13 ENVIRONMENT. HEALTH PROTECTION. SAFETY 13.060 Water quality 13.060.20 Drinking water 13.120 Domestic safety23 FLUID SYSTEMS AND COMPONENTS FOR GENERAL USE 23.040 Pipeline components and pipelines 23.040.01 Pipeline components and pipelines in general 23.040.10 Iron and steel pipes 23.040.15 Non-ferrous metal pipes 23.040.20 Plastics pipes 23.040.40 Metal fittings 23.040.45 Plastics fittings 23.040.50 Pipes and fittings of other materials 23.040.60 Flanges, couplings and joints 23.040.70 Hoses and hose assemblies 23.040.80 Seals for pipe and hose assemblies 23.040.99 Other pipeline component 23.060 Valves 23.060.01 Valves in general 23.060.10 Globe valves 23.060.20 Ball and plug valves 23.060.30 Gate valves 23.060.40 Pressure regulators 23.060.50 Check valves 23.060.99 Other valves 23.100 Fluid power systems 23.100.40 Piping and couplings 71 CHEMICAL TECHNOLOGY 71.040 Analytical chemistry 71.040.01 Analytical chemistry in general 71.040.10 Chemical laboratories. Laboratory equipment 71.040.20 Laboratory ware and related apparatus 71.040.30 Chemical reagents 71.040.40 Chemical analysis 71.040.50 Physicochemical methods of analysis 71.040.99 Other standards related to analytical chemistry 91 CONSTRUCTION MATERIALS AND BUILDING 91.140 Installations in buildings 91.140.60 Water supply systems |