Goulds Pumps 3298 - IOM - Manual (Page 37)

Installation
Example: Elbow close to the pump suction inlet
Correct Incorrect
The correct distance between the inlet flange of the
pump and the closest elbow is at least two pipe
diameters.
1. Enough distance to prevent cavitation
2. Eccentric reducer with a level top
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.
3298 Family Installation, Operation, and Maintenance Manual 35