power plant boiler feed pump
DESCRIPTION
This deals with Boiler feed pumps used in power plants . contains details about the KHI and FK series pumps , technical parameters and maintenance prctices followed for these pumpsTRANSCRIPT
BEST PRACTICES FOR CONDITION MONITORING AND MAINTENANCE OF
BOILER FEED PUMP
V.GauthamBE Power NPTI
MBA SIMSREE(2014-16)
INTRODUCTION
Function of BFP – transport water from feed storage tank to boiler drum through H.P heater, F.R.S and economizer
Types of BFP – KHI and FK series
Need for maintenance
AIMS AND OBJECTIVES OF MAINTENANCE OF BFP
To maintain BFP at its maximum operating efficiency
To safeguard investment To help management in taking
decisions Make best use of resources. Maintain plant parameters
TECHNICAL DETAILS OF BFP
Pump type: FK 6D30 Flow rate: 398 cum/hr Speed: 5075 rpm Input Power: 2558 kw Efficiency: 81 % Min. RC flow: 100 tonnes/hr No. of stages: 6
BFP EXTERNALS
BFP INTERNALS
Maintenance
The BFP is a critical auxiliary which has to work continuously.
Maintenance types : Breakdown maintenance Preventive Reliability centered maintenance Condition monitoring Computer management maintenance
system(CMMS)
BREAKDOWN MAINTENANCE
Breakdown maintenance involves the repair or replacement of equipment and components after they have failed.
Activities which are undertaken when the BFP stops working come under breakdown maintenance
s.n Clearance between Clearance(in mm)
01.
0203.04.05.
06.
Impeller wearing-Casing wear ring/Diffuser wear ring.Balance drum-Restriction bush.Total axial float.Thrust/Axial bearing clearanceJournal bearing clearance (Top clearance)Interference of thrust collar & shaft
0.4
0.248.00.25 to 0.400.15 to 0.18
0.09
Preventive maintenance
It includes cleaning, inspection, oiling and retightening
It is the work done primarily to rectify the effects of normal wear in pump.
The usual intervals of preventive maintenance are:
Daily Monthly Quarterly Half yearly Annually
Predictive maintenance
It includes the following - Visual and sound monitoring Contaminant or debris monitoring Performance and behaviour monitoring thermograph monitoring Shock pulse monitoring. Vibration monitoring.
Vibration monitoring
COMPUTERIZED MAINTAINANCE MANAGEMENT SYSTEM
It is a type of management software that performs functions in support of management and tracking of operation and maintenance activities.
Historical tracking of all work orders generated which become sortable by equipment, date ,person responding etc.
Tracking of scheduled and unscheduled maintenance activities.
Storing of maintenance procedures as well as all warranty information by component.
Storing of all technical documentation or procedures by component.
CMMS BENEFITS
Detection of impending problems before a failure occurs resulting in fewer failures.
Achieving a higher level of plant maintenance activities that enables a more efficient use of staff resources.
Maintaining optimal equipment performance that reduces downtime and results in longer equipment life.
Shaft alignment
Shaft Alignment – Shaft alignment is the process of matching the centerline of two shafts. There is a one driving and another one is driven shaft.
Misalignment -It is the deviation in the centerline and plane of two shafts.
Radial misalignment Axial misalignment Combined misalignment
MotorPump
MotorPump
Axial or angular misalignment
Radial misalignment
Motor
Pump
Combined misalignment
Procedure for cartridge replacement
BFP PERMISSIVES
1. Deaerator level normal(2375mm).
2. BFP suction valve open.
3. Auxiliary oil pump on lube oil pressure more than 2.5 kg/cm2.
4. Discharge valve closed, recirculation valve open.
5. Working oil temperature less than 130˚C.
6. Differential temperature across feed pump suction and discharge less than 12˚C.
Boiler feed pump Log Book
TroubleshootingSr. no
Symptom Possible cause Action
1. Pump does not deliver rated quantity
•Pump not upto rated speed
•Restriction in delivery pipe work or incorrect
•Blockage in impeller or casing
•High fluid viscosity
• Increase speed
• Clear obstruction or rectify error in pipe work
• Remove half casing and clear obstruction
• Check the recommended viscosity
2. Bearing overheating
•Defect in lubricating oil system
•Bearing warn out of misaligned
•Misaligned of pump
•Check lubricating oil system (pr.>2.5kg/cm)
•Examine bearings
•Check the alignment
Thank You