Determining Separator Pressure Vessels Wall Thickness

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The following formulas are used in the ASME Code Section VIII, Division 1 for determining wall thickness:
Wall thickness—cylindrical shells

 Determining Separator Pressure Vessels Wall Thickness

 Determining Separator Pressure Vessels Wall Thickness

 Determining Separator Pressure Vessels Wall Thickness

Figure 12-1 defines the various types of heads. Most production facility vessels use ellipsoidal heads because they are readily available, normally less expensive, and take up less room than hemispherical heads. Cone-bottorn vertical vessels are sometimes used where solids are anticipated to be a problem. Most cones have either a 90° apex (a = 45°) or a 60° apex (a = 30°). These are referred to respectively as a “45°” or “60°” cone because of the angle each makes with the horizontal. Equation 12-4 is for the thickness of a conical head that contains pressure. Some operators use internal cones within vertical vessels with standard ellipsoidal heads as shown in Figure 12-2. The ellipsoidal heads contain the pressure, and thus the internal cone can be made of very thin steel.

 Determining Separator Pressure Vessels Wall Thickness

 Determining Separator Pressure Vessels Wall Thickness

Table 12-4 lists joint efficiencies that should be used in Equations 12-1 to 12-4. This is Table UW-12 in the ASME Code. Table 12-5 lists some of the common material types used to construct pressure vessels. Individual operating companies have their own standards, which differ from those listed in this table.

 Determining Separator Pressure Vessels Wall Thickness

 Determining Separator Pressure Vessels Wall Thickness

 Determining Separator Pressure Vessels Wall Thickness

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