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Therefore I have a question about allowable stress for this material. It is not listed in table K-1.XL83NL said:A519 4130 isnt listed in B31.3, so you have an unlisted material
As I have stated above, B31.3.XL83NL said:What design code is specified in the engineering spec?
OBM, WBM, BrineXL83NL said:What is the service youre using the piping for?
No, I use Chapter IX due to high pressure service.XL83NL said:You're referencing chapter IX. Has chapter IX been specified by your customer? Chapter IX is not that straightfoward as the base Code, and requires a more thorough analysis.
Right. For allowable stress as well.XL83NL said:The rules for using unlisted materials are different in chapter IX compared to the base code.
K302.3XL83NL said:What makes you come to 56667 psi?
DSGPDE said:No, I use Chapter IX due to high pressure service.
Read my 1st post again.K300 GENERAL STATEMENTS
(a) Applicability. This Chapter pertains to piping designated
by the owner as being in High Pressure Fluid Service.
Not it's not. First of all, there's no hard limit in B31.3 when ch. IX (or High Pressure Fluid Service, which is what its really called) kicks in. And certainly not at just any number like 6170 psi. Second, B16.5 doesnt specify PN-based ratings, it's 100% all the way Class-rated, but that a-side.According to 31.3 Chapter IX is applicable for High pressure systems (pressure in excess of B16.5 PN 420 (Class 2500)). Which is 6170 psi.
DSGPDE said:Why you use Chapter II in one case and Chapter IX in other?
So, 15000 psi is not a high pressure. I got it.XL83NL said:Not it's not. First of all, there's no hard limit in B31.3 when ch. IX (or High Pressure Fluid Service, which is what its really called) kicks in. And certainly not at just any number like 6170 psi. Second, B16.5 doesnt specify PN-based ratings, it's 100% all the way Class-rated, but that a-side.
It is not required on Basic Design stage. However if I have some spare time I plan to look into it.XL83NL said:- Have you considered fatigue analysis for example?
Not sure if you read my posts. Usually owner agree with our choice. I'm also not well familiar with Chapter IX therefor I ask my questions. I was wondered if I can utilize Section IX and decrease WT. Looks like you do not know.XL83NL said:- Do you have all information necessary to perform the analyses and tests required by ch IX (review K300(b)(1)), provided by the owner?
No. Our design was done according to Chapter II. And it is way too conservative.XL83NL said:- Are you experienced in ch IX design?
I came to forum to ask a question. What is an allowable stress for a pipe/which Chapter to use for WT calcs and I have provided all requested information like material, service, temperature, pressure. Looks like you also do not know the answer. What is you point? Trolling?XL83NL said:Something tells me your not really understanding the Code's intent, and should be looking for expert help on this subject