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If this is a Section VIII Division 1 vessel you are allowed to attached non-pressure parts using fillet welds with a throat size of up to 1/2" without having to perform PWHT per Note (b)(3)(c) in Table UCS-56-1. -Christine

I haven't read through the latest version of the NBIC code but I've seen many Repairs performed in the past where the contractor just stamped the company name/"R" stamp number/Date directly onto the vessel in the vicinity of the existing name plate without attaching a new name plate. Another...

It's because the exchanger has the same process fluid being routed through the shell side and the tube side, with one side being hotter after going through an exothermic reactor or similar process. If there are no valves that can be closed then maximum pressure differential that the tubes and...

I'm not familiar enough with Section I to answer the question, but my guess is that this is likely allowed. Check with your A.I. There is a false perception that anything that looks like a poor design practice is expressly prohibited by ASME Code, but the reality is that many things that would...

TEMA allows the use of differential pressure design where specified by the purchaser but doesn't provide any guidance on performing a differential pressure hydrotest. IOGP Standard S-614 just says that differential pressure heat exchangers designs must include a warning nameplate stating the...

Just to clarify what I believe the OP is talking about, the exchanger in question is most likely a high-pressure Feed/Effluent exchanger. As such, the operating pressure seen on the low-pressure side of the exchanger cannot be any less than the operating pressure on the high-pressure side minus...

Over my career I've reviewed drawings of hundreds of pressure vessels from dozens of different manufacturers, but not once have I seen nozzle bolt holes straddle centerlines in the needlessly complicated manner shown on CuMo's sketch. The bolt holes for offset nozzles typically straddle...

Krausen I can think of 4 reasons for performing roller expansion of strength welded tube-to-tubesheet joints: 1) Expansion closes the annular gap between the tube and the tube hole, thereby protecting against crevice corrosion on the shell side of the tubesheet. 2) ASME UHX tubesheet...

Not sure what is meant by Step 4 "Insert new tube sheet." A "retube" of a fixed tubesheet unit usually means that the existing tubesheets are salvaged. Are you just replacing one tubesheet or both? But your concern about a baffle breaking loose or collapsing is a valid one, especially if the...

You can solve for the shell-side outlet temperature by calculating the required heat duty based on the tube-side flowrate, specific heat capacity, and the inlet/outlet temperatures (assume that the heat exchanger is adiabatic). -Christine

As mentioned above you would do best in your interview if you had a solid understanding of the TEMA standard, API standard 660, as well as ASME Section VIII Division 1 covering flange design, nozzle reinforcement, tubesheet design, tube-to-tubesheet joints, internal/external pressure design...

If there are no changes to the design then I agree, the replacement bonnets can all be documented on an R-1 Report of Repair with no ASME U-2/U-2A Partial Data Reports. The only problem you might run into with this plan is if you don't intend ship the existing shell to the fabrication shop who...

The 11th edition was published in late 2023 but only became available for purchase on the TEMA website in the last month or so. Looks like they've made some significant improvements: https://tema.org/standards/ "Newly Added: Exchanger Type Selection Guide which discusses the benefits and...

Check with your Authorized Inspector but the Steam Drum is only a portion of the boiler proper so I would assume it would get an "ASME PRT" stamp on the nameplate and this would be documented on a P-4 Partial Data Report. If you decided to build the Steam Drum per ASME Section VIII Division 1...

You can insist all you want but ASME PCC-1 only covers Bolted Flange Joint Assemblies (BFJAs), and a header plug is certainly not a flanged joint. -Christine

I'm not aware of any air-cooled heat exchanger standards that provided recommended torques for header plugs. I'm used to just seeing the air cooler manufacturer's recommended torque values for the header plugs followed, but I found a previous thread here that describes a method for determining...

I'm used to seeing header plug gaskets specified as the same material grade as the header box itself. In some cases the header plugs are made from a slightly different material grade in order to avoid seizing/galling, but I don't know whether Alloy 625 threads have a tendency to gall. But I...

It seems like double-dipping but it isn't. You're paying a 15% penalty for not meeting the requirements of UW-11(a)(5)(b) plus another (unrelated) 15% penalty for not using a seamless product. If you didn't discount by 15% twice you would end up with a situation where the required thickness...

There is nothing unreasonable about the claim that a 19 ft-lb external moment applied to a Class 150 B16.5 flange could make it require a higher flange rating. -Christine

Nothing in Appendix 2 addresses holes drilled into the flange. In fact the bolt holes themselves don't even factor into the Appendix 2 flange analysis, so if the tapped screw holes are smaller in diameter than the flange bolt holes you can probably make a case for ignoring them. -Christine