Examinations Concerning the Squeeze-Off of Pipes Made of PE 80, PE 100 And PE-Xa [PE]
# 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.
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