ASME B31.3 Process Piping - Fine Tune Piping Material Decisions

Materials

• Strength of Materials
• Bases for Design Stresses
• B31.3 Material Requirements

• Listed and Unlisted Materials

• Temperature Limits

• Toughness Requirements

• Deterioration in Service 

The Material in This Section is Addressed by B31.3 in:

• Chapter II - Design
• Chapter III - Materials
• Appendix A - Allowable Stresses & Quality
• Factors – Metals
• Appendix F - Precautionary Considerations

Strength of Materials

• Stress
• Strain
• Stress-Strain Diagram

• Elastic Modulus

• Yield Strength

• Ultimate Strength

• Creep
• Fatigue
• Brittle versus Ductile Behavior

Fatigue failure: A failure which results from a repetitive load lower than that required to cause failure on a single application

Bases for Design Stresses

Most Materials – (materials other than gray iron, malleable iron and bolting) below the creep range, the lowest of (302.3.2)

• 1/3 of specified minimum tensile strength (ST)
• 1/3 of tensile strength at temperature
• 2/3 of specified minimum yield strength (SY)
• 2/3 of yield strength at temperature; except for austenitic stainless steels and nickel alloys with similar behavior, 90% of yield strength at temperature

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