Goulds Pumps 3700 - IOM - Manual (Page 34)

Installation
Example: Suction piping equipment
Correct Incorrect
1. Suction pipe sloping upwards from liquid source 1. Air pocket, because the eccentric reducer is not
2. Long-radius elbow used and because the suction piping does not
3. Strainer slope gradually upward from the liquid source
4. Foot valve
5. Eccentric reducer with a level top
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
See Example: Discharge piping equipment for
illustrations.
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.
See Example: Discharge piping equipment for
illustrations.
If increasers are used, check that they See Example: Discharge piping equipment for
are installed between the pump and
illustrations.
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.
32 Model 3700, API Type OH2 / ISO 13709 1st and 2nd Ed. / API 610 8/9/10/11th Ed. Installation, Operation, and Maintenance
Manual