Bypass-Piping Considerations - ITT GOULDS PUMPS ICO i-FRAME Installation, Operation And Maintenance Manual

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Check
If quick-closing valves are installed in the
system, check that cushioning devices are
used.
Example: Discharge piping equipment
Correct
4
3
1.
Bypass line
2.
Shut-off valve
3.
Check valve
4.
Discharge isolation valve

4.6.5 Bypass-piping considerations

When to use a bypass line
Provide a bypass line for systems that require operation at reduced flows for prolonged periods. Connect
a bypass line from the discharge side (before any valves) to the source of suction.
When to install a minimum-flow orifice
You can size and install a minimum-flow orifice in a bypass line in order to prevent bypassing excessive
flows. Consult your ITT representative for assistance in sizing a minimum-flow orifice.
When a minimum-flow orifice is unavailable
Consider an automatic recirculation control valve or solenoid-operated valve if a constant bypass (mini-
mum-flow orifice) is not possible.
Model ICO i-FRAME, ICOH i-FRAME Installation, Operation, and Maintenance Manual
Explanation/comment
This protects the pump from surges and water hammer.
1
2
Incorrect
1
2
1.
Check valve (incorrect position)
2.
The isolation valve should not be positioned be-
tween the check valve and the pump.
4.6 Piping checklists
Checked
41

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