The Engineering ToolBox Web Google

Thermoplastic Pipes - Temperature and Strength Derating

Increased temperature derates the strength of thermoplastic piping materials

Sponsored Links

Thermoplastic materials loose their strength to pressure and tension with increasing temperature. The table below can be used as a guide to common thermoplastics and their derated strength with temperature. Manufacturing data should always be consulted.

Derating Factor
Temperature PVDF CPVC PVC PB PEX PE
(oC) (oF)
21 70 1.0 1.0 1.0 1.0 1.0 1.0
27 80 0.9 1.0 0.9 1.0 0.9 0.9
32 90 0.9 0.9 0.8 0.9 0.9 0.9
38 100 0.8 0.8 0.6 0.9 0.9 0.8
43 110 0.8 0.8 0.5 0.8 0.8 0.8
49 120 0.7 0.7 0.4 0.8 0.8 0.7
54 130 0.7 0.6 0.3 0.7 0.8 0.5
60 140 0.6 0.5 0.2 0.7 0.7 0.4
66 150 0.6 0.5 1) 0.7 0.7 0.2
71 160 0.5 0.4 1) 0.6 0.7 1)
82 180 0.5 0.3 1) 0.5 0.6 1)
93 200 0.4 0.2 1) 0.4 0.5 1)
104 220 0.4 1) 1) 1) 1) 1)
121 250 0.4 1) 1) 1) 1) 1)
138 280 0.3 1) 1) 1) 1) 1)

1) The thermoplastic is not resistant for long term service at this temperature. Operating conditions should be avoided.

Plastic Pipes Temperature Derating Diagram

thermoplastic pipes effect of temperature on strength and stiffnes diagram

thermoplastic pipes effect of temperature on strength and stiffnes diagram

Example - Higher Temperature and Reduced Strength

If operating pressure for a 6" Schedule 80 CPVC pipe is 167 psi, the maximum operating pressure at 150 oF (66 oC) is reduced to

(167 psi) 0.5

    = 83.5 psi

Sponsored Links

Related Topics

  • Material Properties Material properties - density, heat capacity, viscosity and more - for gases, fluids and solids
  • Pressure Ratings Pressure ratings of pipes and tubes and their fittings - carbon steel , stainless steel, plastic, copper and more

Related Documents

Sponsored Links



Engineering ToolBox - SketchUp Edition - Online 3D modeling!

Engineering ToolBox - SketchUp Edition - enabled for use with the amazing, fun and free Google SketchUp.


Search the ToolBox

Google
Web The Engineering ToolBox

© The Engineering ToolBox 2005

9 12 8

handheld Engineering ToolBox - optimized for mobile devices! 3D Engineering ToolBox - draw and model technical applications!


.
Resources, Tools and Basic Information  for Engineering and Design of Technical Applications!

Resources, Tools and Basic Information for Engineering and Design of Technical Applications!