Socket Weld Flange Design
Socket Weld Flange Design
(OP)
Modern Flange Design Bulletin 502 covers flange design for Integral (Weld neck and full pen welds), Loose (Lap Joint and SlipOn), and Optional (Butt weld to ring, etc). 502 does not address socket weld type flanges. What about the Code? I do not have access right now...I guess I need to get a copy. It has been about 8-10 years since I worked with the Code.
Also, B16.5 only shows socked weld designs through 3.0". I have a flange connection within some fluid handling equipment that needs to be compact style socked weld style...sizes up to 16".
I could just analyze it as a hubless ring flange...but my gut tells me that the lesser engagement of the pipe within the flange relative to a slip on flange will result in more load on pipe where it enters the socket.
Of course I could always to a quick FEA of a 3" B16.5 hubless slip on vs. a 3" B16.5 socket weld with the same pipe diameter...and that would tell me if my gut is right.
Any guidance? (Please note, Code compliance is NOT required...I think it is just good design practice to use it for determining design stess limits, safety factors, etc....)
Also, B16.5 only shows socked weld designs through 3.0". I have a flange connection within some fluid handling equipment that needs to be compact style socked weld style...sizes up to 16".
I could just analyze it as a hubless ring flange...but my gut tells me that the lesser engagement of the pipe within the flange relative to a slip on flange will result in more load on pipe where it enters the socket.
Of course I could always to a quick FEA of a 3" B16.5 hubless slip on vs. a 3" B16.5 socket weld with the same pipe diameter...and that would tell me if my gut is right.
Any guidance? (Please note, Code compliance is NOT required...I think it is just good design practice to use it for determining design stess limits, safety factors, etc....)





RE: Socket Weld Flange Design
This is ambient temperature range (40-110 Deg F), low pressure. Class 150...maybe Class 300. Due to the size of the flanges (6"-16"), the interior interface can be welded. The socket shoulder and the pipe end can be beveled, and the pipe welded to flange ID via a groove weld. Functionally...this will be a lot like a hubless slip on...but with less pipe engagement....
RE: Socket Weld Flange Design
Sec VIII has flange design rules you can check the design against.
Why the restriction? Why not just use a standard slip on?
Is there sufficient accessibility to make an internal groove weld on a 6"?
- Steve Perry
http://www.linkedin.com/in/stevenhperry
RE: Socket Weld Flange Design
ASME Section VIII Div I = Code
The is a specialized flange with a bearing retainer that will be squeezed between flange faces. This retainer will act as the facing/sealing surface. Slip wont really work as I need some meat to machine the recess for the retainer.
6" might be tight...but I think there will be room. 8"+...definitely...