TG Oil Flushing Procedure

TG OIL FLUSHING PROCEDURE

PURPOSE:

• · This document is prepared to guide the operation personnel to line up  for Lub oil Flushing  and achieve desired oil Parameters
  

SCOPE:  

• · This shall be applicable to the MOT Lub oil system of Stage-1 (210 MW*4) & Stage-2 (490MW*2)
  

PRECONDITIONS OF STARTING TG LUB OIL FLUSHING

S No	ACTIVITY	Responsibility	Status
1.	Ensure MOT inspection & Pedestal closing clearance and Lub oil flushing Clearance from TMD and C&I.	Operation
2	MOT Drain, Coolers drains and filters drain and vents are closed	Operation
3	MOT  level is >Low and <High	Operation
4	All Instruments root valves are charged, & all instruments are healthy	C&I
5	No insulation work is to be carried out on TG module and on its bearings during flushing & bearings pedestal area is to be maintained clean.	TMD
6	Check one cooler, whose oil side as well as water side are lined up, in service	Operation
7	MOT centrifuge is in service with purifier mode	TMD/Operation
8	One VEF in service	Operation
9	Provision of line filters in lub oil lines	TMD
10	Clean baskets strainers are put in MOT.	TMD
11	Availability of Lub oil pumps with P&I in service	Operation
12.	First DCEOP to be started for filling/venting of lines. Then DCEOP to be stopped &  AOP to be srated. Check AOP discharge pr., current & MOT level.	Operation

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13.	MOT level will start dropping. Monitor the same and take necessary precautions.	Operation
14.	See oil flow through each bearing return oil pipe.	Operation
15.	Inspect all pedestals for oil leakages ( both external and from internal fittings, hoses , gauges,etc).	Operation
16.	Check for any oil leakage in MOT room, oil canal & pedestal area.	Operation
17.	Monitor choking of duplex filter.	Operation/TMD
19.	MOT coolers are filled and venting done.	Operation
20.	Stop AOP and clean the Oil line filters and MOT basket strainer after first four hours of oil flushing.	Operation/TMD
21.	Clean duplex filter when choked more than 50%	TMD
22	Collection samples from MOT tank, Centrifuge inlet & outlet	Chemistry
23.	When frequency of cleaning   of duplex filter reduces considerably and simultaneously clearance is received from chemistry department of mechanical impurities and moisture (both < 100 ppm) , oil flushing is stopped .	Operation/TMD/chemistry
24.	Basket strainer is removed, cleaned and put back in position.	TMD
25.	Remove oil line filters and replace with oil throttles.	TMD

Completion Criteria:  

• · Mechanical Impurities & Moisture Content in samples are less than 100ppm by weight
  
• · MOT strainer should remain clean after 24 hours of TG Oil flushing
  
• · There should not be any hard particle in line filters
  
• · Duplex filters are required to be cleaned after 12 hours of oil flushing
  

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CHECK LIST FOR PUTTING TG ON BARRING

Sr. No	ITEM DESCRIPTION	Responsibility	Status
1	Clearance from C&I, TMD, chemistry before putting on Barring	Operation
2	Oil vapour extractor Normalised & ON	Operation
3	Generator bearing chamber exhauster ON.	Operation
4	Check for local line up of lube oil and jacking oil systems.	Operation
5	All pipe connections are OK.	Operation/TMD
6	Check lift of rotor journals at all bearing pedestals.	TMD
7	Check hand barring is free prior to putting oil barring.	Operation/TMD

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