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If I have a heat exchanger and the shellside is post weld heat treated and the tube side is not. What is my nameplate stamping in regards to heat treatment? Thanks!

When analyzing nozzle loads in Compress using the FEA package the program does not reduce the nozzle MAWP as a result of these added loads. The FEA output only identifies percent of stress in terms of actual vs. allowable. If I am performing MAWP calculations for a vessel how do I determine a...

At what lift weight should I set a lift lug thru the wear pad as opposed to on top of the wear pad on a pressure vessel? Thanks

Good point Boilerone. Also don't forget while you think you are saving money buying a thinner shell or head most of the time you are giving it all back and then some when it comes to added labor for nozzle re-pads and extra welding. Especially if you have to add re-pads to a half dozen nozzles...

If you x-ray after PWHT and you have a defective weld that needs re-work then you will have to re-heat treat that weld. Not sure what the benefit of that would be.

Vessel / heat exchanger fabricator here. I was thinking more along the lines of: Design Pressure: 346 psig Calculated MAWP (to be stamped on nameplate): 498 psig Limiting Component: Nozzle I understand that sometimes units require re-rating as time goes on. But re-rating involves many other...

Boiler mentions in his closing statement that "extra strength can be added to the nozzle". If I have numerous nozzles on my vessel of the same size that limit MAWP why would I want to add a re-pad to each one of them so that they are no longer the limiting component? Adding this extra material...

Correct, that limitation only applies to machining a round bar product form < 4"

But if the customer has asked for the limiting component of a design and no other specs exist then I believe it is still acceptable to limit by "Minor" components (nozzles, reinforcement, etc). I cannot see the difference in limiting between a minor or major component because in the end you are...

When the customer requires MAWP calculations. Is there an industry standard that dictates which component (heads, shells, nozzles) is allowed to be limit the MAWP for ASME code pressure vessels? thanks

Are these in Div. I ? I am having a difficult time finding them.

Does anyone remember the code case that clarifies area of reinforcement limits of nozzle in 2:1 ellip. heads? For example, if I have a nozzle that is offset from the centerline on a 2:1 elliptical head and the limits of reinforcement fall off the knuckle of the head can I take more credit on...