BOILER FEED PUMP
OPERATING INSTRUCTIONS 1. INTRODUCTION
8. FAULT FINDING
Symptom Possible Cause Action
(1) Pump fails to start.
(a) Driving motor fault Check motor
(b) Power supply fault. Check motor Breaker.
Symptom Possible Cause Action
(c) Seizure of Pump set. Disconnect couplings and locate seizure. Overhaul as necessary
(d) Deaerator level low-low
Check deaerator water level switches & gauge glass for any Blockage.
(e) Pump set tripped. Investigate cause.
Reset trips.
(a) Driving motor faculty Check operation of motor.
(b) Incorrect rotation Check motor electrical connections.
(c) Booster stage pump faculty.
Check booster stage pump (Refer to part 1, chapter 2).
(d) Excessive wear of pump internals
Dismantle pump and inspect components.
(e) Low Speed Check Speed Regulation
System
(f) Strainer Chocked Clean strainer.
(3) Bearings overheating.
(a) Defect in lubricating oil system.
Check lubricating oil system.
Oil flow to bearing. (Refer to manufacturer’s instructions in
(4) Mechanical Seal Temperature high
(a) Insufficient cooling
Water to cooler.
Check Heat Exchanger for blockages and clean.
(5) Excessive noise and/or vibration
(a) Misalignment of pump set.
Check alignment (b) Bearing misalignment Examine bearings.
(c) Holding down bolts loose.
Tighten holding down bolts.
And maintain Dim as per Drg.
(d) Excessive clearance of pump internals.
Check clearances overhaul as necessary.
(e) Rotating assembly out of balance.
Check dynamic balance.
(f) Excessive piping loads acting on pump
branches.
Check piping support and re-adjust.
(g) Hydraulic Flow
Disturbances
Increase flow through pump.
Avoid long runnings on low flows.
b) Opening casing drain &
R.C. line drains.
(c) Mal-Operation of
Instruments.
c) Check RTD & diff temp.
switches.
(7) H.C. Fusible plugs blown - off
(a) Entrap-off foreign particles between pump internals or pump seizure
a) Check pump freeness/
rotation. If hard, open and inspect pump internal.
SECTION - B BOILER FEED PUMP
CHAPTER – 3
MAINTENANCE INSTRUCTIONS
LIST OF CONTENTS
1 Introduction
1.1 Periodic and preventive maintenance
1.2 Routine checks
2 Maintenance particulars
2.1 Estimated weights
2.2 Joints
2.3 Recommended torque values for
threaded fasteners
2.4 Recommended lubricants
3 Maintenance Procedures
3.1 Preparation for maintenance
3.2 Examining the drive end journal and thrust bearing.
3.3 Examine the non-drive and journal and thrust bearing.
3.4 Checking the axial running position and thrust bearing clearance.
4 Overhaul 4.1 Preparation for overhaul
4.2 Withdrawing the pump cartridge 4.3 Dismantling the pump cartridge 4.4 Inspection, renewal and repair
procedures
4.5 Assembling the pump cartridge 4.6 Installing the pump cartridge
4.7 Final assembly
5 Parts Identification
CHAPTER – 3
MAINTENANCE INSTRUCTIONS
1. INTRODUCTION :
It is recommended that a system of routine inspection be established during which the condition of the pump can be determined and recorded for comparison with later inspections. Any defects should be repaired or the components renewed at the earliest opportunity. Certain inspections can only by made when the pump is under shut down but others can be made under operating conditions.
A high degree of cleanliness of each pump and of the surrounding areas should be maintained, as this will assist in the early detection of minor leaks or defects which, if unnoticed, could lead to more serious operational or maintenance problems.
1.1 Periodic and Preventive Maintenance
The pump performance should be used as the criterion for the need to renew wearing parts. The pump performance may deteriorate due to excessive leakage past the impeller/diffuser wear rings or vibration may indicate that the wear rings or bearings are worn.
Note: The recommended renewal clearances are 1.5 times the clearances shown on the Sectional Arrangement Drawings. If the pump performance has declined it may be necessary to renew the wearing parts before the recommended clearances are reached.
1.2 Routine Checks
It is essential that the routine checks given in Chapter-2, Section-5 are carried out regularly. The checks concerned with the mechanical condition of the pump are repeated here for the convenience of the maintenance engineers.
1.2.1 Periodic Checks
It is recommended that the following checks are carried out at regular intervals :-
(1) Check that the suction and discharge pressures are normal.
(2) Check that the pump bearing lubricating oil pressures and temperatures are normal.
(3) Check for any leakage from the mechanical seals.
(4) Check all joints and valve glands for leakage.
(5) Check for any undue noise or vibration.
(6) Carryout a visual check on all keeps and fastenings, paying particular attention to the holding-down bolts.
2. Maintenance particulars
2.1 Estimated Weights (for lifting purposes)
Item Weight, kg
Cartridge assembly 1752
Discharge cover 1200
Suction guide 216
Pump shaft 303
Ring section, 1st stage 138
Ring section, 2nd / 3rd stage 144
Ring Section, last stage 131
Diffuser 48.5 Bottom bearing housing, drive end 55
Top bearing housing, drive end 85
Bottom bearing housing, non-drive end 145 Top bearing housing, non-drive end 91.5
Thrust bearing cover 30.5
Thrust collar 28.8
Balance drum 33
Gland housing 191
2.2 Joints
All the various types of joints, CAF, Metaflex etc. used on the pumps, are to be found in the parts lists on sectional assembly drawings.
2.3 Recommended Torque Values for Threaded Fasteners
The following torque figures must be used when assembling the pump. All threads and undersides of heads must be lubricated.
Threaded Fastener Recommended Torque (Nm)
Pull up rings screws 175
Gland housing/discharge cover screws
430
Diffuser Screw 40
Last stage diffuser screws 40
Thrust collar nut 2850
Ring section screws 95
2.4 Recommended Lubricants
This lubricating oil for the journal and thrust bearings of the Booster and Boiler feed pumps will be supplied from the lubricating oil system associated with the turbo coupling.