Hi all,

1) I have a question regarding use of pipe caps for thermal sleeve nozzles where we use two pipes with a clearance of 6 to 12 mm bewteen OD of inner pipe and ID of outer pipe.
I am using pipe cap on the outer pipe and a hole in the pipe cap to run the smaller pipe through it.
MY concern is how to analyse pipe cap based on calculations. Even if i consider pipe cap as a 2:1 Semi-Elliposidal head, the hole size is bigger than 0.5 time the dia of the pipe cap and as per ASME I, this might not be allowed.
I need a way how to justify my design to use pipe caps having a hole in it with a pipe running through it bigger than 0.5 times its diameter.


2) what is the good engineerign practice to use set on nozzles for vessels, any dia range and pressure or shell thickness limitations to consider as a good engineering practice.
Thanks