Page 271 - Pressure Vessel Design Manual
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Special Designs 249
Table 4-20
Coefficient Cf per ASME STS-1
UD Exposure Category b a
Surface
Texture 1 7 25 A 0.64 0.333
D(qz)O > 2.5 Smooth 0.5 0.6 0.7 B 0.84 0.25
Rough 0.7 0.8 0.9 C 1 0.15
Very rough 0.8 1 1.2 D 1.07 0.1 11
D(q,)O > 2.5 All 0.7 0.8 1.2
L-
a
c,
E
0
ii
Fundamental Period, T, Seconds
Figure 4-22. Graph of critical wind velocity, V,.
