This document specifies requirements and gives recommendations for the design, materials, construction, testing, operation, maintenance and abandonment of pipeline systems used for transportation in the petroleum and natural gas industries. It applies to pipeline systems on-land and offshore, connecting wells, production plants, process plants, refineries and storage facilities, including any section of a pipeline constructed within the boundaries of such facilities for the purpose of its connection. On-land supply systems used by the European gas supply industry from the input of gas into the on-land transmission network up to the inlet connection of gas appliances are excluded from the scope of this document. The extent of pipeline systems covered by this document is illustrated in Figure 1. This document applies to rigid, metallic pipelines. It is not applicable for flexible pipelines or those constructed from other materials, such as glass-reinforced plastics. This document is applicable to all new pipeline systems and can be applied to modifications made to existing ones. It is not intended that it applies retroactively to existing pipeline systems. It describes the functional requirements of pipeline systems and provides a basis for their safe design, construction, testing, operation, maintenance and abandonment. Key 1 wellsite 7 tankage 2 gathering station, treatment plant or process plant 8 refinery 3 liquid 9 depot 4 gas 10 distribution 5 pump station 11 compressor station 6 valve station 12 pressure-reduction station pipeline elements covered by this document connections with other facilities (the pipeline system should include an isolation valve at connections with other facilities and at branches) pipeline elements not covered by this document station/plant area covered by this document Figure 1 - Extent of pipeline systems covered by this document