This European standard specifies the requirements for material, design, manufacture, testing, marking and documentation of stainless steel pliable corrugated gas tubing design systems for buildings and for maximum operating pressure 0,5 bar, with a nominal size range from DN 10 to DN 50. This document applies to new installations as well as to replacement of, or extensions to, or modifications to existing systems for 1st, 2nd and 3rd family gases. Stainless steel corrugated gas tubing systems may be used in conjunction with other approved gas piping systems. Note The definitions of 1st, 2nd and 3rd family gases are given in EN 437:2003. This document does not apply to: pliable corrugated tubing without cover; corrugated safety metal hose assemblies for connection to moveable appliances This document does not cover the installation aspects of stainless steel pliable corrugated gas tubing systems which could be subject to local and/or National Regulation involving mandatory strength and tightness pressure tests before commissioning.