This Draft of Code of Practice C 260 helps to ensure the safety and health protection of persons as well as the technical integrity of pipelines, systems and system components for transporting CO₂ in pipelines made of steel pipes. C 260 Draft Code of Practice specifies requirements for the composition of CO₂ and CO₂ streams. It establishes the framework conditions for the supply, transportation, distribution, storage and operation of systems and appliances and for commercial and industrial applications that are planned, built and operated in accordancewith the DVGW regulations (C series). It forms the basis for development, standardization and testing. This Draft of Code of Practice C 260 describes the characteristics and requirements for the properties of a carbon dioxide stream for transportation in steel pipelines and also contains recommendations and information on the effects of CO₂ streams on the design and operation of CO₂ pipeline transportation systems. CO₂ streams within the meaning of this regulation originate from capture processes and are transported to storage sites or for further utilization. The capture processes are either upstream or downstream of the actual power plant or industrial process. The following sources and emitters may be considered, for example: Power plant processes: Gas-fired power plants Thermal waste treatment Biomass power plants Power plants with integrated gasification Industrial processes: Steel production Biomethane production Cement production Building material production Lime production Chemical industry Glass production Foundries The different sources of CO₂ streams result in different compositions, which in turn have a major influence on the design and operation of CO₂ transport pipelines. In the following, the possible influences and consequences of accompanying substances for transportation in steel pipelines are described in more detail. The behaviour and transport of impurities within CO₂ streams described in this document has, where it is available, been based on experimental or operational experience. Where this experience is not currently available, a conservative figure has been used, based, for instance, on theoretical modelling. Once appropriate experience has been gained it is expected to raise some permissible levels so that unnecessary processing expense can be avoided.