Transnet Pipelines, a subsidiary of Transnet, is the principal operator of South Africa's fuel pipeline system. It is responsible for over 3,000 kilometres (1,900 miles) of pipelines. It is responsible for petroleum storage and pipeline maintenance. Transnet Pipelines works with petrols, diesel fuel, jet fuel, crude oil and natural gas. Total throughput is over 16 billion litres (3.5 billion imperial gallons; 4.2 billion US gallons) per year.