Page 254 - Pressure Vessel Design Manual

232 Pressure Vessel Design Manual

For E6OXX Welds: ts = 1.75 in.

w =- VdY S, = 0.8
9600In a = 15 ft
AT = 500 - 70 = 430°F
~ ~~~
Sample Problem
e Find bafle thickness without stiffener
e Given: Horizontal vessel with a vertical baffle
62.4aSg
p=-- - 5.2 psi
P = 250 psig 144
15
D.T. = 500°F a ratio = - = 0.75
material = SA-516-70 6 20
C.a. = 0.125 in.
JE = 1.0 From Table 4-8, Case 1:
E = 27.3 x 106psi
= 0.16 ~1 = 0.033
a! = 7.124 x in./in./"F
F, = 30.8 ksi
Thickness of bafle, tb.
D = 240 in.
Fb = 0.66 F, = 20.33 ksi
R, = 120.938 BlPb2 - 0.16(5.2)2402
tb = J-Fb - / 20,330

tb = 1.53 f 0.25 = 1.78

No good! Use stiffeners.
e Assume a suitable ba& thickness and determine mxi-
mum panel size.
tb = 0.75in. corroded
maximum panel size = 4ft x 4ft

Maximum pressure, p.

13(62.4)0.8 = 4.5 psi
'= 144
a 4
6=4=l

See Table 4-8, Case 3:

83 = 0.287 y3 = 0.0443

I = 0.287(4.5) 4S2

Figure 4-16. Sample problem. 0.752 = 5290 psi < 20,333 psi