Pressure vessel with large lid
Pressure vessel with large lid
(OP)
We have to design a small pressure vessel (-10°C - 30°C, 50bar) based on a 4" pipe. The client wants to be able to take of the lid numerous times. He thought it would be nice to do this by welding a welding neck flange on top and close it with a blind flange. Well, I learned that you should always renew the gasket everytime you remove the blind flange. I don't think it is practical and wonder if there aren't any better solutions to be able to often open and close the vessel...





RE: Pressure vessel with large lid
Good for you for noting that the gasket needs to be replaced every time!
RE: Pressure vessel with large lid
RE: Pressure vessel with large lid
RE: Pressure vessel with large lid
I am now thinking of using a standard asme flange and put an O-ring groove on the raised face. Is this allowed?
RE: Pressure vessel with large lid
https://www.tubeturns.com/products/t-bolt-closures...
RE: Pressure vessel with large lid
I must tell you b.t.w. that my knowledge of the codes (PED in this case) is limited.
The idea of using a O-ring may be the best attainable solution for us. Only thing I have doubts about is that the surface of the blind flange is easily damaged/roughened up when handled without care and therefore the chance of leakage is large. Even I create a blind flange that has plug on it to create an axial seal, putting it in roughly can damage the surface of the hole. There is no room to put on a guiding mechanism for the flange.
I am a bit out of ideas...
RE: Pressure vessel with large lid
The T-bolt closure was just to give you an idea. Hint: Pipe Cap + T-bolt + O-ring.
They can be designed without using hinges.
RE: Pressure vessel with large lid
RE: Pressure vessel with large lid
De-pressurize the vessel, lift the cam lock, push in the PV lid into the vessel, twist and you can remove the lid with its thermometer intact. (Check clearances in 3D before fabrication.)
RE: Pressure vessel with large lid
The project leader just informed me he wants the standard flange with an O-ring. Other solutions are just too expensive and time consuming for now.
My question: does the PED (or ASME) prescribe anything about the use of an O-ring?
RE: Pressure vessel with large lid
RE: Pressure vessel with large lid
For design, youll need a design code, like ASME. Keep in mind not all design codes have conformiteit with the PED upfront, therefore require extra measures. Harmonized standards, like EN 13445 however, have conformity with the PED upfront.
RE: Pressure vessel with large lid
RE: Pressure vessel with large lid
Another popular option is a tri-clamp closure, but you'd have to move to 4" or 6" tubing to use it- they are not made in pipe sizes.