Cylindrical shell thickess

[AMinati]

I'm checking some calculations of my software for the minimum thickness of a cylindrical shell. I do not understand why I get different results if I use the formula UG-27 (1) from the one that uses the Mandatory Appendix 1 (1).
The condition "P does not exceed 0.385SE" is satisfied but I get the same results only if in the formula UG-27 (1) I consider R as the outer radius of the cylindrical shell and not the internal one as defined in UG-27(b) and specified in note 19: “For pipe, the inside radius R is determined by the nominal outside radius minus the nominal wall thickness.”
Where am I doing wrong?
Any help will be appreciate

Best Regards
AMinati

 

[SnTMan]

AMinati, OD formula and ID formula will give slightly different results. Either is acceptable.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand