Page 105 - Pressure Vessel Design Manual

86 Pressure Vessel Design Manual

Table 2-13
Comparison of "Local Buckling" Stress Equations
Example
leference Formula, ac, Parameters for Example In Table 2-13
Aichielson 0.194E (&) 15,789 5263 t = 0.25 in.
1948) (1)
1 E = 29.5 x lo6 Dsi
(irste (1954) (1) 15,219 5073
0.187E(&)
---- R. = 90in
(empner 14.812 4938
1954) (1) 0.182E(&)
Do = 180 in
='ogorelov 13,022 4341
1967) (1) 0.160E($)
Fv = 36 KSI
4lcoa (1950) (1) 12.880 4293
34,700 - 11 50E L = 90R

NA 5041
I = xR$t = 570.173in.4

Timoshenko (1936) (1) 48,833 16,278 A=2nRmt=141.18in2
0.6E(&)
~~
AIS1 (Planiema) (1)(2) 14.365 4788
+ O.399Fy
DO
~
8112 4056 A=-- (0.12%) [0.125(0.25)] - o,ooo347
Baker (3) 90 90
~
1l.llOor 9870 6580 B = From Fig. CS-2 = 5000 psi
Wilson-Newmark (1933)
(4)
NA NA Do = !?! = 0.00139
180
Marks Handbook Do 180
_=--
(Donnell 1934) NA 5737 t 0.25-720
0.56tE
1<0.00425 ___
D- D(1 +y)
0-25
=
I 0.00278
=
R, 90
(0.6tE) NA 5738
F, c 30KSI ~
D(l +y) R, 90
_=_= 360
Fluor (3) t 0.25
NA 4945
Fv z 30KSI 3558(;)KSl
L 1080-6
Do 180
ASME Factor "B" (3) A=- 0'125t NA 5000
R.3 B = from applicable curve - = 12
L
RO
Von Karmen-Tsien 15,979 5326
(1941) 0.195E(&)
R. = 0.0833
L
AWWA D-100 NA 6744
L
< 25
L 1080 -17
_=_-
r 63.55
Notes for Table 2-13:
1. Uses a 3:l safety factor.
2. Equation valid for values as follows:
3. Uses a 2:l safely factor.
4. Uses a 1.51 safely factor.