DSS Weld Overlay - Problems With PWHT

Hi Lawrence, Is there any mistake on the Mechie's post since he referring to the UG 66.1? I couln't find UG 66.1 in the code. For PWHT table is found in table UCS-56-1 to UCS-56-9, is't it? How could he reduce the temperature of PWHT? However, how I know which i should refer to the table UCS-56 for PWHT since there has nine table listed there?

I have an extra question regarding the slip on question. In Figure UW-21, it stated that the minimum welding dimension is the lesser or tn or 6mm and Xmin is the lesser of 1.4 tn or the thickness of hub.

Let's say the thickness of the nozzle is 8.18 mm, so the minimum welding dimension is 6 mm and the x min is 11.452 (approx 12) mm, am i right? So what is the gap distance between the slip on flange and the flange top? 6 mm + 1.5 mm = 9 mm ?

Many Thanks.

You are correct, the proper reference is Figure UCS-56.1. (Probably just a typo, as Mechie has the maximum reduction correct.)

I concur with your weld sizes: 6 mm on the inside and 11.452 mm (12) on the outside. I don't see a pipe end to flange face distance in UW-21. Check in B16.5 for any guidance. If there is none there, I'd suggest ASME Appendix 2, Figure 2-4(3) for guidance.

My inner and outer weld size is 6 mm and 11.452 (12 mm ) respectively. Yea UW-21 is never mention but Appendix 2.

According to appendix 2 Figure 2-4 (3), the maximum spacing between the slip on flange and the nozzle end is tn + 6mm. Thus , in my case the maximum distance is 6 + 6 = 12 mm.

Please correct me if i am wrong. Thanks!

Extra question: Is there has any minimum nozzle size in the ASME Code? As per my knowledge, it should have not right ?

6+6=12 looks right per Figure 2-4(3).

I don't believe that there is a minimum nozzle size. Table UG-45 goes down to NPS 1/8" [DN 6], which, I believe is the smallest size made. UG-36(b)(1) & (2) state that properly reinforced openings are not limite as to size... There are some restrictions on larger sizes, but not in the small direction.

Hi Lawrence,

I have some questions about UG-36(C)(3)(d).

The two 11/2" (DN40) nozzle is having different reinforcement area in Compress Codeware. The setting is exactly the same but one is exempted from UG-36(C)(3)(a) but another is calculated the reinforcement area. Is this related to UG-36(C)(3)(d) which cluster of nozzles un-reinforced opening in a row? But I don't really understand , can you explain to me? :)

Sorry and Many Thanks!

I don't know Compress enough to answer.

Sorry for the disturb Lawrence. Many Thanks! :)