Flo Fab 880RI Series, Руководство по эксплуатации, обслуживанию и установке, Страница: 13 / 41

SINCE 1981
(SEE KEY IN THE NEXT PAGE)
12
SUCTION TROUBLES
1. Pump not primed.
2. Pump or suction pipe not
completely filled with liquid.
3. Suction lift too high.
4. Insufficient margin
between suction pressure
and vapor pressure
(available NPSH too low).
5. Excessive amount of air
or gas in liquid.
6. Air pocket in suction line,
7. Air leakage into s uction
line.
8. Air leakage into pump
through stuffing boxes.
9. Foot valve t
oo small.
10. Foot valve pa rtially clog-
ged.
11. Inlet of suctio n pipe in-
sufficiently submerged,
12. Water s
eal pipe plugged.
13. Seal cage i mproperly
located in stuffing box, pre -
venting sealing fluid entering
space to form the seal.
SYSTEM TROUBLES
14. Speed too low.
15. Speed too high.
16. Wrong direction of rota
-
tion.
17. Total head of system hi -
gher than pump design head.
18. Total head of syste m lower
than pump design head.
19. Specific gravity of li quid
different than design.
20. Viscosity of liquid differs
from that for which designed.
21. Operation at very low ca-
pacity.
22. Parallel operation of
pumps unsuitable for such
operation.
MECHANICAL
TROUBLES
23. Foreign matter in impel -
ler.
24. Misalignment.
25. Foundation not rigid.
26. Shaft bent.
27. Rotating part rubbing o
n
stationary part.
28. Bearing worn .
29. Wearing rings worn.
30. Impeller damaged.
31. Casing gasket defective,
permitting internal leakage.
32. Shaft or shaft slee -
ves worn or scored at the
packing.
33. Packing improperly ins-
talled.
34. Incorrect type of packing
for operation conditions.
35. Shaft running off-cen ter
due to worn bearings or mi-
salignment.
36. Rotor out of balance re-
sulting
in vibration.
37. Gland too tight, resul -
ting in no Flow of liquid to
packing.
38. Failure to provide cooling
liquid to water-cooled stuffing
boxes.
39. Excessive clearance
at bottom of stuffing box
between shaft and casing,
causing packing to be forced
into pump interior.
40. Dirt or grit in sealing
liquid, leading to scoring of
shaft or shaft sleeve.
41. Excessive thrust caused
by a mechanical Failure
inside the pump or by the
failure of the hydraulic balan-
cing device, if any.
42. Excessive a mount of
grease or oil in the housing
of on antifriction bearing or
lack of cooling, causing ex -
cessive bearing temperature.
43. Lac k of lubrications.
44. Improper installation
of antifriction bearings
(damage during assembly).
45. Dirt getting
into bearings.
46. Rusting of bearings due
to water getting into housing.
47. Excessive cooling of
waler-cooled bearing resul-
ting in condensation in the
bearing housing of moisture
from the atmosphere.
KEY
I.O.M - 880RI SERIES
IOM 880RI.indd 13 2017-11-14 13:04:06