Ok thank you for addressing my concerns about the hot tap (something we would sub out).
So if this is industry standard then that means the metheod of hydro they propose is ok too? If so how is that ok with ASME Code, as the hydro doesn't pressure all pressure parts being modified (the nozzle...
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...
http://www.eng-tips.com/viewthread.cfm?qid=27356
The above link has some great info and several equations for doing this calculation (as well as other head shapes).
I usually draw a solid model and get the volume and calculate the weight from there.
Or there is this spread sheet that has...
Thank you for all the replies, to clarify it is 9' diameter, carbon steel and large enough to be considered a Code vessel. According to the Owners Agent, the failure condition is for a dust explosion (which would produce about 150 PSI). I recommended a burst plate or other means of safely...
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...
Can't trim the nozzle flush because its an internal projection.
Yeah I want to do full penetration weld from outside only, design passes without repad or too much outside weld.
I just didn't see a design that allows for internal projection without some weld (43) on the backside, didn't know if...
Maybe an easier way to phrase my question; can you have a nozzle with internal projection that is full penetration and fillet on the outside, but omit the internal fillet?
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...
Yeah that class is the type of thing I want to attend, I think my company will pay for me to go the ASME course since it's online and I don't have to travel very far and its much less expensive. I think the one you listed would be better but I can't pay to attend that and, although I will try...
Do the ASME calcs cover Pressure Thrust, I don't remember seeing anything in there about it. Is the thrust equal to a point force of the pressure times the area?
About evaluating stresses, I used the Section II stress values for the stress in the analysis at the correct temperature, is there...
