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Plastic materials have a significant expansion coefficient. Piping will have a tendency to expand or contract due to the effect of temperatures that are higher or lower than installation temperature. If it is not blocked, the variation in length L of the piping section will have a value:
Delta L = L x expansion coefficient x delta temperature
In which the expansion coefficient of the PVC is equal to 6.10-5 m/m/°C, which is 0.06 mm/m/°C.
Example: A 500-ml-length section of PVC is laid at a temperature of 10°C.
=> At 20°C, the section will measure 500.3 ml (elongation of 0.30 ml).
=> At 5°C, the section will measure 499.85 ml (shrinkage of 0.15 ml).
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