2014 Chicago : Lifetime Assessment of Polyethylene Pipes in Oil and Gas Infrastructure
Author(s) : P. F. Schoeffl, R.W. Lang
To accommodate the recent industrial interests to utilize PE-HD pipes for oil field applications (e.g. injection water pipes, flow lines), this paper introduces a “fully integrated test concept” to allow a comprehensive pipe lifetime prediction under severe environmental conditions. Moreover, experimental set-ups and...
2004 Milan : Ranking of PE-HD Pipe Grades by Fatigue Crack Growth Performance - 2004
Author(s) : Pinter, Haager, Balika, Lang
In this work fatigue crack growth (FCG) experiments were used to evaluate the long term performance of polyethylene (PE) pipe grades. The FCG-tests were performed under a sinusoidal load at a frequency of 5 Hz, an R-ratio (Fmin/Fmax) of 0.1 and a test temperature of 23 °C. Eight different commercial pipe grades (PE 80...
2001 Munich : Creep and Fatigue Crack Growth in a Pipe Grade PVC Material
Author(s) : Balika, Lang
The creep crack growth (CCG) and the fatigue crack growth (FCG) behaviour of a
commercial pipe grade PVC material was studied based on a linear elastic fracture mechanics
(LEFM) methodology. The FCG tests were performed under sinusoidal load control at a
frequency of 5 Hz and at R-ratios (Fmin/Fmax) of 0.1, 0.3 and...
2001 Munich : Glass Fibre Reinforced Plastics Pipe Systems Produced
Author(s) : Neumayer, Knauder, Pilz, Lang, Major
The importance of plastics piping systems based on glass fibre reinforced unsaturated polyester resins (GRP-UP) for water supply, industrial or sewer pipe works has continuously increased worldwide. Centrifugal casting (CC) is one of the most important technologies to manufacture CC-GRP-UP pipes. UP-resins, mineral...
2001 Munich : The Influence of Local Ageing in Brittle Failure of Thermoplastics Pipes
Author(s) : Pinter, Lang
In this work the influence of three different stabiliser systems on the stress rupture behaviour
of high density polyethylene (PE-HD) pipes under constant internal pressure was examined
at 60 and 80 °C with special consideration of the quasi-brittle failure by growth of a single
crack in the failure regime preceding...
2001 Munich : Viscoelastic Properties of PE for Pipe Applications
Author(s) : Pilz, Lang
To characterize the viscoelastic properties such as creep modulus and time dependent
Poissons’s ratio of commercial medium and high density polyethylene materials (PE-MD,
PE-HD), in total 5 types of polyethylene (PE) (pipe grades and non-pipe grades) with
densities ranging from 0.928 to 0.951 g/cm3 were investigated....
Fracture Mechanics Based Lifetime Prediction of PE Pressure Pipes
Author(s) : R.Lang