ASME B31.3 Process Piping - Flexibility and Stress

ASME B31.3 Process Piping - Flexibility and Stress

• General Considerations
• Friction
• Stress Intensification
• Thermal Expansion
• Spring Hangers
• The Displacement Load Analysis

General Considerations

• Main purpose is to provide sufficient flexibility to safely accommodate changes in length resulting from temperature variations, avoiding failure caused by
• Fatigue
• Creep-fatigue
• Ratchet
• Another purpose is to keep movement of piping within a manageable range
• Avoiding interference with other stuff
• Supports designed to handle displacements

General Considerations

• Loads are actions that cause one end of a pipe segment to move relative to the other end and actions that have an equivalent effect
• Thermal expansion of attached equipment
• Temperature changes in the piping
• Peak stresses are accounted for using stress intensification factors
• Acceptance criterion is based on the stress range

Friction

• Displacement causes piping to move over sliding supports
• Friction forces are in one direction when the pipe is heating and in the opposite direction when cooling
• The coefficient of friction used for steel on steel ranges from 0.3 to 0.5.

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