# 1992 Eindhoven
The lifetime of plastic pipes has been studied at Studsvik for nearly 20 years. This paper presents results obtained from hydrostatic pressure testing of pipes made from polyethylene, crosslinked polyethylene and polypropylene. Examples of how different factors influence the lifetime of plastic pipes are explained in creep rupture curves. The paper also presents results from computer calculations of the lifetime according to the proposed Standard Extrapolation Method (SEM), ISOIDP 9080.2. A computer programme developed by Studsvik is described in the paper. Experiences from the design of the programme and possibilities and limitations of the SEM are given.