Thermal Expansion Calculator
Calculates pipe length changes due to temperature variations using material coefficients of thermal expansion. Determines expansion loop sizing and anchor forces per ASME B31.3 and B31.8.
Pipeline Parameters
ft
Temperature Change
°F
°F
Constraint Type
Expansion loops or flexible joints may be required for long runs
Results
Thermal Expansion
-
in
Temperature Change-
Expansion Coefficient-
Thermal Stress (Anchored)-
Recommendation-
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Formula
ΔL = α × L × ΔT
ΔL = Change in length
α = Coefficient of thermal expansion
L = Original length
ΔT = Temperature change
Standards & References
ASME B31.3 Process Piping - Thermal Expansion and Flexibility
ASME B31.8 Gas Transmission and Distribution Piping Systems
MSS SP-58 Pipe Hangers and Supports - Materials, Design, and Manufacture
Important Notes
Thermal expansion can cause significant stress if pipe is fully restrained
Expansion loops, offsets, or flexible joints accommodate movement
Carbon steel: α = 6.5 × 10⁻⁶ in/(in·°F)
Long straight runs may require multiple expansion joints
Supports and anchors must be designed for thermal loads