Applications of socket weld flanges
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I would like to ask: in what situations are socket weld flanges generally used? I know it is generally used for small pipe diameters, but are there any requirements regarding pressure ratings and pipe types? I haven’t had much experience with this, so I hope someone can tell me. Thank you
Socket weld flanges: commonly used in pipelines with PN≤10.0MPa and DN≤40
Are there any specifications regarding the medium in the pipeline?
As an additional note: For pressure pipelines with strict requirements for radiographic or ultrasonic testing, especially those that require 100% radiographic testing, flanges, fittings, etc. should not be fabricated using the socket welding method (i.e., butt welding); instead, a butt-welded design is preferred. For reference!
Socket weld flanges are used for pipes with a pressure lower than PN5.0, a diameter of 40 DN or less, and whose material is mainly C.S
So my pressure rating is 2.5 MPa, and it’s also a small diameter pipe. The medium in the pipe is nitrogen; can buttweld flanges be used for propylene gas?
If the nominal diameter of the pipe is greater than 25 mm (DN＞25 mm), depending on its pressure class and the properties of the medium, such a pipe should be considered a pressure pipe; it is recommended to use a butt-welded structure； The reason is that it can ensure the quality of pipeline welding while also meeting the relevant flaw detection requirements. For reference!
So, for pressure pipelines, it’s better to use butt-welded flanges? Is that what you mean?
The understanding upstairs is incorrect; there is no rule stating that socket welding is not required for pressure pipelines. The media you mentioned are nitrogen and propylene, with a pressure rating of 2.5 MPa; pipes with a pressure level of less than or equal to 50 can be welded using socket welding. Plug welding also has no stipulation prohibiting its use on stainless steel.