Previous in Forum: Machine Drive Chain   Next in Forum: Lube Oil Pipe Material in ST Should Go By SUS or Can Go By Carbon Steel?
Close

Comments Format:






Change Mode
Close

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Close

Rating Vote:







Add Vote
8 comments
Rate Comments: Nested
alokd
Active Contributor

Join Date: Nov 2011
Posts: 12

Pressure Rating for a Custom Forged TEE

03/29/2012 5:55 PM

I need to model a 2" forged custom TEE made out of 4130 Steel (heat treated to 100000 psi yield) to be used as a pressure relief valve body at 12000 psi.

What code/formula do I use to get the minimum required thickness of the TEE to withstand that pressure?

Thanks!

Alok
Register to Reply
Interested in this topic? By joining CR4 you can "subscribe" to
this discussion and receive notification when new comments are added.
lyn
Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#1

Re: Pressure rating for a custom forged TEE

03/29/2012 7:51 PM

What's the specification say?
Register to Reply
cingold
Guru

Join Date: Nov 2007
Posts: 519
Good Answers: 11
#2

Re: Pressure Rating for a Custom Forged TEE

03/30/2012 10:57 AM

Well I'm not sure which code you want to use but in the case of ASME B31.3, you can either make it and test it exactly like they suggest in their various codes OR...

302.2.3 Unlisted Components

(a)

Components not listed in Table 326.1, but which

conform to a published specification or standard, may

be used within the following limitations.

(1)

The designer shall be satisfied that composition,

mechanical properties, method of manufacture, and

quality control are comparable to the corresponding

characteristics of listed components.

(2)

Pressure design shall be verified in accordance

with para. 304.

(b)

Other unlisted components shall be qualified for

pressure design as required by para. 304.7.2.

I would check out Para. 304.7.2 in the code. My understanding of what you're doing is that you are custom building a fitting that may not match anything listed. You have options on how to verify it but it sounds like you might need an FEA analysis.

Also, I would read the scope of ASME B31.3. It's a common standard but what you're doing may or may not be covered under this standard.

Out of curiosity, why do you need a custom built Tee?
Register to Reply
alokd
Active Contributor

Join Date: Nov 2011
Posts: 12
#3
In reply to #2

Re: Pressure Rating for a Custom Forged TEE

03/30/2012 4:35 PM

Thanks for your response Cingold.

I need the TEE to be rated for 12000 psi, which will be a lot thicker than any of the standard 2" TEEs. Also, my face to face dimensional requirements are different than a regular 2" TEE. Because of such a high pressure rating requirement, I am looking to make it out of 4130 forging, heat treated to 100000 psi yield strength.

Thanks!

Alok
Register to Reply
Jacob Klepatch
Commentator

Join Date: Aug 2011
Posts: 96
Good Answers: 1
#6
In reply to #3

Re: Pressure Rating for a Custom Forged TEE

04/01/2012 2:00 AM

If the problem is yp VERSUS REQUIRED Thickness

Why not to use:43400 or European nearest Equivalent;34NiCrMo6 ?!?

(YP=1320-1080 MPa,compared to your 100 KSI-equivalent to 681 MPa)
Register to Reply
cingold
Guru

Join Date: Nov 2007
Posts: 519
Good Answers: 11
#8
In reply to #3

Re: Pressure Rating for a Custom Forged TEE

04/02/2012 8:58 AM

Without knowing all the details of your project, I think you would need FEA for this, especially at this pressure. Check out the high pressure section of B31.3 as well (some details on it are listed below).
Register to Reply
Abdel Halim Galala
Guru
Engineering Fields - Piping Design Engineering - New Member Egypt - Member - Member since 02/18/2007

Join Date: Feb 2007
Location: Cairo, Egypt
Posts: 1733
Good Answers: 248
#4

Re: Pressure Rating for a Custom Forged TEE

03/31/2012 2:35 AM

● See ASME BPVC, Section VIII-3, Para. KG-100 Scope.

KG-101 Intent. The rules of this Division constitute requirements for the design, construction, inspection, and overpressure protection of metallic pressure vessels with design pressures generally above 10 ksi (70 MPa). However, it is not the intent of this Division to establish maximum pressure limits for either Section VIII, Division 1 or 2, nor minimum pressure limits for this Division. Specific pressure limitations for vessels constructed to the rules of this Division may be imposed elsewhere in this Division for various types of fabrication.

● See ASME B31.3, Chapter IX "High Pressure Piping", Para. K300 General Statements.

(a) Applicability. This Chapter pertains to piping designated by the owner as being in High Pressure Fluid Service. Its requirements are to be applied in full to piping so designated. High pressure is considered herein to be pressure in excess of that allowed by the ASME B16.5 Class 2500 rating for the specified design temperature and material group. However, there are no specified pressure limitations for the application of these rules.

__________________
 It is better to be defeated on principles, than to win on lies!
Register to Reply Off Topic (Score 4)
lyn
Guru

Join Date: Oct 2008
Posts: 42355
Good Answers: 1693
#5
In reply to #4

Re: Pressure Rating for a Custom Forged TEE

03/31/2012 8:46 AM

It seems that the automatic OT marker software has run amok.

I don't know how this answer is OT.
Register to Reply Off Topic (Score 5)
Mukesh0861
Power-User

Join Date: Dec 2010
Posts: 377
Good Answers: 20
#7

Re: Pressure Rating for a Custom Forged TEE

04/01/2012 7:49 AM

Why not you consult some safety valve manufacturer to guide you?
Register to Reply
Register to Reply
Have a Different Question?
8 comments
Copy to Clipboard

Users who posted comments:

Abdel Halim Galala (1); alokd (1); cingold (2); Jacob Klepatch (1); lyn (2); Mukesh0861 (1)

Previous in Forum: Machine Drive Chain   Next in Forum: Lube Oil Pipe Material in ST Should Go By SUS or Can Go By Carbon Steel?

Advertisement

Got Something to Say?
Ask a Question
Start a Discussion

Search this Forum
Mechanical Engineering:
Go

CR4 Sections
Aerospace
BioMech & BioMed
Chemical & Material Science
Civil Engineering
Communications & Electronics
Education and Engineering Careers
Electrical Engineering
General Discussion
Instrumentation
Manufacturing
Mechanical Engineering
New Technologies & Research
Software & Programming
Sustainable Engineering
Transportation

Site Directories
Forum Directory
Blog Directory
User Group Directory
RSS Feeds

CR4 Rules of Conduct
CR4 FAQ
Site Glossary

Who's Online (63 right now)
Show Members
Advertisement