16
B1d.1
4/06
Supercedes 8/05
PACOPACO
PACOPACO
PACO
PUMPS
B. POSSIBLE CAUSES
1. The pump has not been properly bled of air.
2. The pump suction line has not been completely primed.
3. The suction head (NPSHR) required by the pump is too
high, or the net positive suction head available (NPSHA)
at your facility is too low.
4. The fluid pumped contains too much entrained air or
gas.
5. There are air pockets in the suction line.
6. An entry of air has suddenly occurred in the
suction line.
7. An entry of air past the shaft seal into the pump
has occurred.
8. The inlet of the suction line is insufficiently submerged.
9. The suction valve is closed or only partially open.
10. The suction strainer is clogged with dirt or debris.
11. The foot valve is clogged or undersized.
12. Little or no cooling fluid supplied to the shaft seals.
13. The lantern ring is not positioned opposite the
flushing inlet, thereby restricting fluid flow.
14. Pump drive rotational speed too low.
15. Pump drive rotational speed too high.
16. Pump rotation wrong or impeller installed back-
wards.
17. Total head of installation (back Pressure) higher
than rated total head of the pump.
18. Total head of installation (back Pressure) lower than
rated total head of the pump.
19. Density of fluid pumped differs from that specified
when the pump was purchased.
20. Viscosity of fluid pumped differs from that specified
when the pump was purchased.
21. The pump is operating at too low a rate of flow
(The discharge valve may be throttled too much).
22. If pumps are operating in parallel, the pump char-
acteristics may not be suitable for parallel operation.
23. The impeller may be clogged with debris.
24. The impeller may be damaged.
SYMPTOMS
CAUSE CODE
1*2*3*4*5*6*7*8*9*10*11*14*16*17*22*23*24*34
2*3*4*5*6*7*8*9*10*11*12*13*22*23*24*34
1*3*9*10*11*21*22*27*29*30*31*33*34*40*41
2*3*4*5*6*7*8*9*10*11*14*16*17*20*21*22*23*24*25*26*34
15*18*20*34
4*14*16*18*20*22*23*24*25*26*34
27*28*29*30*33*34*35*36*39*41
12*13*27*28*29*30*33*34*35*36*37*38*39*41
15*16*18*19*20*23*25*27*28*31*33*34*35*37*38*44
2*3*4*5*6*7*8*9*10*11*15*17*18*21*23*24*27*28*29*30*
31*32*33*34*40*41*42*45*46*
27*28*29*30*31*32*33*34*40*41*42*43*44*45*46
Pump does not deliver any liquid at start-up.
Pump stops delivering liquid after start-up.
Pump overheats and/or ceases to deliver liquid.
Insufficient flow rate.
Excessive flow rate.
Discharge pressure is too high.
Shaft seal leaks appreciably, or the packing leaks excessively.
Shaft seal or packing fails prematurely.
Pump uses too much power.
Pump runs rough and noisily.
Bearings overheat and/or fail prematurely.
VI. TROUBLE SHOOTING
A.
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