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

Thermoplastic Pipes - Temperature and Strength Derating

Increased temperature derates strength of thermoplastic piping materials

Sponsored Links

Thermoplastic materials loose 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
TemperaturePVDFCPVCPVCPBPEXPE
(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.

  • PVDF - PolyVinylidene Fluoride
  • CPVC - Chlorinated Polyvinyl Chloride
  • PVC - Polyvinyl Chloride
  • PB - Polybutylene
  • PEX - Cross Linked Polyethylene
  • PE - Polyethylene

Plastic Pipes Temperature Derating Diagram

Thermoplastic pipes - temperature and strength and stiffnes diagram

Thermoplastic pipes - temperature and strength and stiffnes diagram

Example - Higher Temperature and Reduced Strength

If the 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

Related Documents

Tag Search

  • en: thermoplastic pipes temperature strength temperature
Sponsored Links

Search the Engineering ToolBox

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse!

Translate this page to
About the Engineering ToolBox!

Citation

This page can be cited as

  • Engineering ToolBox, (2004). Thermoplastic Pipes - Temperature and Strength Derating. [online] Available at: https://www.engineeringtoolbox.com/thermoplastic-pipes-temperature-strength-d_794.html [Accessed Day Mo. Year].

Modify access date.

Customize Ads in the ToolBox

Make ads more useful in Google Ad Settings .

. .

close

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Scientific Online Calculator

Scientific Calculator

10 12

Sponsored Links
.