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jana_subrata
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Tripping of Turbine and Driven Compressor

12/01/2015 1:34 PM

Model : HG32/20-3 + k 601-2 Type Horizontal split

Inlet pr (Min./ Normal/Max.) : 100/101/111 Kg/cm2 abs.

Inlet Temp. (Min./ Normal/Max.) : 480/480/510 Deg C

Extraction pr. (Min./ Normal/Max.) : 27/28/30Kg/cm2

Extraction Temp. ( Normal/Max.) : 336/350 Deg C

Extraction flow in T/Hr. (Min./ Normal/Max.) :20/37/42 T/Hr.

Speed (Normal/rated/): 9095/9510 RPM

This Turbine was retrofitted in 2012 with Electronic Governing System, Since then Turbine and compressor running continuously .

recently Turbine tripped 03 times :

1. indication was ESV open limit switch off. assuming the malfunction of Governor trip solenoid valve, the solenoid valve was replaced.

2. During 2nd tripping , turbine tripped and the indication was same..the indication was ESV Open limit switch off( the Trip Oil Pr. camedown from 9.0 kg/cm2 to 0.0 kg/cm2 in 10 sec) & speed came down from 8970 rpm to 0 in 60 sec.

3. During 3rdtripping - Turbine tripped on DCS, First out logic has logged trip due to Governor. Governor was having trip reason due to loss of speed.

In sequence of Event(SOE) of PLC, first event was ESV Limit switch close & then trip oil pr. coming less than 4.5 kg/cm2 & then 2.0 kg/cm2 & then gov. trip signal.

Request to go through the above problem and suggest remedial actions please.
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lyn
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#1

Re: Tripping of Turbine and Driven Compressor

12/01/2015 2:19 PM

Contact the turbine manufacturer and ask for field services to come and help you.

They will fix it for their standard fee. It will not be free, but the work will be guaranteed.

The forum can't see what the causes are from here.

As I said earlier, our crystal ball is broken and Carnac the Magnificent is dead.
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redfred
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#2

Re: Tripping of Turbine and Driven Compressor

12/01/2015 2:34 PM

I see what the problem is.

Don't you.

Look, I'm pointing right at it.

Come on. This should be obvious, by now.

This is a classic PEBKAC scenario.

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RAMConsult
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#3

Re: Tripping of Turbine and Driven Compressor

12/01/2015 6:03 PM

You've had three trips, and each case the Emergency Stop Valve (ESV) Limit Switch is mentioned. So what do you do? Continually ignore the fact that the limit switch may be faulty or in need of adjustment.

The remedial action is obvious, management should terminate the employment of everyone who stands there scratching their a$$ head while ignoring the obvious. The saved wages should go to paying professionals to do your job.

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James Stewart
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#6
In reply to #3

Re: Tripping of Turbine and Driven Compressor

12/03/2015 8:44 AM

What is troubling to me, the apparent lack of a back-up turbine oil pump. When I see turbine oil pressure drop to zero almost instantaneously, and spin-down takes at least 60 seconds, rest assured, the last twenty seconds at least are more of a grinding to a halt, than a true spin-down.

This could explain why the machine tripped the second, third, and every other time from now on, until a major overhaul of the bearings. I think they wiped the bearings on the first trip, since they apparently (1) do not know what they are doing, and (2) failed to keep oil active on the bearings.

If the ESV is linked to vibration rms value, then perhaps there were problems even before this with loss of oil on bearings surfaces during a trip. These events seem to be linked to turbine vibration issues, with the third trip being related to not being able to even keep turbine speed up - the bearings are probably getting really toasty by now.

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SHOCKHISCAN
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#4

Re: Tripping of Turbine and Driven Compressor

12/02/2015 2:44 PM

Look for:

1) Loose and/or faulty turbine feedback and DCS control circuit wiring.

2) Worn out or broken limit switches.

3) Grounded or shorted control circuit wiring.

4) Bad relays and relay contacts.

Remember that all DCS alarms will be initiated during a turbine trip.

If you do not have "First Out" alarm sequencing enabled or not available it will be very difficult to identify which component is responsible for the trip.

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TonyS
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#5

Re: Tripping of Turbine and Driven Compressor

12/02/2015 5:20 PM

Either homework questions are getting more complex nowadays or you have got a placement and been given a problem to resolve?

If neither of the above, ask the plant engineer for help.

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James Stewart
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#7

Re: Tripping of Turbine and Driven Compressor

12/03/2015 8:48 AM

You failed to keep oil on the bearings, and now they are wiped (galled). You will have to undertake a complete turbine overhaul at this point. Stop messing around and contact the manufacturer and schedule a work-over crew into your facility.

You should have installed a back-up oil pump on a UPS (uninterruptible power supply). Maybe you should acquire one of these before the overhaul is completed.

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redfred
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#8
In reply to #7

Re: Tripping of Turbine and Driven Compressor

12/03/2015 10:05 AM

They might also need an ESO interlock system, too. This will help to prevent PEBKAC interrupts.

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James Stewart
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#9
In reply to #8

Re: Tripping of Turbine and Driven Compressor

12/03/2015 10:22 AM

But if you put the ESO interlock in service, does that really prevent unwarranted operator intervention? Kind of eliminates job security in that location, does it not?

All these acronyms are causing PEBKAC lock on my end.

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jana_subrata
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#10

Re: Tripping of Turbine and Driven Compressor

12/03/2015 11:39 AM

Very glad to see your msg.. with the above sequence of events we are of the opinion that the OSG Tester may causing this doubtful false tripping..now its running steadily..contacted to manufacturer for the exact cause of tripping.
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TonyS
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#11
In reply to #10

Re: Tripping of Turbine and Driven Compressor

12/03/2015 5:48 PM

It's too late now!

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James Stewart
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#12
In reply to #10

Re: Tripping of Turbine and Driven Compressor

12/04/2015 11:26 AM

I still think you are operating a damaged machine, due to loss of oil pressure you noted.

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jana_subrata
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#13
In reply to #12

Re: Tripping of Turbine and Driven Compressor

12/04/2015 11:39 AM

no Mr. James Stewart now running ormal at RPM: 8970; control oil pr. : 8.97 kgcm2, Trip oil pr.: 8.96, S.O.P( L.P): 3.1; S.O.P (H.P): 4.0 ad Start up oil pr. ESV: 0.0.. Vibration readings are within limit..

Regards
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James Stewart
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#15
In reply to #13

Re: Tripping of Turbine and Driven Compressor

12/04/2015 12:07 PM

Cheers! May she run well from now on! Good luck.

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jana_subrata
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#14

Re: Tripping of Turbine and Driven Compressor

12/04/2015 11:52 AM

yes we've plugged the tester oil outlet port of the OSG Tester & the tester oil inlet to the Turbine Shaft in the bearing housing cover..it's running satisfactorily.
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Users who posted comments:

James Stewart (5); jana_subrata (3); lyn (1); RAMConsult (1); redfred (2); SHOCKHISCAN (1); TonyS (2)

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