Pipe threads where pressure-tight joints are not made on the threads - Part 2: Verification by means of limit gauges (ISO 228-2:1987); German version EN ISO 228-2:2003— 20 стр.
Codes of practice for drinking water installations - Part 200: Installation Type A (closed system) - Planning, components, apparatus, materials; DVGW code of practice— 51 стр.
Gas supply - Gas pipework for buildings - Maximum operating pressure less than or equal to 5 bar - Functional recommendations; German version EN 1775:2007— 50 стр.
Gas infrastructure - Pipelines for maximium operating pressure up to and including 16 bar - Part 5: Service lines - Specific functional requirements; German version EN 12007-5:2014— 28 стр.