Installation
Model 710 TruBlue Installation, Operation, and Maintenance Manual
32
Check
Explanation/comment
Checked
If quick-closing valves are installed in
the system, check that cushioning de-
vices are used.
This protects the pump from surges and water
hammer.
Example: Discharge piping equipment
Correct
Incorrect
1.
Bypass line
2.
Shut-off valve
3.
Check valve
4.
Discharge isolation valve
1.
Check valve (incorrect position)
2.
The isolation valve should not be positioned
between the check valve and the pump.
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 (minimum-flow orifice) is not possible.
Final piping checklist
Check
Explanation/comment
Checked
Check that the shaft rotates smoothly.
Rotate the shaft by hand. Make sure there is no
rubbing that can lead to excess heat generation or
sparks.
Re-check the alignment to make sure
that pipe strain has not caused any
misalignment.
If pipe strain exists, then correct the piping.
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