Fristam Pumps FP Series, Инструкция по эксплуатации и техническому обслуживанию, Страница: 26 / 32

Fristam FP/FPX Series Pump
26
S
UCTION
P
RObLEMS
1. Pump not primed
2. Pump or suction pipe not completely filled
with liquid
3. Suction lift too high
4. Insufficient difference between suction pres-
sure and vapor pressure (cavitation)
5. Too much air or gas in liquid
6. Air pocket in suction line
7. Air leaks into suction line
8. Air leaks into pump through seal
9. Foot valve too small
10. Foot valve partially clogged
11. Seal flush water not on
12. Water seal pipe plugged
13. Seal water flush pressure too high
M
EChANICAL
P
RObLEMS
14. Speed too low
15. Speed too high
16. Direction of rotation incorrect
17. Total head of system higher than design head
of pump
18. Total head of system lower than pump design
head
19. Specific gravity of liquid greater than ex-
pected
20. Viscosity of liquid greater than expected
21. Operation at very low capacity
22. Parallel operation of pumps unsuitable for
such operation
P
OSSIbLE
S
OLUTIONS
1a) Adjust piping so that pump is flooded
1b) Install a foot valve to keep liquid in the pump
2. Adjust piping so that suction pipe is filled
with liquid
3. Raise the level of the liquid, lower the level of
the pump
4. Use larger pipe on the inlet side of the pump,
raise the level of liquid above the pump center
line, lower the temperature of the liquid,
eliminate fittings in suction line if possible,
check inlet pipe for obstructions
5. Install air relief valve, turn pump head so
discharge is at 45 degree angle
6. Adjust pipe to eliminate pocket
7. Find and fix air leak
8. Check seal for proper installation, replace seal
if defective
9. Replace with larger foot valve
10. Clear obstruction from foot valve
11. Turn on water to seal flush
12. Clear obstruction from seal water pipe
13. Adjust water flow to seal flush to 1-2 gph at a
maximum of 5 psi.
14. Check electrical connections, consult motor
manufacturer
15. Check electrical connections, consult motor
manufacturer
16. On a three-phase motor, switch any two of
the three leads
17. Check for restrictions in the pipe, use larger
diameter pipe, use larger diameter impeller,
check application with Fristam Pumps
18. Install throttling valve in line, use smaller
diameter pipe, use smaller diameter impeller,
check with Fristam Pumps.
19. Use larger motor, check application with
Fristam Pumps.
20. Use larger motor, use larger diameter pipe,
check application with Fristam Pumps.
21. Install throttling valve
22. Replace parallel pumps with a single larger
pump