# 1985 York
Hot water pipes made of cross linked polyethylene have been studied at Studsvik Energiteknik A6 since 1973. The work has mainly been concentrated to studying different evaluation and extrapolation methods. The results show that today the best method of lifetime extrapolation for hot water pipes is based upon long-term pressure testing at elevated temperature, in which the external testing environment is taken into consideration. The suitability of rapid evaluation methods like thermal analyses is limited. For the best of the cross linked polyethylene grades studied, a service life of 50 years can be expected at a continuous temperature of up to 85 to 90'~.
Author(s) : Eriksson, Ifwarson
Since 1978 STUDSVIK has been testing a PEMoD-grade from Unifos Kemi AB for applications in the temperature range 30 - 60 C. The aim has been to study the long term properties of the material and thus to enable its life to be determined. Pressure testing has show; that the material is expected to last for 50 years at...