Goulds Pumps 7200CB - IOM - Manual (Page 33)

Installation
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.
Checklist
Check Explanation/comment Checked
Check that the minimum flow for –
each component is 1 gpm (4 lpm).
If the bearing and seal chamber
cover cooling are provided, then
the auxiliary piping must flow at 2
gpm (8 lpm).
Check that the cooling water pres- –
sure does not exceed 100 psig
(7.0 kg/cm
2 ).
Final piping checklist
Check Explanation/comment Checked
Check that the shaft rotates Rotate the shaft by hand. Make
smoothly. sure there is no rubbing that can
lead to excess heat generation or
sparks.
Re-check the alignment to make If pipe strain exists, then correct
sure that pipe strain has not the piping.
caused any misalignment.
Model 7200CB, API Type BB5 Barrel Multistage / ISO 13709 2nd Edition / API 610 11th Edition Installation, Operation, and 31
Maintenance Manual