District heating pipes - Preinsulated bonded pipe systems for directly buried hot water networks - Joint assembly for steel service pipes, polyurethane thermal insulation and outer casing of polyethylene; German version EN 489:2003— 25 стр.
Non-destructive testing of welded joints in thermoplastics semi-finished products - Part 3: Ultrasonic testing; German version EN 13100-3:2004— 18 стр.
Gas infrastructure - Gas installation pipework with an operating pressure greater than 0,5 bar for industrial installations and greater than 5 bar for industrial and non-industrial installations - Part 1: Detailed functional requirements for design, materials, construction, inspection and testing