Dear All,

As I understand ASME B31.4 - 2012 defines two conditions of a pipeline, "Restrained" and "Unrestrained"

For "Restrained" pipelines the code requires an assessment for the operating load case (OPE) where it compares the longitudinal stress SL (computed for restrained case and including thermal stresses)to the allowable stress S=0.9*SMYS.

For "Unrestrained" pipelines the code requires an assessment for a sustained load case (SUS) where it compares the longitudinal stress SL (computed for unrestrained case from pressure and external loadings) to the allowable stress S=0.75*SMYS.
and also requires an assessment for an expansion load case (EXP) where it compares SE to SA.

So it somehow adopts the same philosophy of ASME B31.8
Is that true? Please correct me if I am wrong.

Also does CII follow this procedure (if it is true)? and starting from which version?

Regards

Dear Richard/Dave, can you assist me in that?

CAESAR II still implements the 2006 edition of B31.4 (due to errors in the following editions of this Code). The 2015 version of CAESAR II will address the 2012 edition of B31.4, which appears to have corrected the errors.

Yes, I believe that now B31.4 aligns (again) with B31.8 regarding restrained vs non-restrained piping.

Thanks a lot

Dear Richard,

Do you know when the 2015 version (with ASME B31.4 2012) will be released?.

thanks

CAESAR II 2016 (v.8.0) is scheduled for the end of September 2015.