Page 236 - Pressure Vessel Design Manual

214 Pressure Vessel Design Manual

a Determine if reinforcement is required. Maximum distance to centroid of ring
X = smaller of S,E1 or S,E2
Y = greater of S,E, or S,E, L, = 0.25JRstl

~~
Reinforcement Required at Large End Due
A = (from Table 4-3) to External Pressure

Note: A = 30" if P$x > 0.125
a Determine $reinforcement is required.
If A < a, then reinforcement is required.
If A 1 a, then no reinforcement is required.

a Determine area of reinforcement required, A,.

A = (from Table 4-4)
Note: A = 60" if Px/SsE1 > 0.35
El = 1.0 for butt welds in compression
If A < a, then reinforcement is required.
If A 2 a, then no reinforcement is required.

a Determine area of reinforcement required, AL.
PRS
t.-
'' - &El - 0.6P

PdS
t,, =
2 COS a(S,E2 - 0.6P)
AL =z
a Determine area of ring required, A,.
where FL is the largest compressive force at large end.
tl
in = smaller of -cos(a - A)
t2
or
Table 4-4
A Degrees

0 0
A, = m&[ (tci - -) trc + (tl - t,)] 0.002 5
cos a 0.005 7
0.010 10
0.02 15
A, = A, - A, 0.04 21
0.08 29
If A,. is negative, the design is adequate as is. If A, is 0.1 33
positive, add a ring. 0.125 37
0.15 40
0.2 47
a If a ring is required. 0.25 52
0.3 57
Maximum distance to edge of ring 0.35 60
=a From ASME Code, Section VIII, Div. 1. Reprinted
by permission.