In-Service Conditions Circumferential stresses from internal pressure usually control the design of cylindrical pressure vessels. However, in tall vertical vessels, five other factors may contribute…
Joint category defines the location of a joint in a vessel and does not define the type of joint. Categories of Joints 1. Longitudinal welds…
The choice of weld design depends on a number of factors including: • The conditions of welding. Accessibility has a definite influence on the type…
After the minimum thickness has been determined, including corrosion allowance, vessels are often brought to the next highest commercial plate thickness. This raises the question…
The ASME Code permits various minimum thicknesses of plate. See Figure 400-12. All vessels, regardless of alloy content, should have a minimum thickness of 3/16…
Blind flanges are covered in Code Paragraph UG-34. The computations determine the thickness required for both operating conditions and gasket seating (Equation UW-34). The more…
The Code covers the design of flanges in (mandatory) Appendix 2. The scope of the rules apply to gaskets contained entirely within the bolt circle.…
The cross-sectional area (A) of reinforcement required for openings in vessels subject to external pressure: where: d = Diameter in the given plane of the…
To determine whether an opening is adequately reinforced, it is first necessary to determine whether the areas of reinforcement available will be sufficient without the…
When an opening is made in a pressure vessel shell or head, the ability of the nearby wall to retain pressure is significantly reduced. Reinforcing…