cent of the UK's refinery capacity. Crude oil is transported by sea in tankers to the refinery's marine terminal, which handles around 2,000 ship movements and 22 million tonnes of crude oil and other products every year. The crude oil is pumped into storage tanks before being processed. The crude oil is distilled into different fractions, with other complex processes being performed to produce a full range of products, that includes propane and butane (LPG), petrol, jet fuel, diesel, marine fuels, heating oil, lubricant basestocks and fuel oil. Major process units include three atmospheric and three vacuum distillation units (although one atmospheric and one vacuum distillation unit was shut down in 2012), a fluid catalytic cracking unit, a resid finer, a polymerization plant, two powerformers, six hydrofiners (a new one was brought online in 2013), two sulphur extraction units, a lubricating oil manufacturing complex, an isomerization unit and a bitumen plant (which was shut down in 2009). In addition to this, the refinery is also home to the largest refrigerated LPG storage facility in Northern Europe. About 5% of Fawley's production is distributed by rail or road, 25% by sea and 70% by pipelines. The refinery at Fawley also supplies feedstock to the adjacent chemical plant. Rail facilities at Fawley comprise LPG loading, chlorine facilities, crude offloading, a chemical facilities building, caustic facilities, butyl rubber, bitumen, gas oil and a coal road. The Fawley branch line is connected to the South West Main Line via an east-facing connection to the west of Totton station. Chemical plant The site houses a chemical facility operated by ExxonMobil and Nalco. The ExxonMobil chemical plant produces approximately 750,000 tonnes of chemical products every year. The initial stage for many of the chemical products was the steam cracker (shut and dismantled in 2013), which took a feedstock of heavy naphtha or gas oil from the refinery to produce basic chemical building blocks: ethylene, propene and butene. This plant is now demolished, with Ethylene shipped directly in from a supplier; the propene and butene streams from the petroleum side of the refinery are used as feedstocks, mainly for the higher olefins plant and the isobutylene plant. Butene is stored in seven large pressurised spheres – known as the seven sisters – that are a prominent feature of the Fawley site. The higher olefins plant is the largest chemical plant at Fawley. The 14 higher olefins manufactured