![]() ![]() As with dimensions and pressure capacity, published pipe stiffness figures are applicable only for 73☏ operating temperatures. PVC pipe and conduit becomes stiffer with decreasing temperature and more flexible with increasing temperature. The maximum recommended operating temperature for PVC pressure pipe is 140☏. To reduce the pressure ratings of PVC pressure pipe for operating temperatures above 73☏, multiply the pressure rating or pressure class by the derating factors in Table 2 on the back of this page.įor applications below 73☏, use the published pressure ratings since they will be conservative. The pressure ratings given for PVC pipe are for a 73☏ operating temperature. Pressure Capacity PVC pipe exhibits increasing pressure capacity with decreasing temperature, and decreasing pressure capacity with increasing temperature. ( This rule is independent of pipe size.) Table 1 can also be used to determine the effects of temperature changes on the length of PVC pipe and conduit. A good rule of thumb in design of PVC pipe and conduit systems is to allow 3/8” length variation for every 100 feet of pipe for each 10☏ change in temperature. The coefficient of thermal expansion for PVC is:īecause the length-to-diameter ratios of PVC pipe and conduit products are generally very large, length change from temperature variation is the most noticeable. Like all materials, PVC expands with increasing temperatures and contracts with decreasing temperatures. The following will help to explain how PVC pipe and conduit products are affected by operating temperatures other than 73☏. The published dimensions and performance ratings for PVC pipe and conduit products are usually applicable only for 73☏. Dimensions, pressure capacity, and stiffness are all affected by temperature changes. Polyvinyl Chloride (PVC) is a thermoplastic, and as such, its physical properties change with temperature variations. ![]() In this bulletin we will explore the effects of temperature on PVC pipe.
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