flange selection

[milind25]

how the flange thickness is decide

[marian_g]

Do you refer to welded-neck flange where the thickness of neck should be the same as for piping?

[barrerav]

how the flange thickness is decide

depend of the pressure that you are working. With this pressure, you have to use Asme b16.5, and choice the rating, with this rating, you get the thickness of the flange.

(sorry by my English)

Enviado desde mi GT-I9300 usando Tapatalk 2

[marian_g]

I think the difficulty to answer is because a flange is a complex body having more than one thickness.

"B16.5" flanges are following ASME B16.5 Code where dimensions are given in tables versus size and pressure rating; neck thickness need not be more that those corresponding to pipe/ piping class.

Special flanges must be calculated considering specialized codes as ASME VIII Div 1 or 2- for example.

[magdy_eng]

I think you shall decide first which standard you are following; ASME standards (B16.5 for sizes up to 24" and B16.47 for more than 24") or Euopean standards, because there is a difference between them espcially for large sizes.
This has been decided based on the type of valve or equipments you need to connect with your piping system and according to you system pressure requirements.
finally after deciding your standard you'll find all required detail for dimensions, thickness and No. of Bolts in each one.

[milind25]

thank you sir

[namasral]

apart from B16.5, ASME Sect 8 Div 1 have design procedure in defining falnge design as per Appendix 1-7 (for Large Diameter Flange). It will defined the flange thickness and dimensional parameter , Bolting requirement , Gasket selection. Dimensional parameter is first selected as per B16.5 for references before full analysis can be performed.

In fact different codes of standard flange is vary from one another. we have B16.5, B1.47-A & B (LARGE DIAMETER), API, JIS, AWWA

do have a quick look on this standard oil and gas flange

[ThaMaestro]

the guy doesnt even know what he's asking, nor what he needs.