PEX Pipe Expansion Calculator
Thermal movement of a pex pipe run and the expansion-loop size it needs.
The champion mover (≈1.5 mm/m·10 °C) — but so flexible it absorbs its own growth if snaked.
Formula
PEX Pipe Expansion Calculator is a free pex pipe expansion for design engineers, metallurgists and QA inspectors — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About PEX Pipe Expansion Calculator
Thermal movement of a pex pipe run and the expansion-loop size it needs. The calculation implements ΔL = L×150×ΔT/1000; loop leg ≈ C·√(ΔL·D) (Pipe-maker expansion tables; ASME B31 flexibility). The champion mover (≈1.5 mm/m·10 °C) — but so flexible it absorbs its own growth if snaked.
How to use PEX Pipe Expansion Calculator
- 1Enter Pipe run length in m.
- 2Enter Installation temperature in °C.
- 3Enter Operating temperature in °C.
- 4Enter Pipe OD (for loop sizing) in mm.
- 5Read Expansion, U-loop leg length needed instantly — no submit button needed.
- 6Need US units? Flip the SI/Imperial toggle and every field converts.
Why use PEX Pipe Expansion Calculator?
- ✓Implements the standard formula — ΔL = L×150×ΔT/1000; loop leg ≈ C·√(ΔL·D)
- ✓Reference cited on-page: Pipe-maker expansion tables; ASME B31 flexibility
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the PEX Pipe Expansion Calculator use?+
It computes ΔL = L×150×ΔT/1000; loop leg ≈ C·√(ΔL·D), per Pipe-maker expansion tables; ASME B31 flexibility. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
The champion mover (≈1.5 mm/m·10 °C) — but so flexible it absorbs its own growth if snaked.
Where do the material property defaults come from?+
Defaults are standard handbook values (ASM, manufacturer datasheets, the cited standard). Always substitute certified values from your material's test certificate for critical work.
Is the PEX Pipe Expansion Calculator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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