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viksurs
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Join Date: Jul 2009
Posts: 2

Flange Hydro Pressure Analysis

07/20/2009 10:28 PM

as i know very well that u are too good in design related topic and i hope u can help me out in the problem which i am facing in flange thickness check for hydro pressure.. we the problem is as: 1.how to find go,and g1,,when it is weld neck flange or blrf flange and hence after finding all the values from sec 8 div 1 and calculating thickness of flange ...say me procedure to do thickness check for hydro pressure.. 2.and say me wheather bimettalic gasket are having same properties as spiral wound or what as i have to design which is having bi mettalic gasket reply me as soon as possible and if you do have 18.2. for bolt pdf then send me that to waiting for ur solution sir
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XMech
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Location: Western Canada
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#1

Re: flange hydro pressure analysis

07/20/2009 11:33 PM
  1. go and g1 can be found for weld neck flanges in Appendix 2 - Fig. 2.4:
  3. For blind flanges, go and g1 are irrelevant - you don't design with Appendix 2, but use UG-34:
  5. The flanges as designed will withstand hydrotest pressure - there is no need to check.
  6. If in doubt about gasket factors - Ask your supplier to provide values.
  7. Are you asking about ASME B18.2? Which one?: http://www.techstreet.com/cgi-bin/results?searchText=asme+b18.2&submit.x=0&submit.y=0&submit=1
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viksurs
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#2
In reply to #1

Re: flange hydro pressure analysis

07/21/2009 11:56 AM

still not clear can u say me the steps
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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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#3

Re: Flange Hydro Pressure Analysis

07/22/2009 12:44 AM

• For Standard Flanges, no need for any calculations, only you need to look at ASME B16.5 or ASME B16.47, where by knowing the design pressure and design temp., you can find the class or rate of flange. And by finding the class or rate, you can find all dimensions from the ASME B16.5 or B16.47.

• Design calculations are only required for Non-Standard Flanges. The hub thickness go is the thickness of the flange at its small end (neck), i.e. the thick. in which the flange shall be connected (equal to the thickness of pipe or shell where you need to connect your flange). Hub thickness at back of flange g1 can be assumed to be g1 = 2 go. See CR4 Thread Calculating Flange Thickness.

• For Blind Flange, refer to ASME VIII-1,UG-34. See CR4 Thread Calculation of blind flange thickness & How to calculate Blind flange thickness ?.

• Full design calculations as per ASME Code VIII-1 need at least 10 pages per flange.

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Abdel Halim Galala
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#4
In reply to #3

Re: Flange Hydro Pressure Analysis

07/22/2009 1:51 AM

Download the following sample of Flange_Design_Calculations.PDF.

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Abdel Halim Galala
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#5
In reply to #4

Re: Flange Hydro Pressure Analysis

07/22/2009 2:40 AM

Download the following sample of Blind_Flange_Design_Calculations.PDF.

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Anonymous Poster
#6

Re: Flange Hydro Pressure Analysis

08/12/2010 4:38 PM

We design a weldneck flange, ID=161.5", Shell thickness is 1.25". If we use G0=1.25", flange thickness is 7".

Can we use the first G0=1.625" for a straight section in the middle between two 1:3 slopes on hub, then get t=3.5"? (I mean the second G0=1.25")
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Abdel Halim Galala
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#7
In reply to #6

Re: Flange Hydro Pressure Analysis

08/12/2010 8:15 PM

Oh, no way to use go = 1.625", where go must not be more than 1.25", see the definition of go at my post #4, and see ASME VIII, Div. 1, Appendix 2 - Fig. 2.4 as illustrated at post #1 by XMech.

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