ASME B31.3 Process Piping - Layout and Support

ASME B31.3 Process Piping - Layout and Support

General Considerations

• Access for operation (valves)
• Access for maintenance of in-line devices

• instrumentation

• Traps

• strainers, etc.

• Avoiding interference with other activities

• Removing heat exchanger bundles

• Clearance for pump maintenance, etc.

• Appearance
• Drainage (slope) requirements
• Pressure drop
• Cost of piping, including maximizing use of existing supports
• Avoiding interference with other piping

• Clearance for application of insulation

• Clearance for piping displacement, etc.

• Provisions for future additions

Support Spacing

Two principal sources:

1. Recognized codes & standards

• ASME B31.1
• MSS SP-69: Pipe Hangers and Supports – Selection and Application

2. Owner or designer calculated values

Usually based on simplifying assumptions

• Combination of pipe material and wall thickness used in the facility that gives the shortest spans
• Contents specific gravity, usually 1.0
• Typical insulation thickness and density
• Person walking on pipe for larger sizes

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