Pressure ratings
Pressure ratings
(OP)
Anyone have a formula or know of another way to get the pressure rating of std steel pipe? I have to find out the rating on a piece of 3/4" XXH blk pipe.
Thanks!
Thanks!
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RE: Pressure ratings
For example,
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However, if you are designing a system, you would usually know the pressure and temperature of the system and consult with a reference book to select the most appropriate type of pipe for the job.
RE: Pressure ratings
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RE: Pressure ratings
RE: Pressure ratings
Only the flange pressure ratings are based on flange pressure ratings. The pipe could be designed for any other pressure rating one choses. There are many systems that have no need to be designed to a specific flange rating pressure. There are many pipelines designed for maximum allowed operating pressures of 500 psig, 800 psig, 1000 psig, 1200 psig etc.
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RE: Pressure ratings
Flange pressure ratings are based on flange pressure ratings.
Yes, it is also common to have a pipe rated to the same pressure as the flange.
This is one of those intra-discipline arguements where both sides understand what the others is saying, and for the most part are in agreement, just not the exact wording.
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RE: Pressure ratings
My maximum allowed operating pressure limits are decided by economics rather than B31.5 values.
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RE: Pressure ratings
And why would any designer unnecessarily let economics drive the cost of the end product?
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
RE: Pressure ratings
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RE: Pressure ratings
RE: Pressure ratings
I was answering the question immediately above my answer.
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RE: Pressure ratings
Within the B31.3 work, process engineers may assign the piping specification from the available contractor or client selection list. The basis is the fluid composition, pressure, temperature, etc. The selected piping specification identifies the pipe schedule for each size line as well as some valve specification code, etc. This normally works well with little real engineering; - a sort of 80:20 thing.
Eveything looks the same on a P&ID. Some of the senseless details are only noticed in the field with the "full-scale" model. When the piping size was reduced from 16 NPS to 12 NPS near a block valve it is noticed if the valve is 16 NPS instead of 12. The CEO rarely hears about such details. However, we should pay attention to all of these details during design.
Oh, yes the piping wall thickness may be tapered on cross country pipelines.
RE: Pressure ratings
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RE: Pressure ratings
I would of expected something like 48 inch or 60 inch pipeline for such a distance, you know, the Alyaska big bore stuff. But your response certainly explains why the XXH wall is needed on the 3/4 inch pipeline, 1467 miles long. What kind of compressor would you specify to get a viscous working medium, like crude oil, over the peaks of the Rocky Mountains? What kind of cost to build such a pipeline and where what kind of financial returns could be expected in the present market place? Must have just a huge end user, aye?
Kenneth J Hueston, PEng
Principal
Sturni-Hueston Engineering Inc
Edmonton, Alberta Canada
RE: Pressure ratings
Look, what's the problem? This thread went off topic a long time ago. If you don't like off-topics, you can ignore them.
Did you not ask?
I think those questions were answered, and without mentioning any specific wall thickness or diameter for that matter.
Do you have another question?
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