Seal Oil Initial

8/12/2019 Seal Oil Initial

1/23

Station: NTPC Simhadri BHEL Ref No. PS-DC-186-5-6!NTPC Ref No. S"#$1$TS$%$5 !

Sheet 1 of %

P&ant area : T'RB"NE

PR(CED'RE )(R *ENER!T(R SE!L ("L "NT"!L C"RC'L!T"(N

S&. No.

1.

%.

+.

,.

5.

6.

.

8.

.

1.

PL!NT DET!"LS

(B/ECT"0E

PR(P(S!LS

SER0"CES RE'"RED

S!)ET2 PREC!'T"(NS

E#ER*ENC2 PR(CED'RE

ST!TE () THE PL!NT

#ETH(D

C(#PLET"(N CR"TER"!

!PPEND"CES

a3 Dra4in

3 Lo Sheet7


2/23

Station: NTPC - Simhadri BHEL Ref No. PS-DC-186-5-6

NTPC Ref No. S"#$1$TS$%$5Sheet % of %



S&. No.

1.

1.1

1.%

1.+

1.,

1.5

PL!NT DET!"LS

Generators cooled by H2 are provided with sealoil system for preventing the leakage of H2toatmosphere for the formation of explosivemixture and to reduce the consumption of H2.

This system consists of tank, pumps, (oth!.".and #."$ coolers, filters and pressureregulators to maintain the oil pressure at the sealbody of generator. Turbine oil is used for thispurpose.

#" pump is meant to supply oil to the sealsduring the failure of !" power supply during

emergency conditions.

%or Technical &pecifications, the respective ' )manuals are to be referred.

The drawings enclosed at section *+.+ are

a$ &chematic for oil flushing of &eal 'il iping. #rg.-o. /&/T&0/++1/++

b$ "ontrol 3alue rack of &eal 'il &ystem.

#rg.-o./&/T&0/++1/++

ST!T'S

Sinatre7

NTPC BHEL


3/23


4/23

Station: NTPC Simhadri BHEL Ref No. PS-DC-186-5-6

NTPC Ref No. S"#$1$TS$%$5Sheet , of %



S&. No.

+. PR(P(S!L "ommissioning of seal oil system is carried out inthe following stages/

*$ %illing and operation of air side seal oilcircuit.

2$ %illing and operation of H2 side seal oilcircuit

$ &etting of seal oil pressures.$ "hecking of functioning of pressure

switches and level detectors.4$ )easurement of seal oil flow.

ST!T'S

Sinatre7

NTPC BHEL


5/23


NTPC Ref No. S"#$1$TS$%$5Sheet 5 of %



S&. No.

,.

,.1

,.%

,.+

,.,

,.5

SER0"CES RE'"RED

5estoration of oil piping and normali6ation after oil flushing.

%illing of seal oil storage tank with fresh oil and running of!vailability of service air and thinner7petrol for filtercleaning.

!vailability of sufficient skilled manpower for supervision 7execution of the process.

!vailability of portable fire extinguishen at oil flushing area.

!vailability of proper lighting and communication facility.

ST!T'S

Sinatre7

NTPC BHEL

Station: NTPC Simhadri BHEL Ref No. PS-DC-186-5-6 Sheet 6 of %


6/23


7/23

NTPC Ref No. S"#$1$TS$%$5



S&. No.

6.

6.1

6.%

6.+

6.,

6.5

E#ER*ENC2 PR(CED'RES:

The teams for this operation shall be aware ofthe procedure of oil flushing and act at the timeof any emergency.

They shall be aware of operation of fireextinguishers.

They shall be aware of how to act in case of anypersonal in>uries.

They shall know to stop the pumps 8uickly incase of any leakage and then inform theconcerned higher official.

They shall be aware of re;establishing theoperation in case of system stoppage due tofailure of power supply.

ST!T'S

Sinatre7

NTPC BHEL


8/23




9/23



S&. No.

.

.1

.1.1

.1.%

.1.+

.1.,

.1.5

.1.6

ST!TE () THE PL!NT

5estoration of oil piping and normali6ation after oilflushing.

