Goulds Pumps 3600 - IOM - Manual (Page 32)

Installation
Discharge piping checklist
Checklist
Check Explanation/comment Checked
Check that an isolation valve is in- The isolation valve is required for:
stalled in the discharge line. • Priming
• Regulation of flow
• Inspection and maintenance of the pump
Check that a check valve is installed in The location between the isolation valve and the
the discharge line, between the isola-
pump allows inspection of the check valve.
tion valve and the pump discharge The check valve prevents damage to the pump and
outlet. 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.
If increasers are used, check that they —
are installed between the pump and
the check valve.
If quick-closing valves are installed in
This protects the pump from surges and water
the system, check that cushioning de- hammer.
vices are used.
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.
Auxiliary-piping checklist
Precautions
WARNING:
• Cooling systems such as those for bearing lubrication and mechanical-seal systems must be
operating properly to prevent excess heat generation, sparks, and premature failure.
• Sealing systems that are not self-purging or self-venting, such as plan 23, require manual venting
prior to operation. Failure to do so will result in excess heat generation and seal failure.
NOTICE:
The mechanical seal must have an appropriate seal-flush system. Otherwise, excess heat
generation and seal failure can occur.
When to install
You may need to install auxiliary piping for bearing cooling, seal-chamber cover cooling,
mechanical seal flush, or other special features supplied with the pump. Consult the pump data
sheet for specific auxiliary piping recommendations.
30 Model 3600, API 610 8th, 9th, 10th & 11th Editions (ISO 13709) Installation, Operation, and Maintenance Manual