2.2
SUBMERSIBLE PUMP
2.2.1
Design and Manufacture
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NOTE: The Contractor is required to submit names of
previous installations where the selected
manufacturer has documented the operating
performance for pumps of this design. While the
general venturi configuration of the pumps built by
different suppliers is similar, the details (e.g.,
number of bearings, wearing ring design, cast versus
fabrication, impeller design, and materials) can be
different. Based on design details available, there
seems to be little justification to prefer one
manufacturer's design over another. The pump
portion of the specification is a low tech design
compared with the motor and housing internal design,
70 to 80 percent of the cost may be contained in the
motor. The emphasis on the pump portion should be
on rugged, reliable, long-lasting components that
are trouble-free.
The design elements described in this section are
taken from drawings, manuals, catalogs, and
brochures requested from two manufacturers, one
domestic and one foreign. Both have over 30 years
of experience and thousands of operating pumps
worldwide. A primary concern in the specification
was to not make it restrictive and yet to ensure
that only qualified manufacturers would respond.
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At the Contractor's option, the submersible pump may be either of cast or
fabricated construction. The level of manufacture skill shall be
consistent with the standards referenced in the specifications. All work
performed in the manufacture of the pumps shall be performed in a skillful
and workmanlike manner in accordance with the best modern shop practice and
manufacture of finished products similar in nature to those specified
herein. The Government reserves the right to observe and witness the
manufacture of the pumps and to inspect the pumps for compliance with
contract requirements during factory assembly.
2.2.2
Speed
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NOTE: HI 2000 bases the maximum operating pump
speed calculations on a value of suction-specific
speed of 8500. EM 1110-2-3105, Appendix B uses
8000. When calculating the maximum specified pump
speed use the more conservative value of
suction-specific speed for application where pumps
will operate continuously or for extended periods of
time above or below point of optimum efficiency.
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2.2.2.1
Pump Speed
Rotative speed of the pump shall not be greater than [_____] rpm.
SECTION 15132A
Page 19
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