ASME Section VIII Div 1 UG-16(e) & UW-21

[FoxRox]

I found some other topics about this, but I just want to make sure the answer is explicit and specific.

On an ASME pressure vessel (not a pipe), when determining the required fillet weld size on the external leg of an B16.5 slip-on flange, can you subtract the corrosion allowance from the nominal wall thickness [per UG-16(e)] before calculating the weld size?

Example: .500" wall thickness w/ .125" corrosion allowance.

External fillet size per UW-21 = (.500-.125)*(1.4)=.525 minimum
External fillet size per UW-21 = (.500)*(1.4)=.7 minimum

Which is correct?

Thanks!

 

[david339933]

UG-16(e) is applicable in all instances except where noted, such as UG-16(d) which references UG-37/40.
Same applies for UW-16 weld sizing.

Standard Designation: BPV Section VIII Div 1
Edition/Addenda:
Para./Fig./Table No:
Subject Description: Section VIII, Division 1 (1989 Edition, 1989 Addenda), UW-16(b)
Date Issued: 01/22/1991
Record Number: BC90-792
Interpretation Number : VIII-1-89-272
Question(s) and Reply(ies):
Question: Are the symbols defined in UW-16(b) to be applied in the corroded condition?

Reply: Yes. See UG-16(e).