Xylem A-C Fire Pump – Vertical Turbine Fire Pump AC8499 - Manual (Page 18)

18
Corrective Maintenance
Corrective maintenance procedures include troubleshooting for isolating and remedying malfunctions of the pump and its com-
ponents during operation.
TROUBLE PROBABLE CAUSE REMEDY
1. Pump does not start A. Electrical circuit open or not Check circuit and correct.
completed
B. Steam turbine not receiving Make sure that turbine receives
steam pressure full steam pressure.
C. Impellers binding against bowl Reset impeller adjustment
D. Low voltage supplied to Check whether driver wiring is
electric driver correct and receives full voltage.
E. Defective motor Consult factory.
2. No liquid delivered A. Insufficient submergence of Check for adequate submergence.
bowl assembly
B. Obstruction in liquid passage Pull pump, inspect impeller and bowl.
3. Not enough liquid A. Speed is too low Check if driver is directly across
delivered the line and receiving full voltage.
B. Wrong rotation Check for CCW rotation when
viewed from above. Check
engagement of motor coupling.
C. Total pump head is too high Check pipe friction losses.
Larger piping may correct condition.
D. Partial obstruction in liquid See step 2-B.
passages
E. Cavitation Insufficient NPSH available.
F. Impellers adjusted too high See pages 3-B.
4. Not enough pressure A. Speed is too low See step 1-B.
B. Obstruction in liquid Pull pump and inspect impeller
passages and bowl passages.
C. Wrong rotation See step 3-B.
TIME INTERVAL
PROCEDURE (in operating hours)
Clean dirt, oil and grease from driver and discharge head. As required.
Clean driver ventilation passage to prevent overheating. As required.
Change lubrication in gear drive. 2,000 or once a year
Change lubrication in thrust pot. See Section 13
Tighten all loose bolts, and check for excessive vibration. As required.
If packing is grease lubricated, add as required. 100
Check that there is some leakage through stuffing box while As required.
pump is in operation. Do not tighten gland nuts unless necessary.
Refer to Page 17 for tightening requirements.
Maintain a liquid film of lubrication between the seal rubbing faces.
As required.
Regrease motor bearings:
1800 RPM and above 1,000
Below 1800 RPM 2,000
Preventive Maintenance Procedures Thrust Pot