Thicker flange end in ASME B16.5
Thicker flange end in ASME B16.5
(OP)
I have a question:
Have you had a situation like: to have a thicker wall thickness in flange ending?
for example, consider the 16" flange with ID equal to 16" SCH 40 piping , but need a thicker wall thickness in flange side.
the problem is coming that I have pipeline pipe which is higher grade material like API 5L X52 (SMYS is 52 ksi) but I want to connect this pipe to B16.5 flanges 16" size but SCH 60 because it is A105 (SMYS 36 ksi) , I shall use Fig 1 of ASME B16.5, (internal tapering as Fig 2 ASME B16.5 is not permitted as per Z662 Canadian code for sour service).
So the question is how to make this flange
option 1- take 16" SCH40 flange cut back reach SCH 60 and then make hub as Fig 7 ASME B16.5, the question is , "Is this approach allowed by code or not?
Option 2: take a self reinforced flange and machined it to required dimension, again the question is : "Is this approach allowed by code or not?
Sorry for long story question , just I thought may be you have had similar situation in past?
Have you had a situation like: to have a thicker wall thickness in flange ending?
for example, consider the 16" flange with ID equal to 16" SCH 40 piping , but need a thicker wall thickness in flange side.
the problem is coming that I have pipeline pipe which is higher grade material like API 5L X52 (SMYS is 52 ksi) but I want to connect this pipe to B16.5 flanges 16" size but SCH 60 because it is A105 (SMYS 36 ksi) , I shall use Fig 1 of ASME B16.5, (internal tapering as Fig 2 ASME B16.5 is not permitted as per Z662 Canadian code for sour service).
So the question is how to make this flange
option 1- take 16" SCH40 flange cut back reach SCH 60 and then make hub as Fig 7 ASME B16.5, the question is , "Is this approach allowed by code or not?
Option 2: take a self reinforced flange and machined it to required dimension, again the question is : "Is this approach allowed by code or not?
Sorry for long story question , just I thought may be you have had similar situation in past?





RE: Thicker flange end in ASME B16.5
http://www.astm.org/Standards/A694.htm
Hope it helps.
Ibrahim Demir
RE: Thicker flange end in ASME B16.5
The reason why I did not select other high strength material (for example A694) is that this kind of material is not listed in ASMEB16.5 and so I do not have full range temperature - pressure rating, this is the reason that I have to select A105.
RE: Thicker flange end in ASME B16.5
For me you have two options.
1) take a 16" sch 60 flange and weld your sch 60 pipe to is and machine the inner corner of the flange at 1:4 or greater so that is matched the sch 40 flange it is bolted to with you sch 40 pipeline. As this is relatively unstressed material I cna't see why it is not allowed under the code
2) take two sch 40 flanges and then weld a sch 60 X 52 spool piece which is then machined down at the connection end to the flange to a sch 40 dimension at 1:4 or better and then weld your sch 60 A105 pipe to the sch 60 end of the spool piece.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way