There are several vessels in service that require new nozzles. The question has been asked can we do a full pen weld through the nozzle wall and not cut into the shell until later when a hot tap will be done on them. They want to hydro the nozzles against the shell before it is cut with the...
We are a div 1 shop in the USA and want to use this code case for future vessels. Since this code case allows some methods of determining thickness from div 2 does this in turn mean a PE has to sign off on those calcs (since a PE has to sign off on all div 2 calcs/vessels)?
The only thing I...
We are working on stainless vessels that are to be passivated, my question is it ok to do the passivation AFTER hydro?
I thought that anything that changed the properties of the weld or material in the pressure boundary had to be done before hydro (like with PWHT), but others are saying its ok...
There is a customer that has a "design pressure" of 5 PSI, but then they are also asking to design for an 'extreme overpressure event' of 150 PSI in the event of a damaging event that is possible with this vessels service, they say they are adding this to the design so that the vessel would not...
I have a hillside nozzle in a shell (nearly tangential) and we are having trouble getting to the fillet weld on the inside of the shell/pipe junction because the pipe is so close to the shell. In UW16 I didn't see any type of weld that allows an inside penetration without having to weld the...
I was wondering how to establish the correct meshing size in FEA. Where should a smaller mesh size be used and how much smaller should it be? Is it always best to use as small of a mesh as possible to get the most accurate results? Any tips or good books/articles on meshing would be...
I am going to take an FEA class to get a better background and become a better software user (I am pretty much a beginner), I have a MS in Mechanical Engineering, so have a good science and math background but have no FEA specific training. I am using Inventor Professional, and would use the...
Section VIII Div 1 doesn't explicitly prohibit the use of certain shapes for openings, other than corners must have a radius (doesn't specify how much of a radius), but it recommends circular, ellipsoidal and obround. My question is, if we have a shape not covered in the nozzle calculations...
I am attaching a nozzle with a through fillet (P-1 material), the sizes of the fillets are 3/4" on one side and 7/8" on the other, there is abate in the office as to whether this has to PWHT or not, it looks to me under UW-40(f) that the nominal thickness is taken as the largest fillet, another...
There has been a bit of conversation around the office as to whether the BPVC calculations are actually 'design' or not, mainly for insurance reasons, what do you think?
It seems to me that since we are deciding the thickness and components that we are doing design work. I don't see it as any...
I'm using UW16.1(a) which is a full penetration through the outside of nozzle, my question is how do you determine the degree of bevel required to be applied to the nozzle on a tangential weld?
Hi,
Am planning on removing a pair of flanges connecting two vessels via a 12" sch10S piece of pipe and replacing with a pup piece of pipe (eliminating the flanges as they leak in a high heat and high caustic service), my question is since Section VIII specifies that the code is ended at the...
I know its poor engineering practice to put a nozzle on the outside of a head going through the knuckle radius, but my question is does the ASME Section VIII div 1 Code allow (or prohibit) a nozzle that is truly tangential with the OD of the Head (or Shell), that is to say can a nozzle with the...
Hi,
The company I work for is looking at purchasing a PMI gun, I have been in contact with many suppliers but due to our specific needs the companies we have narrowed the choice to are Olympus, Niton, Bruker (in that order) and because of our need to distinguish carbon steel we are looking at...
I was told here that any flange over 24" has to be calculated using appendix 2. I just accepted this as a rule to the code, but now I'm wondering where this 'rule' is located.
In UG-44 it states that the following ASME standards are acceptable and in these standards (UG-44(h)) it lists...
Can someone point me in the right direction to see if direct fire on a KO Drum is acceptable in the code, is there any specific BTU loads that are ok?
A customer wants to put several 500,000BTU burners on the bottom of the tank to warm it up, which sounds like a dangerous and stupid decision...
Hello all,
I am a Masters Student and an engineer and am curious as to the relevancy of getting my PE with my focus being on pressure vessels. At the code shop I work at there is no PE that signs off on vessels, as this is not a requirement of the code.
So, is there an application of a PV PE...
Reading from "Chapter 11-Seismic Design Criteria" in the book "Minimum Design Loads for Buildings and Other Structures":
The first paragraph states: "The specified earthquake loads are based on post elastic energy dissipation in the structure, and because of this fact, the requirements for...
