Xylem G&L A-C 8100 Series Instruction Manual page 24

4 Installation
Check
(Optional) You can install a short section of
pipe adjacent to the suction flange such as
Dutchman or a spool piece that is designed
so that it can be readily dropped out of the
line.
Example of unbalanced loading
This figure shows the unbalanced loading of a double-suction impeller due to the uneven
flow around an elbow that is adjacent to the pump:
1. Pump casing
2. Impeller
3. Pump suction flange
4. Suction elbow
5. Water velocity increases here and causes a greater flow to one side of the impeller.
Figure 8: Unbalanced loading of double-suction impeller
Examples
1. Level centerline of pipe
2. Check valve
3. Gate valve
4. Increaser
Figure 9: Suction pipe installed with a gradual rise to the pump – correct
1. Air pocket
Figure 10: Suction pipe installed with a gradual rise to the pump – incorrect
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G&L Pumps Series A-C 8100 Base Mounted Centrifugal Pump INSTRUCTION MANUAL
Explanation/comment
This facilitates the cleansing of the liquid passage of
the pump without dismantling the pump. With this
arrangement, anything that clogs the impeller is
accessible with the removal of the spool piece or pipe
section.
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4
Checked
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