Locally thickened shell area - Can you do it?
Locally thickened shell area - Can you do it?
(OP)
Has anyone had any experience with using a locally thickened area of the shell around a large diameter nozzle so it meets reinforcement requirements? This would be like a flush patch with thicker material then the rest of the shell. Sec. VIII Div. I
Is this a common practice? How far around the nozzle do you extend the thickened area?
Thanks
Is this a common practice? How far around the nozzle do you extend the thickened area?
Thanks





RE: Locally thickened shell area - Can you do it?
EXTEND ENOUGH FOR IT TO BE GOOD IN CALCS PLUS ENOUGH FOR THE 3:1 TAPER .
RE: Locally thickened shell area - Can you do it?
RE: Locally thickened shell area - Can you do it?
RE: Locally thickened shell area - Can you do it?
Its called an "insert plate". I've typically seen the ID kept the same (don't want to get the process engineeers fussy about the ID) so the excess thickness is on the outside, similar to a repad. Make sure you put a 3:1 taper on the transition.
Insert plates are commmonly used on large nozzles as well as high temperature and in fatigue service and I've seen some cases where multiple nozzles were in close proximity so rather than use several repads a single large insert plate was used.
jt
RE: Locally thickened shell area - Can you do it?
RE: Locally thickened shell area - Can you do it?
It is good engineering practice to have material for pad to be of equivalent strength as shell or greater.
Does same limits of reinforcement applies on insert plates ?
RE: Locally thickened shell area - Can you do it?
Regards,
Mike
RE: Locally thickened shell area - Can you do it?
Thus, it is not unusual to see rectangular (with radiused cornes insert plates which far exceed the limits on area availale for reinforcement.
jt