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MAWP Calculation
Posted: 22 Nov 2010, 05:34
by octane
Please guide me for MAWP calculations of in-service process piping.
Re: MAWP Calculation
Posted: 24 Nov 2010, 11:48
by arcpro
I have attached the sample calculations for MAWP (ASME B31.3 - Process Piping)
Re: MAWP Calculation
Posted: 24 Nov 2010, 14:34
by octane
Thanks arcpro.
Re: MAWP Calculation
Posted: 25 Nov 2010, 06:08
by Nabeel Ahmed Qureshi
Can i use this formula for calculating MAWP of gas pipe line designed as per ASME B-31.8?
Regards
NAQ
Re: MAWP Calculation
Posted: 25 Nov 2010, 06:19
by Nabeel Ahmed Qureshi
Can i use this formula for calculating MAWP of gas pipe line designed as per ASME B-31.8?
Regards
NAQ
Re: MAWP Calculation
Posted: 25 Nov 2010, 08:49
by arcpro
Nabeel,
For that you have to include the factor F, temperature derating factor T and instead of allowable stress value S, use yield stress as suggested in Appendix D of B31.8. F depends on the location class and T is 1.0 if the temperature is 250 deg F or less.
The formula given for design pressure in ASME B31.8 is as follows:
P = 2St (F.E.T)/D
MAWP should be defined below this in any case.