loilfan
Mechanical
- Jan 20, 2015
- 122
We are looking to modify a pressure vessel so that it has a finished opening 1 7/8" diameter in a 3/8" plate. A pad is placed on the inside of the shell and is threaded in place by a threaded flex hose hooked up to the nozzle. The opening will not be near any discontinuities or welded joints.
If you remove the pad and the flex hose, all we have is a single hole as if it had just been drilled out. i.e. If I did the reinforcement calculations, all I could have for available reinforcement is A1 (Area available in Shell).
I do not consider UG-36(c)(3)(a) to apply since the connection has not been welded, brazed, or flued. Does UG-36(c)(3)(-b) apply even though the threading for the connection is in removable components? Or is the intent that the threaded, studded and expanded connections are only in the shell?
If you remove the pad and the flex hose, all we have is a single hole as if it had just been drilled out. i.e. If I did the reinforcement calculations, all I could have for available reinforcement is A1 (Area available in Shell).
I do not consider UG-36(c)(3)(a) to apply since the connection has not been welded, brazed, or flued. Does UG-36(c)(3)(-b) apply even though the threading for the connection is in removable components? Or is the intent that the threaded, studded and expanded connections are only in the shell?