Figure 400-4 gives equations for various components under internal pressure. Internal or external pressure produces a longitudinal-seam stress that is two times larger than that…

The purpose of hydrostatic testing is to reveal defects in the vessel workmanship and to detect the presence of leaks. Note that most weld defects…

See Section 600 for specific recommendations where service environments warrant postweld heat treatment (PWHT). PWHT is performed to reduce residual stresses, hold dimensional tolerances, improve…

Wet H2S cracking can occur at carbon steel equipment exposed to aqueous or “wet H2S” service. Wet H2S is defined as service conditions of at…

Design for brittle fracture is covered in detail in Section 500. At low temperatures, strength is less a consideration than the increasing susceptibility to brittle…

Code rules establish minimum construction standards for a pressure vessel. Because of the extremely wide scope of Section VIII, Division 1, however, higher quality standards…

It is important to understand that Code rules are formulated to provide minimum requirements for safety and service, and that the Code holds the owner/user…

Figure 400-3 shows the design pressure and design temperature range through which the ASME Code, Section VIII, Division 1, applies. Design codes outside of this…

Frequently it is difficult to decide if a unit being incorporated into a piping system should be classed as piping or as a pressure vessel.…

Pressure vessels normally contain various internal components that are attached directly to a vessel’s shell, such as distributor trays, catalyst support grids, baffles, and demister…