TURBINE DRIVEN BOILER FEED PUMP -ABC OF THERMAL POWER PLANT

Check clearances of Thrust bearing of BFP and Booster Pump-Feller Gauge / Dial Gauge.

Ensure specified clearances between guide slips & key (at the bottom of pump casing), and then 

welding of key block on base frame-Vernier/ Tape.

Hydraulic testing of coolers (waterside) - Pressure Gauge. should be calibrated

Note: Coolers if already hydro tested at manufacturing works and test certificates available, need not be hydro tested at site.

Completion of welding and NDE of welds of following lines:

a.   

       a       BFP discharge line.

.   b. BFP suction line.

c

.    c. Booster Pump Suction line.

d. 

     d.  Booster Pump discharge line

Ensure pre heat treatment and post-weld heat-treatment of weld

Ensure that the entire pipeline is supported by permanent supports before making the last four joints 

of  BOOSTER PUMP & MAIN PUMP suction and discharge.

Ensure that the piping doesn’t exercise any pull on pump nozzles. This is extremely important in the 

case of BFP suction & discharge, which are welded joints). This is true for any nay major or minor 

rotating machine . That means final connection to be done when  piping is in free float. This can be 

achieved  if all the pipelines are erected as per drawing and permanent supports are adjusted as per 

drawing value. In fact in BFP we check that pipe lines can be moved by hand only without any 

difficulty. Same philosophy is applicable for BOOSTER PUMP also . However BOOSTER PUMP 

connection is through fastners only therefore can be manipulated easily so not critical as MAIN 

PUMP. Instances are available that after final connection alignment was disturbed so much that 

pipeline was cut and re-weld after necessary correction. This area is major bone of contention 

between piping engineer and pump engineer.

Distances and alignment readings between coupling half faces of Booster Pump & Gear box, Gear

box & Drive turbine shaft, Drive turbine shaft & BFP after completing pipe connections.

Welding of key block on base frame after ensuring specified clearance between guide slips & key (At

the bottom of pump casing.

Small bore pipeline connection of oil lines of drive turbine , Cooler lines oil and water , Sealing lines

of pumps  Govering system installation and other steam lines to be connected and completed. Final

connection to be done after ensuring , oil flushing ,steam blowing ,water flushing ,chemical cleaning

etc is completed as per requirement under laid down procedure .Any short cuts will bring problems

afterwards .That is during stabilisation of units.

Necessary instrumentation on oil tank ,oil lines , bearings ,gear boxes and pumps are calibrated and

installed  as per drawing. Specially Turbovisory instruments for drive turbine , governing control

system are installed carefully.

PROCESS FOR PRE COMMISSIONING AND COMMISSIONING 

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continued to part -iii