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#34506 - 04/22/10 01:08 AM Steam Turbine Piping Connections Failed
Osama_Nusrat Offline
Member

Registered: 04/22/10
Posts: 3
Loc: Pakistan
Dear Sir,

We have already procured a steam turbine and its existing piping is being checked by piping specialist using CAESAR II. The loads on suction nozzle connection and combined resultants (i.e. Limit 3) are not passed as per code NEMA SM 23.

I just want to get some sort of help or any engineering opinion to get the piping loadings and its impact reduced on suction nozzles according to the standard.

One idea is to make all support’s friction factor reduced by using Teflon or any other material that reduces the friction factor between the pipe and structure, because adapting above technique the turbine nozzle loadings as per NEMA SM 23 is within the limits.

I also want to confirm above engineering technique is viable in steam turbine piping or not recommended?

Appreciate your relevant help in above context.

Best regards,
Ali

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#34878 - 05/11/10 03:03 AM Re: Steam Turbine Piping Connections Failed [Re: Osama_Nusrat]
Osama_Nusrat Offline
Member

Registered: 04/22/10
Posts: 3
Loc: Pakistan
Waiting for the reply.


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#34880 - 05/11/10 03:55 AM Re: Steam Turbine Piping Connections Failed [Re: Osama_Nusrat]
AVenugopal Offline
Member

Registered: 03/28/10
Posts: 18
Loc: India
Dear friend,
It looks to me that may be if you could furnish some more information like the steam line isometric with support locations and design conditions together with turbine allowables, or the C2a file it will be possible for some one to look at what best may remidy the need. I feel that given data in your question doesnot give scope for some one to think not to offer an analytical advise.

Best regards

Venugopal

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#34913 - 05/12/10 07:53 AM Re: Steam Turbine Piping Connections Failed [Re: AVenugopal]
Venkades Offline
Member

Registered: 06/12/05
Posts: 7
Loc: India
Hi Ali,

You can also introduce one loop for adding more flexibility. or you can introduce spring hanger.

Otherwise, please send me you CAESAR file; I can suggest the solution from my end.

Regards
Venkadesh
_________________________
Thanks & Regards

N. Venkadeswaraperumal

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#34915 - 05/12/10 11:33 AM Re: Steam Turbine Piping Connections Failed [Re: Venkades]
Venkades Offline
Member

Registered: 06/12/05
Posts: 7
Loc: India
Sorry, I forgot to mention my email id. Please send me CAESAR file to my gmail id: nvenkades@gmail.com

Thanks
Venkadesh
_________________________
Thanks & Regards

N. Venkadeswaraperumal

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#34916 - 05/12/10 11:34 AM Re: Steam Turbine Piping Connections Failed [Re: Venkades]
Venkades Offline
Member

Registered: 06/12/05
Posts: 7
Loc: India
Sorry, I forgot to mention my email id. Please send me CAESAR file to my gmail id: nvenkades@gmail.com

Thanks
Venkadesh
_________________________
Thanks & Regards

N. Venkadeswaraperumal

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#35371 - 05/14/10 12:14 AM Re: Steam Turbine Piping Connections Failed [Re: Osama_Nusrat]
Osama_Nusrat Offline
Member

Registered: 04/22/10
Posts: 3
Loc: Pakistan
Dear All

I tried attaching my isometrics but couldnt find a tool on this page.

I was simply interested in knowing that teflon pads are recommended on inlet high temperature lines of steam turbines or not ?

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#35405 - 05/15/10 06:41 AM Re: Steam Turbine Piping Connections Failed [Re: Osama_Nusrat]
AVenugopal Offline
Member

Registered: 03/28/10
Posts: 18
Loc: India
You can, The shoe or what ever is coming in contact with hot steam line will have a machined base to which teflon will be attached. On the Carbon steel supporting beam also you will have another teflon pad. The thermal movement friction can be reduced that way without taking teflon to contact high temperature steam line surface. You may Google for PTFE pads, or look in to piping -world.com website or sek your vendors help.

Hope it helps you.

Bye and regards

Venugopal


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#38056 - 09/23/10 05:09 PM Re: Steam Turbine Piping Connections Failed [Re: Osama_Nusrat]
waskito_ardi Offline
Member

Registered: 09/22/10
Posts: 3
Loc: Jakarta, Indonesia
Originally Posted By: Osama_Nusrat
Dear Sir,

We have already procured a steam turbine and its existing piping is being checked by piping specialist using CAESAR II. The loads on suction nozzle connection and combined resultants (i.e. Limit 3) are not passed as per code NEMA SM 23.

I just want to get some sort of help or any engineering opinion to get the piping loadings and its impact reduced on suction nozzles according to the standard.

One idea is to make all support’s friction factor reduced by using Teflon or any other material that reduces the friction factor between the pipe and structure, because adapting above technique the turbine nozzle loadings as per NEMA SM 23 is within the limits.

I also want to confirm above engineering technique is viable in steam turbine piping or not recommended?

Appreciate your relevant help in above context.

Best regards,
Ali


Hi, Ali, I confront same problems that you have right now.

1.First step you must get clear statement from Steam Turbine vendor about exact location of "resolution point". The resolution point become one of important factor for NEMA analysis

2. Try to reduce the Force and moment by adding flexibility in your pipe routing. May be adding elbow.

3. Try to reduce Force and moment by adding Spring Support. Spring support can minimize significantly enough..

4. Adding stopper or guide

well I hope this tips can help you enough..

cheers,

Waskito blush

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#38222 - 10/05/10 11:32 PM Re: Steam Turbine Piping Connections Failed [Re: waskito_ardi]
Engr_mech Offline
Member

Registered: 06/01/10
Posts: 64
Loc: Australia
Hi,

What is the definition of "Resolution Point"?

Regards

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#38262 - 10/07/10 05:34 AM Re: Steam Turbine Piping Connections Failed [Re: Engr_mech]
NiTiN Stress Offline
Member

Registered: 10/22/09
Posts: 39
Loc: india
it is intersection of turbine shaft & its exhaust nozzle
Regards
Nitin Lonkar

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