wall thickness calculation

[prens11us]

Hello all,

I want to calculate the wall thickness of 48" R=5D induction bend for onshore pipelines. (hot bend)

Is the procedure same as calculating w.t. of straight pipe acc. to B31.3?

In the standard there are som argument about SIF. Is the wall thickness of hot bends is related with SIF.

Thanks in advance.

 

[NozzleTwister]

Shouldn't you be using the equations in ASME B31.4 or B31.8 to calculate the wall thicknesses for pipelines?

NozzleTwister
Houston, Texas

 

[odem]

Be sure to take a look at the backwall thinning associated with pipe bending.

You might check the International Pipe Association Voluntary Bending Standard (IPA VIBS-86). It gives some recommendations about calculating the wall thickness for induction bends.

 

[bulkhandling]

Is there any problem with the para. 304.2.1 Pipe Bends in B31.3?

 

[prens11us]

I am using B31.4 for calculation. it says use 75% of allowable stress for wall thickness calculation. Is it enough for calculation.

Should I do something about SIF.