TURBINE DRIVEN BOILER FEED PUMP COMMNG PART-I-ABC OF THERMAL POWER PLANT

PART-I

Before starting the pre-commissioning activities of BFP ( TD – TURBINE DRIVEN)  equipments need to be individually checked for readiness upto a limit point.

Booster pump, Gearbox, Turbine, BFP and associated system are erected as per recommended drawing and readings are recorded for ready reference.

Acid cleaning and oil flushing completed for lube oil and working oil, Jacking oil and governing oil piping as per test procedure and lines are normalized. The procedure has already been discussed in my earlier blogs.

Detergent flushing of feed water suction, discharge and recirculation piping are completed and all piping normalized. These flushing is being done in parts as MDBFP comes first at initial stage that time pipelines for TDBFP may not be ready. Therefore a scheme to be made to undertake this job without interrupting the commissioning activities. This should be kept in mind. Otherwise to complete the line and do the cleaning in one go is the best.

All piping supports are loaded to the rated value and all temporary supports removed from the pipeline.

Deaerator and FST filled with Fresh DM water. FST level switches and Deaerator level switches are checked. In fact these switches are calibrated during MDBFP trial run. Rechecked during TDBFP commissioning.

Flushing of following pipe lines completed.

Cooling water lines of Booster pump and BFP (Seal Water cooler and seal body)

Balancing leak off lines of main pump.

Turbine exhaust hood spray line.

Turbovisory instruments  for turbine ( i.e expansion measurement of turbine  

Vibration , temperature ,pressure etc calibrated and installed .

Steam blowing of pipelines again in phased manner is to be completed. It is noticed that steam lines of TDBFP are not get ready during steam blowing activity of the unit. This is to be done at later date therefore a scheme of drawing steam and drain to condenser /flash tank to be made and executed as per the scheme.

Insulation of turbine and pipelines is completed.

Erection of gland steam supply piping complete. Supports, steam blowing and insulation complete.

Turbine drain piping and all steam piping drain lines are complete. For initial rolling orifice plates in drains are removed to avoid chocking.

Turbine exhaust piping complete with supports upto condensor.

Bursting diaphragm is erected and healty.

Gland leak off piping erection complete to condensor (including supports and insulation)

All motorized valves related to turbine including live steam isolation valves, turbine drain valves are commissioned.

Gland steam pressure controller commissioned available for operation.

Governing valves erected and protection devices like overspeed trip device, hand trip device are mounted properly.

Feed water suction strainer erected in position in clean condition with DP indicator commissioned.

Instrument and service air line for the Feed pump system erected and the air is made available for operation.

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CONTINUED TO PART-II