least three rest periods of a minimum of 8 hours each.  A minimum
of 100 starts at full line voltage shall be performed during the course of the
test.  The remainder of the endurance tests shall be run at maximum rated speed
and within plus 20F, minus 0F of maximum specified liquid temperature. The
pump shall be operated at one-third, two-thirds, and rated capacity in approxi-
mately equal time intervals.  Operations at rated capacity shall be at minimum
specified net positive suction head available, or maximum specified suction
lift or vacuum, as applicable.
4.6.7.1,4 The pump shall be monitored during the endurance test to
accurately record the conditions of operation, the capacity delivered, the
total head developed, the speed at which operated, and the general performance
observed.  Data shall be collected and the pump inspected at least twice per day
of operation.  For each periodic inspection, in addition to all measured data,
the record shall indicate the following:
47

Privacy Statement - Press Release - Copyright Information. - Contact Us

Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business