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.
4.6.5 Auxiliary-piping checklist
Precautions
CAUTION:
•
Risk of heat generation, seal failure, and possible physical injury. Sealing systems that
are not self-purging or self-venting, such as plan 23, require manual venting prior to oper-
ation.
•
Running a mechanical seal dry, even for a few seconds, can cause seal failure and physi-
cal injury. Never operate the pump without liquid supplied to the mechanical seal.
NOTICE:
Auxiliary cooling and flush systems must be operating properly to prevent excess heat genera-
tion, sparks, and/or premature failure. Ensure auxiliary piping is installed as specified on the
pump data sheet prior to startup.
When to install
You may need to install auxiliary piping for bearing cooling, mechanical seal flush, or other special fea-
tures supplied with the pump. Consult the pump data sheet for specific auxiliary piping recommenda-
tions.
Checklist
Check
Explanation/comment
Checked
Check that the minimum flow for each
component is 4 lpm | 1 gpm.
–
Check that the cooling water pressure
does not exceed 7.0 kg/cm
2
| 100 psig .
–
4.6.6 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 misalign-
ment.
If pipe strain exists, then correct the piping.
4.6 Piping checklists
36
3620 i-FRAME API type BB2 single stage / ISO 13709 2nd Ed/API 11th Ed Installation, Operation, and Maintenance
Manual
Содержание GOULDS PUMPS i-FRAME 3620
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