Discharge Piping Checklist - Goulds Pumps 3700 Installation, Operation And Maintenance Manual

Installation
Example: Suction piping equipment
Correct
1. Suction pipe sloping upwards from liquid source
2. Long-radius elbow
3. Strainer
4. Foot valve
5. Eccentric reducer with a level top

Discharge piping checklist

Checklist
Check
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.
Check that a check valve is installed in
the discharge line, between the isola-
tion valve and the pump discharge
outlet.
If increasers are used, check that they
are installed between the pump and
the check valve.
If quick-closing valves are installed in
the system, check that cushioning de-
vices are used.
34 Model 3700, API Type OH2 / ISO 13709 1st and 2nd Ed. / API 610 8/9/10/11th Ed. Installation, Operation, and Maintenance
Incorrect
1. Air pocket, because the eccentric reducer is not
used and because the suction piping does not
slope gradually upward from the liquid source
Explanation/comment
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.
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.
See Example: Discharge piping equipment for
illustrations.
This protects the pump from surges and water
hammer.
Checked
Manual