Corrugated stainless steel piping systems for indoor gas installations

This approval requirement relates to plastic-coated flexible and pliable corrugated stainless-steel pipes and matching tensile resistant fittings for gas installations in residences and buildings for the transport of gaseous fuels of the 1st, 2nd and 3rd family of gasses according to EN 437. The products are provided in the diameter range of DN 10 up to and including DN 50. The maximum admissible operating pressure is 2 bar for DN 10 to DN 25 (Class 2), the maximum admissible operating pressure is 0.5 bar for DN 10 to DN 50 (Class 1). The system is intended for indoor use at operating temperatures ranging from -20 °C to 60 °C.