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Associate

Join Date: Jun 2011
Posts: 32

Power Piping

07/04/2011 6:14 AM

Hello,

Regarding High Pressure Steam Piping to Steam Turbine,

*Condition: Design Temp. 549 deg.C, Pipe Material A335 P91

[Q1]

What is Max. Allowable Stress Value(SE)?

[Q2]

What is the difference between Max. Allowable Stress Values (SE) and Basic Allowable Stress 'S' indicated in ASME B31.3 Table A? Can I use 'S' instead of 'SE'?

Thanks

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Pathfinder Tags: ASME B31.3 Power Piping
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Guru

Join Date: Jan 2010
Location: Mineral wells Tx
Posts: 630
Good Answers: 34
#1

Re: Power Piping

07/05/2011 5:35 AM

May be for Power piping, ASME B31.1 is better. (Chapter II part 1 and part 2)

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Associate

Join Date: Jan 2010
Posts: 52
Good Answers: 2
#2

Re: Power Piping

07/06/2011 2:58 AM

1.

Max allowable stress is basically a yield point of material but at a SPECIFIC TEMPERATURE, in your case it is 549 deg.C. since yield point is taken at room temp and at different temperatures "SE" valve is used which will be less than its yield point.

2.

Max allowable stress and Basic allowable stress are almost same. ASME b31.1 uses Max allowable stress for "SE" and ASME B31.3 uses Basic allowable stress for "SE". if you compare both for a specific material at a specific temp, they will almost be same.

In your case you should refer ASME B31.1 for power piping

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