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Hello, Does anyone knows the background of UG-45? Why is it introduced in the code? I was told the reason is the nozzle load. I don't see any logic behind it since "ta" already requires us to include all UG-22 loads (i.e. including piping load). Does anyone understand the background of UG-45...

Thank you Geoff13! Yes, this is for specific component. Is there an interpretation for this? To show it to the AI, if he asks for it. Thanks!

Hi, it looks like there is nothing about UCS-66 (i)(4) on the forum. UCS-66 (i)(4) quote: "The MDMT adjustment as determined in (1) above may be used for impact tested welding procedures or production welds." Does this mean that MDMT reduction Ratio (R) calculated for base material can be used...

Hello, The vessel is designed as ASME VIII-1. Special Loose Type Flange (Seal Ring) is welded to the shell. The applicable code sketch, for welded joint size, would be Figure 2-4 sketch (3a). Due to special design of the seal ring (the Loose Flange) we cannot provide weld throat of min.=0.7*c...

Hi Mike (SnTMan), So your understanding is that UG-99 (k)(2) apples to metallic linings also? Thanks.

UG-99 (k)(2) quote:" when internal linings are to be applied,the pressure-retaining welds shall first be leak tested in accordance with Section V, Article 10." Is the above applicable only to non-metallic linings since UG-99(k) talks about painting and coating? Appendix 3 definition: "lined...

Hello, There is a center tubesheet, welded to shell on both sides. Per ASME VIII-1, what would be requirement for the "tp" value in this case? See below sketch. Would ASME VIII-1 consider just the center part of the tubesheet as "tp" (same OD as shell), or is it safe to consider that "tp"...

Thanks guys! MillerSu, They have accepted UG-101(p). I argued that flat end plates have the same failure mode regardless of the side where the pressure acts (internal overpressure or internal vacuum). Same is with UG-34 and UG-39.

TGS4, Well they are focused on the word COLLAPSE. Which acc to them would be for external overpressure or internal vacuum only. Our unit is designed for internal overpressure. Now, in ASME VIII-1 I was only able to find some reference to collapse in Appendix 23 where it says "(a) Test three...

TGS4, Yes, you might be right. No "excessive deformation" does not really specify what the deformation should be, and it might result in the same MAWP as UG-101(m). But let's focus on UG-101(p) only, would you think that it would be applicable in our case?

Hello, Read U-1 of ASME VIII-1. It defines when "U" stamp is required.

Hello, I have a brazed heat exchanger that consists of multiple flat plates brazed together. Such brazed flat plates form multiple channels. The exchanger looks like a box - like a square. Construction is too complicated to be evaluated per UG-34 or any other paragraph of VIII-1. Therefore...

Hello, I have SA-53E/B (welded pipe) used as a shell. ASME section II partD gives 14600 psi for max allowable stress at 200F. In notes it is indicated that this value (14600 psi) includes 0.85 joint efficiency factor. I read the UW-12 and my understanding is that I can use E=1 in UG27 formula...

doct9960, Thanks for your replay! jakov11000

Thank you all!

Thanks D2HANDLE.

Hi, can we use appendix 1-7 for non radial openings? I am reading App 1-7 (b)(1), but still am not sure if this is only applicable to radial nozzles. Thanks

Hi, A nozzle has been welded to a flat cover (fillet weld). After measuring throat thickness of this fillet weld (two days after welding) it was discovered that there is 1mm less than required thickness. Can additional layer of weld be simply added to fulfill required (per UW16) throat...

Hi, I have 3/8" opening on a head (the head is ASME B16.9, sch 80 cap welded to a nozzle - 6" pipe sch80). The 3/8" opening (drilled through whole thickness of the head) is located in the center of the head and is used for venting. The opening is closed with hex plug made acc to ASME B16.11...

Hello, I am reviewing a design of heat exchanger - cilindrical shell (heat transfer plates inside) with flat heads designed to ASME VIII div 1. Each flat head have 8 partially drilled holes (d=25mm). Holes are 40 mm deep and are drilled in 50 mm thick flat cover (Cover material SA516Gr60 -...