Plastic Pipes Conference Association # 2023 Lake Buena Vista
Norbert Jansen, Andrew Wedgner, Rainer Kloth
PE100+ Association(client) has sponsored a technical investigation to define the permeation rate of hydrogen through polyethylene pipes at an external expert laboratory. Four different types of PE pipe materials in the same pipe size and SDR17 have been evaluated at 3 different target temperatures 8°C, 14°C and 20°C, at one target pressure level of 6,3barg and exposed to 100% hydrogen. The permeation coefficients of the investigated PE80, PE100 and PE100- RC materials can be summarized in a smaller range per temperature and can be seen as the typical rate for those pressure rated PE pipe materials. As expected, the permeation coefficients show the temperature dependence.
Hydrogen is going to be an important energy source for the future. Existing gas networks and new gas networks need to be compatible to hydrogen and mixes of hydrogen and/or natural gas or biogas. The physical performance and chemical resistance to hydrogen at the common distribution network pressures have been tested for different PE pipes in laboratory and field tests. Several papers at recent Plastic Pipes Conferences (1)(2) have confirmed that the systems made of classified PE80, PE100 and PE100-RC are resistant to hydrogen and there is no physical or chemical degradation observed nor expected. As the hydrogen is a smaller molecule, a higher permeation through different materials is expected compared to natural gas. However, a quantification, helpful for example for the risk assessment of a gas network owner, was partly missing.
Therefore, the PE100+ Association (client) has sponsored a technical investigation (3) to define the permeation rate of hydrogen through polyethylene pipes at an external expert laboratory in Germany.
The investigated materials in pipe form were organized by the client and sufficient amounts of pipe, all with the same pipe size and dimension, were provided to the expert lab. The client focused on materials which are the typical materials used during the last 30-40 years until today and which can be found in many low-pressure natural gas distribution networks made of classified PE pressure pipe materials.
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