ITT Goulds Pumps XHD, Инструкция по установке, эксплуатации и обслуживанию

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Installation
XHD Installation, Operation, and Maintenance Manual 37
Example: Suction piping equipment
Correct Incorrect
1. Suction pipe sloping upwards from liquid source
2. Long-radius elbow
3. Strainer
4. Foot valve
5. Eccentric reducer with a level top
NOTICE: This illustration shows correctly installed
equipment for the suction piping.
1. Air pocket, because the eccentric reducer is not
used and because the suction piping does not
slope gradually upward from the liquid source
NOTICE: This illustration shows incorrectly installed
equipment for the suction piping.
Discharge piping checklist
Checklist
Check Explanation/comment Checked
Check that an isolation valve is in-
stalled in the discharge line. For specif-
ic gravity less than 0.60, minimize dis-
tance from pump discharge. The isolation valve is required for:
• Priming
• Regulation of flow
• Inspection and maintenance of the pump
• Reduce risk of pumpage vaporization and
vapor locking at low flow rates for low specific
gravity liquids.
See Example: Discharge piping equipment for
illustrations.
Check that a check valve is installed in
the discharge line, between the isola-
tion valve and the pump discharge
outlet. The location between the isolation valve and the
pump allows inspection of the check valve.
The check valve prevents damage to the pump
and 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.
See Example: Discharge piping equipment for
illustrations.
If increasers are used, check that they
are installed between the pump and
the check valve. See Example: Discharge piping equipment for
illustrations.
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.