PART -II ( TDBFP COMMNG)
Continued from PART-I
All local and remote
instrumentation for the system is complete.
Insulation of the
following completed.
a) Re-circulation line of main pump.
b) Suction and discharge line of booster pump and main pump.
c) Main pump and booster pump body.
Commissioning of valves
related to the feed pump system are completed. (Suction isolating valve,
discharge isolating valve, re-circulation valve and motor cooling water
isolating valve etc)
All instrumentation local
,remote completed , and also Interlock and protection system simulation
checking completed.
Commissioning
of Oil System and Turning Gear Operation of BFP Turbine( BHEL make)
Oil flushing of lubrication
oil system completed and lines are
normalized. ( note:- temporary pipes ,bends etc removed kept it for use of next pump oil flushing next pump
Turbine is disconnected
from gear box and main pump and kept in isolation.
Completion of lube oil
inlet lines with throttles / orifices pressure gauges and return lines with
view glass and temperature gauges.
Check healthiness of
bearing metal temperature detectors of turbine, main pump and booster pump. (
In general we use Platinum RTD ( 100 ohm 0 degree or Ni-Cr-Ni thermo-couple
4.12mv/100 deg increase.) therefore as per visual check with a meter all will
show room temperature.
Ensure proper mounting of
speed probes and turbine supervisory probes ( axial shift , thermal expansion , overall
thermal expansion with dowelling after necessary calibration.)
Ensure the completion of
Jacking Oil of lines with throttle valve, NRV ( non return valve) and isolating valve.
Ensure healthy filter
elements in MOP, AOP, EOP suction lines, MOP, AOP and EOP discharge lines and
JOP suction line.
Oil is filled in MOT
through centrifuge to adequate level. ( Servo prime 46 or equivalent from any
other company.)
Keep open the vents of
lube oil coolers and filter to purge air from the system.
Keep the changeover valve
of lube oil cooler and filter in such a way that only one cooler ad filter will
be in service.
Drains of lube oil
coolers, filters should be in closed position to avoid any loss of oil..
Start one of the oil
vapour fans with its suction valve open condition.
Start one of the lube oil
pumps ensuring flow through recirculation.
Adjust lube oil header
pressure control valve to maintain lube oil pressure of 2.5 kg/cm2 ( approx) after
control station.
Adjust lube oil discharge
pressure to 10.0kg/cm2(approx) by setting re-circulation control valve.
By operating isolating
valve of recirculation control valve, check the safety valve popping and adjust
if required.
Check the lube oil flow
to the bearing of turbine, main pump and booster pump.
Monitor lube oil duplex
filter DP.
Stop the pump and start
other lube oil pump and check its discharge safety valve popping and adjust if
required.
Stop running pump and
start DC EOP. ( Emergency Oil Pump).
Ensure adequate lube oil
pressure and flow. Keep DC EOP running for 4 hours to check the healthiness of
the system with EOP.
Stop DC EOP and keep lube
oil pump in service .
Charge the suction line
of JOP from lube oil header.
Start JOP and adjust the
safety relief valve to 110 kg/cm2.
Adjust pressure
regulating valve to 100 kg/cm2
Adjust the throttle
valves in Jacking oil supply to front and rear journal bearings such that the
rotor lifts around 0.05 to 0.1 mm. Stop JOP and start again. Check and record
the Jacking oil pressures and rotor lifts in the turbine front and rear journal
bearings.
Check and ensure the
freeness of rotor for rotation by engaging hand barring lever and then stop
JOP.
Ensure auto operation of
AOP I, AOP II and DC EOP through corresponding pressure switches operation. (
Part of protection checking and auto operation) . Cut in of DCEOP in emergency
is most important aspect.
Keep AOP I in service, AOP II and EOP on auto.
Oil temperature is above 40 degree C .
Charge cooling water to
cooler and ensure oil temperature control valve auto operation.
Start JOP and open
turning gear valve.
Once the rotor picks up
speed, turning gear valve may be closed for checking the rotor for possible
rubbing at end gland seals, heat shields, oil gaurds etc., while coasting down.
If the rotor is found
smooth till it comes to standstill, turning gear valve may be opened full.
Turning gear speed of
around 200 RPM and smooth running.
Observe and record
bearing metal temperatures, vibrations, eccentricity etc.and run for 8 hours.
stop turning gear and observe coasting down etc,
MOP = MAIN OIL PUMP
AOP = AUXILIARY OIL PUMP
JOP = JACKING OIL PUMP
DC EOP = EMERGENCY OIL PUMP ( DIRECT CURRENT)
CONTINUED TO PART -III
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