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Moonby86
Associate

Join Date: Mar 2011
Posts: 36

MAWP (Max. Allowable Working Pressure)

06/27/2011 2:50 AM

Hi Gentlemen,

Please advise me of how I can determine the MAWP. Basically, to calculate all kinds of pressure retaining material according to the ASME code, we need to know the design pressure and temperature. But, MAWP also needs to compare with calculated MAWP as for all kinds of materials. However, in case the design data sheet does not show the MAWP, is it available for using design pressure as MAWP? Your detail help would be helpful for me to determine what MAWP is.

PS, Please note that this question is for only someone who can give me kind explanation and don't answer for someone who has just critical and negative mind and get me to take a caution.

Thank you all and good luck.
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pritam
Guru
Engineering Fields - Mechanical Engineering - New Member India - Member - New Member

Join Date: Aug 2008
Location: City of destiny, INDIA
Posts: 775
Good Answers: 67
#1

Re: MAWP(Max. Allowable Working Pressure)

06/27/2011 5:16 AM

ASME codes use the term 'design pressure' Some other standards or rules use MAWP, for example Indian Factory Rules. Hydro test pressure is 1.5 times of either design pressure or MAWP as per different standards. So, I believe design pressure can be used as MAWP.
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pdef
Power-User

Join Date: Apr 2011
Posts: 100
Good Answers: 5
#2
In reply to #1

Re: MAWP(Max. Allowable Working Pressure)

06/27/2011 11:53 AM

For ASME calculations, "design pressure" and "MAWP" are the same number. The terms are used interchangeably in pressure vessel work by various manufacturers and fabricators but they are the same numerical value.
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Codemaster
Guru

Join Date: Jul 2005
Location: Stoke-on-Trent, UK
Posts: 4496
Good Answers: 137
#3

Re: MAWP (Max. Allowable Working Pressure)

06/27/2011 12:00 PM

MAWP is the pressure the (weakest part of the) vessel will stand, using actual, commercially available material thickness, which is likely to be somewhat greater than calculated thickness. So MAWP is always at least equal to design pressure. Maybe some codes require the designer to calculate the MAWP, but some don't. In the latter case design pressure can be used as MAWP (in agreement with pritam)

Cheers.........Codey

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