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Separator Design 271
Figure 6.1 Ellipsoidal and torispherical vessel heads.
Table 6.2 Wall-Thickness Rounding Increments for Pressure Vessels
Wall Hounding 3
13
Thickness, in Increment , in
<1.0 1/32
> 1.0 < 2.0 1/16
> 2.0 < 3.0 1/8
>3.0 1/4
a) Because alloy steels and nonferrous metals are more costly
than carbon steel, the rounding increment should be smaller
than the above.
b) To convert to mm multiply by 25.4.
Minimum Vessel Thickness for Pressure Vessels
Metal Service Minimum
Thickness, in
Carbon and low-alloy noncorrosive 3/32
steels
High-alloy steels noncorrosive 1/16
and nonferrous metals
High-alloy steels corrosive 3/32
and nonferrous metals
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