Maximum test pressure for pipe.
Maximum test pressure for pipe.
(OP)
Which is the formula to calculate the maximum pressure to which they may submit a carbon steel pipe?
that standard is?
Thanks for you help.
Good day.
hfpolo
that standard is?
Thanks for you help.
Good day.
hfpolo





RE: Maximum test pressure for pipe.
To 100% SMYS of the pipe. Use Barlows Formula P=2St/D.
The code governing your pipelines (in the country/area(s)) you are in may state a specific maximum test pressure, some codes do not, but typically you would not test past a hoop stress of 100% SMYS.
RE: Maximum test pressure for pipe.
David Simpson, PE
MuleShoe Engineering
"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.
The plural of anecdote is not "data"
RE: Maximum test pressure for pipe.
Ultra max is as brimmer wrote.
For B31.3 piping, the hydrostatic or pneumatic leak test would either restrict you to 100% resp. 90% SMYS.
RE: Maximum test pressure for pipe.
The limit is described as a maximum 2% strain.
Independent events are seldomly independent.
RE: Maximum test pressure for pipe.
So, if you were to follow ANSI / ASME B16.5 or B31.4/8 (here in Canada, CSA Z662 & Z245.11/12) limits for fittings/flange ratings, you'd probably be set.
RE: Maximum test pressure for pipe.
Independent events are seldomly independent.
RE: Maximum test pressure for pipe.
I'll concede to you on that one...the pipe sizes I deal with are more in the small range by comparison, I suspect.
If I ever found myself in a situation where the flange rating exceeded the pipe rating, I'd look to find either lower rated flanges or thicker wall pipe. To me, that would just feel odd.
RE: Maximum test pressure for pipe.
Independent events are seldomly independent.
RE: Maximum test pressure for pipe.
The fact you are asking this sort of very basic question troubles me. The answer to you question will vary widely depending on which code you are designing to - if you don't know ask you boss / client - where you are (plant, countryside, town), what your deign factor is (important for B31.8), what your design pressure is etc etc.
Given the complete lack of info on any of these items I am not willing to give you potentially critically incorrect information which you then use in a test of unknown size pipe which could easily seriously injure someone if it all goes wrong.
Always look at the weakest point (lowest point) and lowest rated pipe / equipment.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Maximum test pressure for pipe.
Last time we had this discussion I had the same opinion that SNORGY has, it just felt wrong to have an ANSI 300 system that wasn't rated to 600 psig. You convinced me that what you were saying was correct and I've taken off the "flange defines the system" blinders. It is a hard step for people never do big inch pipelines.
David Simpson, PE
MuleShoe Engineering
"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.
The plural of anecdote is not "data"
RE: Maximum test pressure for pipe.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Maximum test pressure for pipe.
Independent events are seldomly independent.
RE: Maximum test pressure for pipe.
Actually, BigInch, your post sent me away to bed with my iPad, trying to imagine what it would be like to have a 24" OD pipeline using 3/8" wall thickness and PN-100 flanges with an MOP of 9930 kPag. I came to the conclusion that you had a valid point.
RE: Maximum test pressure for pipe.
But "they" want to replace it with the same pipe and pipe wall thickness. Sometimes its hard to convince people that "more steel is good" .... even on a 8 foot length.
RE: Maximum test pressure for pipe.
Worse in the face of prior trouble.
Not learning from experience is a very serious mistake.
That's what destroys my faith in the self-policing theory.
The accountants, shareholders and engineers with bonus $$ in their eyes, that seem to make up 102% of the police force.
Independent events are seldomly independent.
RE: Maximum test pressure for pipe.
Independent events are seldomly independent.