Recent content by jgibbs22

Thank you for the follow-up posts everyone! I suspected it was not a cut and dry answer, but I will take a look at the non-mandatory appendix to at least understand the P-T ratings. Basically a client is under the belief that each piece of pressurization hardware has a "burst pressure"

Hello: I am curious if there are known burst pressure ratings for ASME B16.5 Flanges, and what safety factor is put on the design stress of these components would be. J

I would have to calculate the membrane values, but I believe they were around 17ksi. So if we operated int he creep range for 44 hours and had a certain amount of creep deformation, then no longer operated in the creep range, is there still a concern for long term creep damage? Or would the...

Hey Everyone: Had a general question regarding Creep concerns. If I have a SA-516 Gr. 70 vessel with a allowable temperature of 650 deg. F that runs for 45 hours at 800 deg. F: 1) IF the vessel will no longer see temperatures above 650 deg F, is there any concern for creep failure? 2) Does...

Also, that section refers to weld buildup, but not weld overlay. Are they considered one and the same for my question?

Thank you!! Is that the same for Division 2 as well??

Does the ASME Code (Division 1 or 2) limit the amount of weld overlay that could be used on a component to increase the overall thickness to handle a higher pressure? Example, if I had a 12" Diameter Carbon steel shell that is 1" thick, is there a limit to how much weld overlay could be put on...

Good evening everyone: I have a extremely large liquid oxygen sphere that was originally designed for liquid nitrogen at -320 deg. F, built back in the mid 60's. I have a need to sub-cool my liquid nitrogen to around -340 deg F. If I were to perform a Code alteration per NBIC, I assume I...

Thank you for the directive link! Do you have any insight into why the Code limits the MDMT to -320??

Thanks for the response! I have been trying to get my hands on the ISO or the European Code to try and dig into this folder. I believe the ASME Code limits you to -320 F, but I am hoping to go colder and maybe even design using Cold Stretching a Liquid Hydrogen vessel at low pressures...

Hey Everyone: I know that the 2013 Code recently adopted Cold-Stretching for ASS vessels, but I wanted to confirm the Code allowable limit to the MDMT. I thought the Code says -320 deg. F is the lowest it can be used at, but I was hoping someone could determine where that comes from? Do any...

Metengr: Thank you for the reply! It is a pressure vessel, about 20 psig, built to Div. 1 I was just concerned if the chemical composition changes from the current Code to the Code of Construction was different enough to warrant a different material, and if it mattered that it was Firebox and...

Hey Everyone: I am working on a repair specification for a vessel from the 50's made of SA-285 Grade C (Firebox). I have to put some overlay patches on some corroded areas, and was hoping to get some opinions on what material to use. Will new SA-285 Grade C be ok? Can I still ignore the PWHT...

ASME section VIII div 1, 4" schedule 5 nozzle with 4"slip on flange

Hey Everybody: Has anyone ever attached a nozzle to a cylindrical shell while only performing an external fillet weld? I want to do this for an alteration, and while I think I can, just wanted to see if anyone has done this before. Can you do it without any weld inspection if you are under...