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Question: Per UG-36(a)(1): "When the long dimension of an elliptical or obround opening exceeds twice the short dimensions, the reinforcement across the short dimensions shall be increased as necessary to provide against excessive distortion due to twisting moment." What is the twisting...

The issue is contractual, not a Code issue. I do believe that the HX meets the requirements of VIII-1 with the analysis on the one component. You specified Section VIII-2 be used for fatigue analysis and my guess is that the Manufacturer is claiming exception based on Paragraphs 5.5.2 of...

Get an "R" -stamp holder to perform a Alteration re-rating of the vessel. Just run the calcs for the pressure/temp you are wanting and have a CI sign off on it.

If there are no welds then there are no weld categories or joint types. If there are no weld categories or joint types, UW-12(d) would not apply since you having nothing which puts you into UW-11(a)(5)(b). E = 1 for the channel shell. The tube sheet ligament efficiency will be per Part UHX...

jte I agree. Making a Design Spec. mandatory in VIII-1 would solve the lingering doubt over whether UG-22 loadings have been sufficiently addressed by the Certificate Holder. It seems VIII-1 has always considered such due diligence to be a contractual issue rather than a Code issue, which I...

You can also check CSD-1; Controls and Safety Devices for Automatically Fired Boilers for the ASME recommendation. Look in Appendix D. Many Jurisdictions use this as a guide.

muld0020, I'm not entirely sure I understand the design you describe, but for seamless tubing which does not contain the welds described in UW-11(a)(5)(b) the requirements for spot radiography in UW-12(d) would not apply and would allow E = 1 for you circumferential stress calcs. Regards.

Justolejim, The 3000 psi pressure mentioned U-1(d) is not a design limitation of VIII-1, but rather a parameter beyond which it might not fully address design issues. Keep reading the rest of the paragraph you cited and you will see that design pressure above 3000 psi does not preclude Code...

Almost forgot, but if you are interested in obtaining your own Certificate of Authorization I recommend getting in touch with a well-reputed Authorized Inspection Agency such as HSB Global Standards (http://www.hsbct.com). An AIA can provide you with lots of good information. I will caution...

solidpoly, You are correct, you will not have to meet Section VIII Division 3. Here are the pros and cons of each Division: VIII-1: Pros: Cheaper Proven viability Thousands of U-stamp Manufacturers available Cons: Cook booked Thicker, heavier wall thicknesses (typically) Fatigue not...

You know, you can use any of the divisions (1, 2, or 3) from Section VIII to design a pressure vessel. Code even mentions that each subsequent division does not intend to place a limit on the preceding one. Having said that, for isostatic processes (which are typically beyond the 10 ksi...

solidpoly, Yes, it is probably best to apply the rules of Division 2 to this design. You can use Division 1, but you might have to take into consideration some additional loadings that are not addressed in that Code. If this is going to be a Code-stamped item, you are going to want to make...

kevinkzh, Basically, Code is allowing you to use material that is not listed in either Tables HF-200 or HC-200 for non-pressure retaining parts. If you opt for this route, then you must take the following under consideration: Material used for non-pressure parts must of weldable quality: How...

All, Yes, this is an error which did not get caught prior to final printing. The new weld dimension requirements in UW-21 were extracted from B31.1 and should mirror them in the upcoming Errata. In the meantime, BradLancour is correct: 1.4tmin should read 1.4tn. Xmin = 1.4tn or thickness of...

Jordan123, If this is welded pipe with no Category B or C butt welds, the requirements of UW-11(a)(5)(b) do not apply and you could use E = 1 as directed by UW-12(e) and UW-12(d) for your UG-27(c)(1) calculations. If this a rolled plate nozzle the joint efficiency would be from Table UW-12 for...