Design of Pressure Vessel using COMPRESS – Various ASME Material Standards for Different Steels

A: In COMPRESS, common ASME material standards for steel include SA-516 (carbon steel plates for moderate and lower temperature service), SA-387 (alloy steel plates for high temperature service), SA-240 (stainless steel plates), and SA-588 (high-strength low-alloy steels). These standards specify properties such as tensile strength, yield strength, and allowable stresses, which are essential for accurate design calculations. The ASME Boiler and Pressure Vessel Code Section II Part D provides comprehensive information on material specifications: https://www.asme.org/codes-standards.

A: COMPRESS integrates ASME Section VIII Division 1 and Division 2 code requirements into its calculation algorithms. It verifies vessel thickness, evaluates stress levels under internal and external pressures, checks for buckling and fatigue, and assesses nozzle loads according to the code’s design rules. The software automatically applies safety factors and considers corrosion allowances as prescribed by ASME standards, providing detailed reports that document compliance. For more on ASME Section VIII, refer to https://www.asme.org/codes-standards/find-codes-standards.

A: Yes, COMPRESS allows the user to assign different ASME material specifications, including various steel grades, to different components or sections within a single pressure vessel model. This capability is important for optimizing design, cost, and performance, especially when different parts of a vessel operate under varying pressures or temperatures. Each material’s mechanical properties are considered independently to accurately assess stresses and thickness requirements.

A: When selecting steel materials per ASME standards in COMPRESS, factors to consider include: operating temperature and pressure conditions, corrosion resistance requirements, mechanical properties like tensile and yield strength, weldability, toughness at low temperatures, and cost-effectiveness. The specific ASME specification chosen must also align with the intended service conditions and any applicable regulatory requirements. Additional guidance can be found in the ASME Boiler and Pressure Vessel Code, Section II, Part D.

A: COMPRESS uses the material properties defined by the selected ASME standard to calculate allowable stresses, minimum thicknesses, and safety factors for the pressure vessel. Yield strength and tensile strength are key inputs for determining the vessel's maximum stress capacity and evaluating failure modes such as yielding or rupture. The software references tabulated material values from the ASME code, ensuring that design calculations meet code compliance and safety requirements.

A: Yes, COMPRESS supports the inclusion of corrosion allowances in thickness calculations. Users can specify a corrosion allowance value that is added to the calculated minimum required thickness to account for expected material loss over the vessel's service life. This feature ensures the vessel maintains structural integrity despite corrosion. The corrosion allowance is typically defined based on operational experience, environmental conditions, and material susceptibility.

A: ASME material standards are typically reviewed and updated every few years to incorporate new research, technological advances, and industry feedback. It is important for designers to use the latest standards to ensure safety and compliance. COMPRESS regularly updates its material databases and code implementations to reflect the most recent ASME standards, but users should verify they are using the latest software version or material libraries. For updates, checking the ASME official site and software vendor notifications is recommended.