Pressure/Temperature Relationship

时间：2016-07-09 10:38:22点击：次

Maximum Operating Pressure - PSI (Water @ 7°F)

1. Threading Schedule 40 and SDR/PR pipe  is not recommended.
2. Threading Schedule 80 pipe above 4"  is not recommended.
3. CPVC  threaded connections should be avoided when possible at elevated  temperatures and pressures. (Consult Hydroseal)
4. The operating pressures  listed above are based on the hydrostatic design of the product using water as a test medium at 73ºF.
Maximum Operating Pressure - PSI (Water @ 7°F)


The working pressure of PVC and CPVC pipe is directly affected by  temperature changes. When  the operating temperature of  the pipe  increases,  the pipe  loses  its
stiffness and  tensile strength decreases. A drop  in pressure capacity results. The drop can be calculated using  this chart. Multiply  the pipe's maximum working pressure by  the  temperature correction  factor  for a known temperature.Example: For 2" Schedule 80 PVC pipe, the maximum working  pressure  is  400 PSI .   I f   the  operat ing temperature is known to be 110ºF, the correction factor can be  found on  the chart  to be 0.50. The adjusted pressure would then be 400 x 0.50 = 200 PSI.

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