thank you marty007. I agree with your comments pertaining to Compress but feel it does have functions to fully calculate an O'let if the user enters the correct information. I would disagree with you that an O'let is not per Fig. UW-16.1 sketch (a) but in fact per Fig. UW-16.2 sketch (m). This...
I agree with you and in essence you are answering my questions. Yes, they aren't listed in table U-3 but my supplier has designed the vessel on a 2" shell to have one. Within Compress, you have three choices when designing a nozzle; uniform thickness (which an O'let is not),variable thickness...
thanks for your response. I consider UW-16(f) since its welded on the outside of the shell only and is finished by a fillet weld. Yes, its designed for full pen, but the full pen is thru the fitting not the shell. A TOL actually falls under MSS SP-97. I don't want to use them (TOL's), my venders...
I am needing help with the use of O'lets on Sec. VIII Div. 1 vessels when the shell thickness is greater than .375". My thoughts are they aren't allowed per UW-16(f)(3)(a)when welded from the outside only. Many people argue its full pen. buts its full pen thru the fitting followed up with a...
