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SCREENING
Make provisions for the installation of a suction screen or strainer to prevent any debris from
clogging the impeller. The open area of the strainer should be equal to at least four (4) times
the area of the pipe. The screen should be rigid enough to prevent collapse when flow is
reduced due to clogging.
SUMP DESIGN
The submergence of the suction pipe into the liquid should be at least four (4) to five (5) times
the pipe diameter. If this is not possible then provide a baffle or a floating board. This is to
prevent any vortex action allowing air into the pipe. For best performance a bell mouth fitting
is recommended. Recommended pipe submergences for various flows as well as recommended
bell diameters are shown in the table below whose data was taken from ANSI/HI 9.8-1998.
FLOW (GPM)
SUBMERGENCE WITH BELL (FT)
Bell Diameter (in)
Submergence (FT)
SUBMERGENCE WITHOUT BELL (FT)
PIPE ID (in)‐ No Bell
3
4
6
8
10
LIFTING
Any lifting equipment is to be rated for at least five (5) times the weight of the item being
lifted. Use only established methods when lifting or moving any heavy components.
ALIGNMENT OF PUMP AND MOTOR
Precise alignment is mandatory to achieve correct performance of the system. Every time a
component is moved this alignment will have to be checked. The alignment can be checked
with a straight edge and an outside caliper, taper thickness gauge, dial indicators, or for best
results, use a laser alignment tool. Use the straight edge across the outside diameters of the
coupling to ensure that the two halves are concentric and parallel. The outside calipers or the
taper thickness gauge is to correct for any angular misalignment and to verify the correct gap
between the coupling flanges. Use a laser alignment tool or dial indicators to adjust for
concentric and angular displacement. With dial indicators, rotate shafts together and take
readings every ninety (90) degrees. Make adjustments by placing shims under the driver, and
be sure that the mounting bolts are properly tightened while taking readings and after final
adjustment then install coupling guard.
500 1000 1500
2000
6.1
8.6
10.6
12.2
2.1
2.6
3.0
3.3
SUBMERGENCE WITHOUT BELL (FT)
4.7
3.3
6.3
2.1
3.7
5.3
1.7
2.8
3.8
4.9
1.6
2.3
3.1
3.8
2500
3000
3500
4000
13.6
14.9
16.1
17.2
3.5
3.7
3.9
6.0
4.6
5.4
6.1
4500
18.3
4.1
4.3
6.9
7.6
9
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