@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...
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.
@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?
