Effect of Temperature Change Working Pressure The standard design temperature for HDPE pipes is 20°C and working pressures are usually quoted for this temperature. HDPE pressure pipes function perfectly well below 20°C right down to freezing point and can in fact, withstand higher pressures than those quoted at 20°C. As can be seen from the stress regression lines, the creep rupture strength diminishes with increasing temperature and working pressures must be down-rated if the same factors of safety are to be maintained. www.berliapipes.com www.hdpepipe.co Berlia Pipes- Manufacturers of High class Hdpe Pipes