ASME B31.3 Process Piping - Reactions

ASME B31.3 Process Piping - Reactions

• General Considerations
• Fabricated Equipment
• Rotating Equipment
• Supports
• Cold Spring

General Considerations

• Main purpose is to provide sufficient support and flexibility to prevent the piping from exerting excessive reactions on equipment and restraints
• The calculation methods are different for fabricated equipment than for rotating equipment or supports
• Reaction limits are determined differently for fabricated equipment than for rotating equipment or supports

Fabricated Equipment

• Calculation Methods
• Reaction Limits
• Nozzle Flexibility

Calculation Methods

• Usually the accuracy of a formal analysis using a computer stress analysis program is required
• Both sustained loads and displacement loads are considered
• Failure modes for fabricated equipment include:

• Gross deformation or collapse

• Fatigue

• In order to evaluate fatigue, the entire range of loads must be considered, so the temperature range for this calculation is the same as for calculating the displacement stress range

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