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gapee
Active Contributor

Join Date: Jan 2010
Posts: 14

Difference thickness

01/10/2010 2:29 PM

Hi,is it possible to Fit up and weld two difference thickness fitting with the same od?So is it acceptable on NDT TEST?
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Tornado
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Technical Fields - Technical Writing - New Member Engineering Fields - Piping Design Engineering - New Member

Join Date: May 2009
Location: Richland, WA, USA
Posts: 21017
Good Answers: 795
#1

Re: Difference thickness

01/10/2010 3:56 PM

If memory serves, misalignment of 1/16 inch is acceptable. However, an abrupt change of thickness constitutes a stress riser, which might not be allowed in high-pressure or critical piping. In that case, the thicker I.D. could be tapered (3:1 length/depth ratio) so that the joint matches. Check the governing codes.

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PennPiper
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Engineering Fields - Piping Design Engineering - Retired Piper

Join Date: Feb 2007
Location: Bayonet Point, Florida
Posts: 635
Good Answers: 61
#2

Re: Difference thickness

01/10/2010 4:32 PM

Look at this link, it says reducer but it is the answer to your question.

http://cr4.globalspec.com/thread/45236/Reducer-Thickness

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Lahane82
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Join Date: Oct 2008
Location: Gurgaon,India
Posts: 48
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#3
In reply to #2

Re: Difference thickness

01/10/2010 5:12 PM

see-http://cr4.globalspec.com/thread/27584/piping
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Abdel Halim Galala
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Engineering Fields - Piping Design Engineering - New Member Egypt - Member - Member since 02/18/2007

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

Re: Difference thickness

01/11/2010 6:29 AM

• See CR4 Thread: Pipe Thickness and Branch Connections.

• Download the acceptable pipe branch connection: Acceptable_Pipe_Branch_Connection.

• For calculating the thickness of pipe whatever it is a header or subheader (run or branch), see the following CR4 Thread: Designing High-Pressure Pipes.

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Abdel Halim Galala
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Engineering Fields - Piping Design Engineering - New Member Egypt - Member - Member since 02/18/2007

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Location: Cairo, Egypt
Posts: 1733
Good Answers: 248
#5
In reply to #4

Re: Difference thickness

01/12/2010 12:46 AM

Also, download file: Design_for_Pipes_of_Unequal wall thicknesses.

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