# 2001 Munich
This paper is about the squeeze-off tests on pipes made of PE 80, PE 100 and PE-Xa of different dimensions. After having squeezed off the pipes to a rate of 0.8 the air and water impermeability of the squeezed point is examined at different pressures and the leakage rates are determined. After reforming the pipe resistance towards long-term hydrostatic pressure is tested. It has been ascertained that up to a pipe wall thickness of approx. 10 mm the pipe materials examined could be squeezed-off sufficiently regarding air and water impermeability. For thicker pipe walls the squeezed-off point is not tight anymore due to the large formation of wrinkles inside the pipe resulting in a lasting damage of the pipe. During the long-term hydrostatic pressure test the pipes squeezed off to a rate of 0.8 and afterwards reformed have all met the standard requirements.
Author(s) : Juergen Wuest, Benjamin Baudrit, Frank Dorbath, Christopher Pommer
A testing apparatus for determining the mechanical properties of electrofusion and heated tool sleeve welded joints with the mechanized linear shear test (LST) was developed. The LST-apparatus allows the recording of the force as a function of the extension / shear length. It has been proved that the linear shear test...
Author(s) : Juergen Wuest, Mirko Wenzel, Andreas Bilsing, Peter Postma, Werner Wessing
Within the scope of a DVGW (German Technical and Scientific Association for Gas and Water) research project the technology of squeezing-off for PE pipes at operating pressures higher than 1 bar and the extension to new materials with higher operating pressures were investigated. For this purpose the tightness of the...
Author(s) : Wuest, Engelsing, Wenzel, Bruell, Geertz, Rudschuck