Where are allowable stress values for piping materials obtained from?

Where are allowable stress values for piping materials obtained from?

• A. ASME material stress tables (Appendix A)
• B. ASME B31.3 Materials Guide
• C. ASME Sec VIII Pressure Vessel Code
• D. ASME B16.5 Piping Fittings

Answer: (A)

Allowable stress values are the maximum stresses considered permissible in a material for design, and they depend on the specific material and temperature. The standard source for these numbers is the ASME material stress tables, which compile the allowable stresses for each material across the relevant temperature range. Designers look up the material and temperature in these tables to determine the allowable stress to use in strength checks and thickness calculations. Other options don’t provide the actual formal values: the B31.3 Materials Guide is a reference that directs you to the official data but does not itself contain the allowable stresses. The vessel code (Section VIII) covers different rules for pressure vessels, not the piping material allowable stresses. And B16.5 covers piping fittings, not the material properties themselves. Therefore, the correct source is the ASME material stress tables.

Allowable stress values are the maximum stresses considered permissible in a material for design, and they depend on the specific material and temperature. The standard source for these numbers is the ASME material stress tables, which compile the allowable stresses for each material across the relevant temperature range. Designers look up the material and temperature in these tables to determine the allowable stress to use in strength checks and thickness calculations.

Other options don’t provide the actual formal values: the B31.3 Materials Guide is a reference that directs you to the official data but does not itself contain the allowable stresses. The vessel code (Section VIII) covers different rules for pressure vessels, not the piping material allowable stresses. And B16.5 covers piping fittings, not the material properties themselves. Therefore, the correct source is the ASME material stress tables.