Businesses involved in transport via pipelines operate networks that move gases and liquids between production sites, processing facilities, storage terminals and customers. This can include natural gas, crude oil, refined petroleum products and industrial chemicals. Operators may manage transmission pipelines over long distances, as well as distribution networks that deliver products to local areas or individual industrial users. Typical services include pipeline operation, flow control, pumping or gas compression, metering and monitoring. Businesses may also inspect and maintain pipes, valves and associated equipment, investigate leaks, and carry out repairs or upgrades. Work can involve monitoring pressure and product quality, managing connections and coordinating safe access to pipeline routes. Some operators provide transport capacity to other organisations, while specialist contractors undertake engineering, inspection and maintenance work on pipeline systems.