Pipe Thermal Expansion Calculator

Pipe grows as it warms.

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Formula

ΔL = L × α × ΔT

Example calculation

100 ft copper, 100 °F rise → 1.13 in.

Practical HVAC use

Expansion loops and hanger spacing.

Common mistakes

Ignoring expansion on long hot-water or hydronic runs.

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Calculate hydronic water flow in GPM and L/s from heat load and temperature drop (BTU/h = 500 × GPM × ΔT).

Educational tool. Results are estimates from the stated formulas; always confirm with manufacturer data and the code adopted in your jurisdiction. All calculators