For Industrial and Institutional Corrosive Fume Exhaust and Drain Applications

THERMAL EXPANSION AND CONTRACTION

The coefficient of linear expansion (y) for Harvel PVC Duct is 2.9 x 10-5 in/in/°F. As with all piping products, thermal expansion and contraction of the system must be considered and properly addressed during the design and installation of the system. The expansion or contraction rate of Harvel PVC Duct can be calculated as follows:

The most common means to compensate for changes in length is with the installation of in-line expansion joints, either flexible sleeve type or o-ring piston type being the most common. The effects of thermal expansion and contraction can also be compensated by using the inherent line flexibility of the system to construct expansion loops and offsets where required. Additional detailed information concerning the effects and control of thermal expansion and contraction, and other information pertaining to the design and installation of PVC piping products, is available from Harvel Plastics, Inc.

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