MIL-HDBK-1005/7A
5.2.3.6
Flexible Coupling . To relieve any strain transmitted
to the pumps and to take up misalignment, piping near pumps
should be provided with flexible couplings.
5.2.3.7
Vertical Pumps .
Design criteria for vertical pumps
are delineated below.
a)
Wet Pit or Well Submergence. Use the value
recommended by the pump manufacturer for operation at sea level
with water at 70? F, and adjust the value for elevation above
sea level and water above 70? F.
(1) Add 14 in. submergence for every additional
1,000 ft of elevation above sea level.
(2) Provide additional submergence for water
temperatures above 70 degrees F, as follows:
TEMPERATURE
ADDITIONAL SUBMERGENCE
degrees F
in.
80
4
90
10
100
17
110
26
120
38
130
54
140
74
150
100
160
125
170
160
180
205
190
250
200
300
b)
Vertical Booster Pumps. Vertical booster pumps
aid in reducing space and piping requirements. Direct-connected
and can -type units are suitable.
c)
Intake Sump Design. Provide bar racks and
screens to protect pumps, piping, valves, and fittings from
debris and aquatic life. Dimensions of the sump should be such
as to prevent vortex and turbulence, which are detrimental to
pump performance. Use the HI Hydraulic Institute Standards as
guides in design.
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