Example: Suction piping equipment
Correct Incorrect
1. Suction pipe sloping upwards from liquid source
2. Long-radius elbow
3. Strainer
4. Foot valve
5. Eccentric reducer with a level top
1. Air pocket, because the eccentric reducer is not
used and because the suction piping does not
slope gradually upward from the liquid source
Discharge piping checklist
Checklist
Check Explanation/comment Checked
Check that an isolation valve is
installed in the discharge line.
The isolation valve is required for:
• Priming
• Regulation of flow
• Inspection and maintenance of the pump
See Example: Discharge piping equipment for
illustrations.
Check that a check valve is installed in
the discharge line, between the
isolation valve and the pump
discharge outlet.
The location between the isolation valve and the
pump allows inspection of the check valve.
The check valve prevents damage to the pump and
seal due to the back flow through the pump, when
the drive unit is shut off. It is also used to restrain
the liquid flow.
See Example: Discharge piping equipment for
illustrations.
If increasers are used, check that they
are installed between the pump and
the check valve.
See Example: Discharge piping equipment for
illustrations.
If quick-closing valves are installed in
the system, check that cushioning
devices are used.
This protects the pump from surges and water
hammer.
Installation
38 Model 3196 i-FRAME Installation, Operation, and Maintenance Manual
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