Pipeline Thermal Growth & Stress Analysis
ΔT is difference from installation temp, not ambient
Anchored pipes develop full thermal stress; guided pipes allow axial movement
Enter for anchor force and expansion loop calculations
Comprehensive coverage of linear and volumetric expansion, expansion coefficients, thermal stress analysis, and expansion loop design per ASME B31.
Pipeline thermal expansion is calculated as ΔL = α × L × ΔT, where α is the coefficient of thermal expansion, L is the pipe length, and ΔT is the temperature change. Carbon steel has an α of approximately 6.5 × 10⁻⁶ per °F.
ASME B31.3 (process piping) and ASME B31.8 (gas transmission) govern thermal expansion design. The calculator determines pipe growth, thermal stress in restrained pipe, and anchor forces needed to resist expansion.
Unrestrained pipe freely expands and contracts with temperature changes, requiring expansion loops or joints. Restrained (buried) pipe develops compressive thermal stress proportional to E × α × ΔT, which must be combined with pressure stress and checked against allowable limits.