Trenchless Installation with Polyamid 12 - the new protection for pipes

Proceedings Publication Date:

01 Aug 2017
Presenter
Markus Hartmann
Presenter
Author
Markus Hartmann
Part of the proceedings of
Abstract
For more than 50 years, Evonik has been operating a fully back-integrated production process for polyamide 12 at the Marl Chemistry Park, starting with butadiene and running through all precursor steps to the polymer. Since then the high-performance plastic has been exposed day-in day-out to extreme environmental conditions, such as high temperatures, extreme weather conditions, and direct contact with hydrocarbons. A large portfolio is available for various industries. For oil and gas applications the so-called VESTAMID® NRG grades offer good resistance to fats and oils, fuels and hydraulic fluids, solvents and even salt solutions. In addition, they feature unusually high impact resistance and toughness even at low temperatures, excellent stress cracking resistance, excellent wear resistance, and a low sliding friction coefficient. Using non-conventional installation technologies all-plastic pipes for gas transport made from VESTAMID® NRG and steel pipes encased with this high-performing polyamide profit from polyamide 12's profile of properties. The following trenchless installation techniques can be used: horizontal directional drilling, soil displacement method with non-steered displacement hammers, dynamic ramming, plow technology. When the product pipes are pulled directly into a previously created drilling channel the strengths of the PA 12 wall or coating become clear: In particular, in pulled-in pipeline systems, stones or obstacles may create point loads or pressure loads that could represent a local hazard for the corrosion protection coatings. PA withstands these loads. Several projects with non-conventional installation of gas distribution pipes without sand bed has been realized in Germany, USA, Brazil and Indonesia in the last years and also encased steel pipes were installed with various trenchless laying technologies without any damage of the coating. This was demonstrated using the cathodic corrosion protection method.

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