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We are quoting alteration of a large ASME stamped carbon steel tank. Alteration includes addition of am 18 inch bottom flange with 36” long water boot w/ 2” 150# flange on bottom. I'm not familiar with a water boot; can anyone provide guidance/information on what that might be. Thanks Jordan

Thanks for the response aslav. This was our conclusion as well. We looked at PG-109.4 but were a bit unsure on how to read the part "....which contains no pressure boundary welds....". Does this refer only to field installation or welds or those that were part of fabrication?

There are 4 new spools to be fabricated and installed as boiler external piping. Shop fabrication is welded, field installation is mechanical assembly (flanged and bolted) only. I understand that Form P-4A is needed for fabrication, but is From P-4B needed for field installation of these...

Thanks DSB123 and prex for your responses. Subsequent to my post we were able to work out the calcs per Appendix 2. It would seem the conclusion that there is no prequalifying standard is correct and turning to App 2 is the right route. I would have rescinded the post, but I didn't see a way...

I'm trying to use a 30 inch 304L RFSO flange under Section VIII. I understand B16.5 covers these up to 24 inches and B16.47 for larger diameters does not include slip-ons. Section VIII UG-11 allows for use of prefabricated pressure parts made to an ASME (i.e.; UG-44) or manufacturers standard...

Thanks for the response Christine.

Note 28 (Table W-3) for the minimum head thickness on line 8 of the manufacturer's data report states it is the "Specified minimum thickness of the head after forming. It includes corrosion allowance." I would like to be sure it means the minimum head thickness specified (what is ordered)...

On this subject, I have taken the minimum head thickness on U-1 Line 8 as the minimum thickness specified (what you are actually ordering), based on note 28, versus the calculated minimum thickness. This would seem consistent with the responses here, but I wanted to verify since this question...

We believe if we have a nozzle > NPS 10" or > 1 1/8" thickness, we need to use the joint efficiency from UW-12 on the long weld seam of the nozzle in addition to the weld factor in the allowable stress from Section II. The question is how does whether you spot x-ray the vessel section Category...

James thanks, this was my read and I thought this would provide the pathforward. However it now seems to be more complicated. What I have is jacket penetration, consistent with App 9 Fig 9-6 (b). on a Cat A seam. 9-6 (b) would suggest that reinforcements of the opening are not required for...

According to UW 3, shell to head welds are only Cat A with a hemispherical head. I'm specifically interested in a longitudinal Cat A shell joint. I may have thrown off the question referencing only UW-14(b). UW-14(a) says any type opening that meets the reinforcement requirements given can...

UW-14-b states that single openings meeting UG-36(c)(3) requirements may be located in Category B or C butt welded joints. Can a single opening meeting UG 36 (c)(3) be located in a Category A butt welded joint? If so under what conditions/requirements?

Thanks so much for your help prex; exactly the clarification I was looking for.

I'm trying to check some type 4 jacketed vessel with closure bars calculations (f-1 attached to shell, g-3 attached to jacket). I'm not clear on some of the values in the formula for calculating jacket space, j, given in (c)5 of Mandatory Appendix 9. The definition of symbols given don't make...