EM 1110-2-3102 and EM 1110-2-3105. Using the data
from hydrology and hydraulic studies, the designer
will establish the performance requirements of the
pumps. Using the manufacturers' catalogs that
tabulate the characteristics of their pre-engineered
units, a pump will be selected. The designer should
then locate other pumps with the described
characteristic and establish contact with
manufacturers.
Any pump selected results from careful analysis of
the relationships of speed, net positive suction
head (NPSH) (cavitation), head-capacity, range of
plant operation, sump design requirement, and to a
lesser extent, efficiency. During the selection
process the manufacturer's input to the design is
obtained and integrated into the selection.
The specification will then state specific values to
be attained so that a pump with the desired
performance can be obtained. It is necessary to
state the requirements so that more than one
manufacturer can respond. All manufacturers must
meet the previous experience and manufacturing
standards requirements.
Compliance with the performance requirements will be
established using procedures stated in the HI
Standards and at the time when the pump is assembled
and tested at the factory. Efficiency, heads, and
other hydraulic values for purpose of specification
should conform to HI definitions, even though Corps
manuals are used for the purpose of design criteria.
Each pump installation will be uniquely different
and may require a slightly different head-capacity
specification to establish that the correct pump
will be obtained. During the pump selection
procedure, the designer will establish certain
capacities that must be met over a range of heads.
The designer may state more than one operating point
on the performance curve or utilize different points
on the curve such as rated head, design head best
efficiency point (BEP), maximum head, and minimum
head. The heads defined are as stated in EM
1110-2-3105.
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a. [Discharge shall not be less than [_____] l/s gpm against total
design head [_____] m ft with water surface in the sump at elevation
[_____] m. ft.]
b. [Discharge shall not be less than [_____] l/s gpm against total
rated head [_____] m ft with water surface in the sump at elevation
[_____] m. ft.]
c. [The pump shall deliver a minimum capacity of [_____] l/s gpm at a
total minimum head of [_____] m, ft, plus pump losses with water
surface in the sump at elevation [_____] m. ft.]
SECTION 15132A
Page 14
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