SAMCO CP7, Instructions Manual

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symptoms are listed below. Correct any trouble immediately and AVOID COSTLY REPAIR AND
SHUTDOWN.
No liquid delivered
CAUSES CURES
1. Lack of prime. Fill pump and suction pipe completely with liquid.
2. Loss of prime.
Check for leaks in suction pipe joints and fittings; vent casing to
remove accumulated air.
3. Suction lift too high.
If no obstruction at inlet, check for pipe friction losses. However,
static lift may be too great. Measure with mercury column or
vacuum gauge while pump operates. If static lift is too high, liquid
to be pumped must be raised or pump lowered.
4.
Discharge system head too
high. Check pipe friction losses. Larger discharge piping may correct
condition. Check that valves are wide open.
5. Speed too low.
Check whether motor is directly across the line and receiving full
voltage. Or frequency may be too low; motor may have an open
phase.
6.
Wrong direction of rotation.
Check motor rotation with directional arrow on pump casing. Wrong
rotation will cause pump damage.
7.
Impeller completely
plugged.
Dismantle pump or use piping handhole to clean impeller.
Not Enough Liquid Delivered
8. Air leaks in suction piping.
9. Air leaks in stuffing box.
10. Speed too low.
11. Discharge system head
too high.
12. Suction lift too high.
13. Impeller partially
plugged.
If liquid pumped is water or other non explosive, and explosive gas
or dust is not present, test flanges for leakage with match or flame.
For such liquids such as gasoline, suction line can be tested by
shutting off or plugging inlet and putting line under pressure. A
gauge will indicate a leak with a drop of pressure.
Increase seal lubricant pressure to above atmosphere.
See item 5.
See item 4.
See item 3.
See item 7.