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LS-DYNA uses a mesh. It is an energy method where the instantaneous static load propagates through the structure at the speed of sound. After each analysis step, the velocity/momentum of the material each integration point is reset to zero. I recently got an LS-DYNA analysis of external...

The British PD5500 code uses the crotch corner stress as the basis for nozzle reinforcement. That may answer some of your questions. There is also an explanation document which goes into further detail. It is something like PD5600.

Your bolted cover sketch is 35-35(c)? The minimum thickness for this type of bolted cover (without an opening) is calculated per equations (3.5.5-3) and (3.5.5-3), which equals 251mm. The 108mm figure in your calcs seems to be wrong. sqrt(0.3*666.752*88/186.673) = 250.68mm Even the 64.380mm...

Yes, an ordinary loose plate with an O-Ring seal. The vacuum maintains the seal. The loose plate has a chain attached to it so that it doesn't launch onto a person's head.

What is the Code? Is this stainless steel suitable for pressure vessels? I can find it in ASME BPVC.

A big hole in the jacket with a thick steel plate sitting loosely on top of it. This flat plate is held in place by vacuum. Internal pressure will cause the plate to simply fall off.

It does appear to come within the scope of ASME VIII. Perhaps design the annulus to take a one-off internal pressure test. But, oh for all the additional costs associated with inspections and testing.

I think that the strain numbers in PTB-3 are Plastic strain because at Yield you would expect plastic strain to be zero...ish. I think that Appendix 3D material curve is outdated. The current Appendix 3D produces a small amount of Plastic strain below the yield stress. In ANSYS, the user...

Do you know the difference between Elastic strain and Plastic Strain?

I assume you mean Hydrogen gas? Try searching for 'unstable' in this document. https://ec.europa.eu/docsroom/documents/41641/attachments/1/translations/en/renditions/native An unstable gas typically decomposes over time, causing an increase in internal pressure while doing so, or even...

You just add nozzle reinforcement until the MAWP of the combined cylinder-nozzle assembly is greater/equal to the MAWP of the cylinder alone. You can get an estimate of the amount of material required by doing a Div 2 design by rule reinforcing calc. Stress flow shouldn't have anything to do...

mk3223, did you study Shakespeare by any chance? Because I don't understand your comment. As far as I am aware, the definition of MAWP doesn't have anything to do with 'desire' or 'want'. Sometimes, a design based on the actual MAWP is done, so that if there are issues with the equipment...

If you have decided that the body plate wall shall govern the MAWP of the equipment, then set the required design pressure of all other components to the MAWP of the body plate wall, and then begin your design of those components from there. From what I read, it looks like you are trying to...

10mm of the unthreaded end of the half inch coupling is of 4.09mm thickness. The weld connecting the coupling to the vessel is approx 6mm away from the start of the thread. As Fig. UW-16.1 Note 1 refers to threaded couplings as nozzles, this 10mm length could constitute the nozzle neck, and the...

I read that as, if cycles exceed 10^6, then don't bother with the effort of screening for fatigue exemptions. A comprehensive fatigue assessment is required.

'Ask' with an explanation of "This is not possible without this information", seems to be the obvious next step.

Table UW-16.2 Note 1, refers to threaded coupling openings as 'nozzles'. The part of the coupling welded to the head, isn't threaded. If this was a full length parallel thread, then the thread would need to be considered when calculating the neck thickness. This half inch couplings is exempt...

The definition of the neck thickness does baffle me. I would have thought that it would be the thickness away from the thread. ANSI B16.11 requires 4.09mm thickness away from the thread for a half inch coupling. Subtract 1.6mm of corrosion equals 2.49mm. That scapes passed Table UG-45...

We have fed you with all the available resources. You also need us to teach you the reasoning and logic? And also provide you with a range of the results? Did you have any intention of putting in any thought of your own, so that we can learn from you? Or is this thread just a one way flow of...

If UW-16(f)(3)(-a)(-6) and Table UW-16.2 has been added in recent years then the 1984 interpretation is unlikely to be still valid. I deduce from "in lieu of the thickness requirements of UG-45", that if you have a fillet weld only, then Table UW-16.2 applies. Otherwise, if it is welded with a...