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The 9th edition of the Standards of the TEMA recommended good practice section of Section 5 Mechanical Standards TEMA Class RCB (RCB-10.7 Design of Large Diameter Ratio Shell Intersections Subjected to Pressure and External Loadings) offers stress equations based on the Pressure Vessel Research...

The plot thickens: Numerous discrepancies exist between the correlation equations appearing in the PVP 1279 graphs and those tabulated in the paper for the same parameter.

Thank you JStephen for the quick response. I guess we will never know what size repads the authors of PVP2002-1279 used in their FEA models. Upon further reading of the paper, my confusion only grows. The sample problem in PVP2002-1279 states that the example nozzle qualifies as a "regular"...

PVP2002-1279 "Stiffness Coefficients for Nozzles in API 650 Tanks" (published in 2002) makes the following statement regarding the FEA model for which it is based: "Nozzles were chosen to have reinforcing pads with equivalent dimensions of Table 3-6 column 5 of API 650." Older editions of API...

Geoff13 would you be interested in conducting peer-reviews of originally authored engineering topics concerning storage tanks? If so, what would be the best way for us to converse?

JStephen thank you for the extensive post that certainly generates much food for thought. During my research I have noted that many of the topics that you brought forth are not addressed by even the most popular books on the subject. I am going to take your points under consideration when...

Thanks Geoff13.

Great comments guys! Thanks so much Geoff13 for your comprehensive response. I must emphatically repeat a previous comment: The value of peer review is priceless.

Finally the answer: The API Standard 650 material groups are differentiated by the average values of longitudinal and transverse notch toughness impact values.

Finally the answer: The API Standard 650 material groups are differentiated by the average values of longitudinal and transverse notch toughness impact values.

Thank you for your response. To clarify, from the Standard regarding flush-type cleanout fittings: "When the shell material is Group I, II, III, or IIIA, the width or height of the clear opening shall not exceed 1200 mm (48 in); when the shell material is Group IV, IVA, V, or VI, the height...

Thank you IFRs for your thoughtful response; you are exactly correct, the required amount of reinforcement should read (11)(1.375) = 15.125 in2. The value of peer-review is priceless. Can you offer any comments or considerations regarding my 20 Sep 18 query regarding API Standard 650 material...

I thought I would try my luck here in the Metal and Metallurgy engineering forum on this one. It has been five days without a single response since I posted this same question in the Storage Tank engineering forum where I surmised it to be more appropriate: What is the underlying factor or...

The book is entitled Design and Analysis of Openings in Steel Tanks and Pressure Vessels. As the name states, the content is limited to penetrations in steel vessels but it does include large openings formed through conical reductions. Standards 620 and 650, ASME Section VIII Division 1, and to...

Attachment corrected from previous posthttps://files.engineering.com/getfile.aspx?folder=5b1f9b3d-be3c-4d5d-a0f3-20db8656ca7a&file=Example_9_point_1_(corrected).pdf

See the attached worked-out (and unchecked for accuracy) example extracted from a yet-to-be published engineering textbook.https://files.engineering.com/getfile.aspx?folder=30b7bc56-190d-4425-aba4-4e3810d29cc4&file=Example_9_point_1.pdf

What is the underlying factor or factors that differentiate the API 650 material groups. This question was raised when I observed that a flush-type clean out fitting's maximum opening dimensions are dependent on material group number. I cannot find a simple definition of material group other...

Thank you both for your responses. Sometimes I tend to make too much out of something that is quite simple.

Would anyone care to comment on the meaning of the term "vertical diameter" in the following passage from API 650? "The minimum cross-sectional area of the required reinforcement shall not be less than the product of the vertical diameter of the hole cut in the shell and the nominal plate...

Christine74 For what it is worth, and that maybe actually in fact nothing, the mean g1/g0 ratio for ASME B16.5 service rating 150 weld neck flanges sizes NPS 1/2 inch through NPS 24 inch is 3.17.