Goulds Pumps SRL Series - IOM - Manual (Page 18)

Page 4
NO LIQUID OR NOT ENOUGH LIQUID
DELIVERED
1. Lack of prime.
Fill pump and suction completely with slurry. Check for
vapor bind.
2. Speed too low.
Check whether motor is wired correctly and receiving full
voltage across each phase. If frequency is too low, motor may
have an open phase. Check V-Belt tension. Check sheave
diam e ters.
3. Discharge head too high.
Check pipe fric tion losses. Larger piping may correct condi tion.
Are valves wide open?
4. Suction lift too high.
Check for pipe fric tion losses as static lift may be too great.
Measure with mercury column or vacuum gauge while pump
oper ates. If static lift is too high, liquid to be pumped must be
raised or pump lowered.
5. Impeller completely or partially plugged.
Dismantle pump and clean impeller.
6. Obstruction at inlet.
Check and remove.
7. Defective packing
Replace packing and sleeve if badly worn.
NOT ENOUGH PRESSURE
8. Speed too low.
See item 2.
9. Obstruction in liquid passages.
Dismantle pump and inspect passages of impeller and casing.
Remove obstruc tion.
INCONSISTENT OPERATION
10. Incomplete priming.
Free pump, pip ing and valves of all air. If high points in
suc tion line pre vent this, they need cor rect ing. See Suc tion
Pip ing on page 2.
11. Suction lift too high.
See item 4.
12. Stuffing box too tight.
Release gland pres sure. Tighten reason ably. If sealing water
does not flow while pump oper ates, replace packing. Check
shaft or shaft sleeve for scoring, replace if neces sary. Always
have slight leakage from packed stuffing box.
13. Casing distorted by excessive strains from suction or
discharge piping.
Examine pump for rubbing between impeller and casing;
replace damaged parts.
14. Shaft bent due to thermal distortion, damage during
overhauling, or improper assembly of rotating element.
Check run-out by turning between lathe centers. Total run-out
should not exceed .002" on all pumps.
15. Mechanical failure of critical pump parts.
Check bear ings, and impeller for damage. Any irreg u larity in
these parts will cause a drag on the shaft.
MOTOR OVERLOADS
16. Liquid heavier (in specific gravity) than allowed for.
U s e l a r g e r d r i v e r . C o n s u l t p u m p m a n u f a c t u r e r for
recom mended size. Test liquid for specific gravity.
17. Speed may be too high (Brake HP of pump varies as the
cube of the speed); therefore, any increase in speed means
considerable increase in power demand.
Check voltage on motor.
HOW TO REMEDY PUMP TROUBLES
•
FIND TROUBLE IN HEADING BELOW
. . . . . . . .
•
CHECK CAUSES . . . . . . . . . . . . . . . . . . . .
•
FOLLOW SUGGESTED CURES . . . . . . . . . . .
EXAMPLE
NO LIQUID DELIVERED
1. Lack of prime. Fill pump and suction completely
with slurry. Check for vapor bind.
LOCATING TABLES