Crown radius for torispherical head
Crown radius for torispherical head
(OP)
Hello,
I would like to know how to select or decide about the crown radius for a torispherical head for a vessel. Is there any relation of this radis to the shell radius for optimum design. In code it is said the knuckle radius dhould be 6 % od the crown radius, but nothing is stated about how to decide the crown radius.
Thanks
I would like to know how to select or decide about the crown radius for a torispherical head for a vessel. Is there any relation of this radis to the shell radius for optimum design. In code it is said the knuckle radius dhould be 6 % od the crown radius, but nothing is stated about how to decide the crown radius.
Thanks
"Knowledge is power"





RE: Crown radius for torispherical head
RE: Crown radius for torispherical head
But if you see the formula given in the code, the thickness of a torispherical head is :
t=P*L*M/(2*S*E-0.2*P) + CA
where L is crown radius
M=.25*(3+sqrt(L/r)) ris knucke radius.
From this I can conclude that thickness is proportional to crown radius, so I should keep it minimum possible. But is there any lower limit on it?
"Knowledge is power"
RE: Crown radius for torispherical head
The height of a formed head is a matter of size (total vessel length or height), sometimes may be related to the process, but is mainly a matter of cost (and of availability of course).
Hemispherical heads are the optimum for thick vessels, 2:1 elliptical are the commonest for medium to low pressures, and torispherical are well adapted to low pressures.
To get some figures you should design two or three heads for the same vessel and ask the head supplier for respective costs.
prex
http://www.xcalcs.com
Online tools for structural design
RE: Crown radius for torispherical head
Regards,
PEHasan
RE: Crown radius for torispherical head
RE: Crown radius for torispherical head
Regards,
Mike
RE: Crown radius for torispherical head
Also, watch out for "Minimum Thickness after Forming" issues. These can bit you if you don't conceder it.
Hope this helps,
jodyed