3erification of logic and control scheme of seal oilpumps as per control diagram.%illing of seal oil storage tank with fresh oil andrunning of !vailability of service air and thinner7petrolfor filter cleaning.!vailability of sufficient skilled manpower forsupervision 7 execution of the process.

9nsure the cleanliness of both filters provided in airside and H2 side seal oil circuit.

9nsure that all the shut off and gate valves areclosed.


10/23


NTPC Ref No. S"#$1$TS$%$5Sheet of %


PR(CED'RE )(R H2DR!'L"C TEST !ND ("L )L'SH"N* () *ENER!T(R

SE!L ("L S2STE#

S&. No.

.1.6

.1.

.1.8

hysical cleaning of seal oil storage tank andseal oil tank after flushing.

!vailability of power and control supply for

motors and starting panels.

Trial run of following motors and coupled withrespective pumps.

a. !ir side seal oil pump motor (!"$ 2 nos.

b. 9mergency air side sealoil pump motor (#"$ * no.

c. H2 side seal oil pump motor (!"$ * no.

ST!T'S

Sinatre7

NTPC BHEL

Station: NTPC - Simhadri BHEL Ref No. PS-DC-186-5-6 Sheet 1 of %


11/23



PR(CED'RE )(R H2DR!'L"C TEST !ND ("L )L'SH"N* () *ENER!T(RSE!L ("L S2STE#

S&. No. ST!T'S

Sinatre7

NTPC BHEL

Station: NTPC - Simhadri BHEL Ref No. PS-DC-186-5-6 Sheet 11 of %


12/23



S&. No.

8.

8.1

#ETH(D

)"LL"N* !ND (PER!T"(N () !"R S"DE SE!L("L C"RC'"T:

ST!T'S

Sinatre7

NTPC BHEL

Station: NTPC Simhadri BHEL Ref No. PS-DC-186-5-6NTPC Ref No. S"#$1$TS$%$5

Sheet 1% of %


13/23



S&. No.

8.1

8.1.1

)"LL"N* () !"R S"DE SE!L ("L C"RC'"T

'pen following shut off and gate valves in airside oil circuit.

)?: +* !! 4+ !t seal oil storage tank

)?: ** !! 4+* before seal oil pump (*$.

)?: 2* !! 4+* before seal oil pump (2$

)?: * !! 4+* before stand by sealoil pump ($

)?: 2* !! ++* after seal oil pump (*$

)?: 2* !! ++2 after seal oil pump (2$

)?: * !! ++ after stand by sealoil pump (*$

)?: ** !! 4+ before !* valve

)?: ** !! 4+4 after !* valve

)?: * !! 4+ before !2 valve)?: * !! 4+4 after !2 valve

)?: ** !! ++ after seal oil pumps (*$ (2$

)?: * !! ++ after stand by seal oil pumps($

)?: + !! 4+2 before float valve, oil inlet

)?: + !! 4+* after float valve, oil drains ($

)?: + !! 4+4@ for oil level gauge

)?: + !! 4+1@

)?: A* 4+* ad>ustable orifice

)?: A1 !! 4*@ seal ring relief oil

)?: A1 !! 42@

ST!T'S

Sinatre7

NTPC BHEL


14/23


NTPC Ref No. S"#$1$TS$%$5Sheet 1+ of %



SE!L ("L S2STE#

S&. No.

8.1.%

8.1.+

8.1.,

8.1.5

"harge the seal oil coolers on oil side with rotarytransfer valve assembly in centre position. :henthe coolers are filled with seal oil, turn rotarytransfer valve on one side i.e. 5ight hand or lefthand side to bring one cooler in service andother on standby.

"harge both seal oil filters as done in case ofcoolers and keep one seal oil filter in service bykeeping rotary transfer valve on one side.

&tart and stop seal oil pump * for a short time tobleed air from piping until pressure gauges )?:A* " 4** and " 42* indicate a constantpressure.

&et three way valves )?: A* !! 4** and !!42* and )?: A1 !! 4** and !! 42* to positionwhere no oil passes through the volume flowindicator.

ST!T'S

Sinatre7

NTPC BHEL


15/23


NTPC Ref No. S"#$1$TS$%$5Sheet 1, of %



S&. No.

