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@geoff13 That makes a lot of sense thank you!

@TGS4: Using corrosion allowance is included in the nameplate thickness at least in my experience. @r6155: I don't sadly @LittleInch: When you say min design you mean T-min correct? @Christine74: Both the shell and heads. @mk3223: perhaps. also i notice in the older code books the phrase...

Throughout my career I have worked with a ton of older vessels, 30s, 40s, and i notice the actual readings on these vessels were higher than what the nameplate and Appendix G forms said. The nameplate and Appendix G forms don't normally say "nominal" but just "thickness". So why was it common...

Sorry I was looking at API 510. Based on what you just said it sounds like it doesn't make a difference since it's so small.

I feel a bit silly asking this question: how come for Tmin calculations, the radius or diameter isn't usually changed even when there is metal loss? I worked at some companies where the design radius/diameter was used but that does change a little over time due to metal loss.

@LittleInch: I didn't know that about small bore piping thank you!

@1503-44: Thanks for the advice @LittleInch: Thanks as well for the feedback. i was really hoping I can do this calculation manually but looks like i have to plug it into Caesar now. Halfway through that 4' span line (4" diameter) there is a 1" line that branches off from there. Can that be...

@KevinNZ Thank you @Snickster "Also standard tabes for pipe support spacing considers completely filled with water and maximum span deflection of about a half inch." That makes sense and I agree but why does API 574 11.1.3 say engineering calculations may be needed? In what circumstances?

@Snickster Thank you for the informative post! I learned a lot more on the importance of longitudinal stress. To clarify, this is an existing piping system. I'm a bit confused on the need to calculate structural thickness of a pipe according to that inspectioneering website. Also, API 570...

Hi all, I'm typically use the beam stress theory to calculation the structural minimum required thickness of a pipe. Here is the code that I'm using: https://gist.github.com/flare9x/94c29240a1be02f987872ef2f4e5f1be For reference, this method was derived from this article (paywall)...

Interesting. I'm having a ASME VIII stamped pressure vessel getting constructed for my plant. The info i have from the vendor says it's 304SS. I'm assuming I have to double check to make sure they used the ASME spec for that UNS? I'm assuming they would...

Thank you all for the replies. If i understand correctly, since the UNS number just specifies the chemical composition, a UNS number can have different product specifications?

I have a silly question in which I'm having a hard time wrapping my head around. ASME Section II provides specs for different types of alloys. For example, SA-693 has to have a certain chemical composition, material properties, tolerances, etc. From what i know, SA-693 is Stainless Steel...

Regarding pipe stresses, I have seen people on the internet say some plastic deformation is good since it redistributes the stresses along the pipe. How does this happen exactly?

Thanks Mate i was overthinking that one BTW do you know where I can find standard templates that companies use to record their acceptance test results on for the various NFPA codes?

Thank you UFT12 for the reply. What's the rationale behind not pressure testing surface foam piping?

This item says: "All piping, except piping handling expanded foam for other than subsurface application, shall be subjected to a 2-hour hydrostatic pressure gauge test" What does this mean: "except piping handling expanded foam for other than subsurface application"? Not sure what it's...

ASME VIII U-1(2) says the following: "Piping component, such as s pipe; flanges; bolting; gaskets; valves; fittings; the pressure- containing parts of other components such as strainers; filters; and devices that serve such purposes as mixing, separating, snubbing, distributing, metering or...

Those are some good points. I didn't think of the extra nozzles and openings that vessels have unlike pipes. One could argue that pipe contains store energy so for those that design very small vessels with very few openings, it almost seems it can get away with being built as a "pipe". I know...

When I look at the minimum thickness calculation in ASME VIII, I notice the calculation requires a greater metal thickness than say B31.3. Even if you account for the same material this is still the case. This a common issue with chemical plants when they design a small vessel using the Piping...