8.%

8.%.1

8.%.%

)"LL"N* () H%S"DE SE!L ("L C"RC'"T

#uring filling of the air side circuit, the seal oil

tank is simultaneously filled with seal oil by valve)?:+ !! 4+2. 'il level in this tank willcontinue to rise above the sight glass till itreaches the level of seal oil storage tank and willget drained through siphon action.

'pen following shut off and gate valves of H2side seal oil circuit.

)?:* !! 4+* before H2side seal oil pump

)?:* !! ++ before H2side seal oil pump

)?:* !! 4*+ before B"C valve

)?:* !! 4+

ST!T'S

Sinatre7


16/23

NTPC BHEL





S&. No.

8.%.+

8.%.,

8.%.5

8.%.6

8.%.

"harge both seal oil coolers on oil side withrotary transfer valve assembly in its centerposition. :hen both cooler are filled with sealoil, turn rotary transfer valve on one side i.e.5ight or


17/23

Sinatre7

NTPC BHEL





S&. No.

8.,.

8.,.1

("L )L'SH"N* () S2STE#

'il flushing of seal oil circuit is carried out inthree different stages.

i. %lushing of air side circuitii. %lushing of H2side circuitiii. %lushing of oil impulse lines

%lushing of !ir &ide &eal 'il "ircuit. %lushing ofair side seal oil circuit is carried out by one of the!" seal oil pumps provided in the system.#uring this process, oil flow is maintained

through seal oil cooler, filter, valve !*, !2, inletseal oil pipes/ bearing drain pipes to seal oilstorage tank. arallel to this, inlet ring relief oilpipes are also flushed in this circuit.

ST!T'S


18/23

Sinatre7

NTPC BHEL





S&. No.

8.,.%

8.,.+

8.,.,

8.,.5

%lushing of H2 side &eal 'il "ircuit. %lushing of

this circuit is carried out by H2 side seal oil pumpprovided in the system. #uring this process, oilflow is maintained through H2 side seal oil cooler,filter, valve B"C, Dnlet H2 side seal oil pipes, H2side drain pipes, prechambers, seal oil tank.

%lushing of 'il Dmpulse


19/23

8.,.6

8.,.

Give thermal stocks as done in Turbine lub oilsystem flushing. (5efer rocedure &;#"E*F1;4++;+++7-T" 5ef -o. &D)7*7T&727++*$

"hangeover the filter after every one hour andclear. "leaning of filter to be carried out byfollowing steps.

a$ "lean the filter element in ?erosene 7#iesel 'il.

b$ Then clean the filter element with cleanmarkin cloth.

Sinatre7

NTPC BHEL





S&. No.

8.,.8

8.,.

8.5.

8.5.1

8.5.%

c$ "lean and dry the filter with compressed air.(!ir pressure to be reduced sufficiently for airblowing filter$

Take sample of return oil and analyses if for thepresence of moisture mechanical impurities.

Hydraulic test of the lines (excluding seal oilrack$ shall be carried out at a pressure of *2kg7cm2 along with lub;oil system.

5estoration of &eal 'il &ystem

(n 9om&etion of oi& f&7hin:

#rain the entire system.

5emove the temporary piping and restoreoriginal connections.

ST!T'S


20/23

8.5.+

8.5.,

8.5.5

8.5.6

5emove the blanks provided, if any.

"onnect back the impulse lines.

5eassemble the float valves )?:' !! ++*and !! ++2 in seal oil tank.

"lean both the filters and reassemble.

Sinatre7

NTPC BHEL





SE!L ("L S2STE#

S&. No.

. C(#PLET"(N CR"TER"!

The charging of seal oil system is said to becompleted once the oil flow is establishedthrough both sides of the generator seals and

the pressure regulators are put in to service.

ST!T'S


21/23

Sinatre7

NTPC BHEL

Sheet 20 of 20

SEAL OIL PUMP NO. 1 / 2

Sl.No Date/Time Pump Dis.Pr.

Oil temperatureThermal

Sho!"emar!s#ef.

$ooler

After

$ooler


22/23

Sinatre7

NTPC BHEL


23/23

P"O$EDU"E %O" &'D"AULI$ TEST AND OIL

%LUS&IN( O% (ENE"ATO" SEAL OIL S'STEM

Documents

Seal Oil Initial