The Jazan Economic City (JEC) and associated Jazan Refinery Complex Project (JRCP) are 40 km2 of strategic developments by the Saudi government intended to provide economic stimulus to Jazan Province, through large scale business, industrial, residential and commercial growth. JEC/JRCP are located on the Red Sea Coast, approximately 800 km South of Jeddah, 80 km North of the Yemen border, and approximately 50km North of the existing city of Jazan, where there is a commercial airport and a small commercial port, known as Jazan Port. Saudi Aramco is constructing a grass roots refinery at the JEC and a 2.4GW Integrated Gasification Combined Cycle (IGCC) power station fuelled with heavy residuals off the new refinery. The IGCC will supply power, steam, hydrogen and water to the refinery as well as power to the JEC and national grid. Jazan Gas Projects Company, JGPC, is a Special Purpose Vehicle incorporated in Saudi Arabia to develop a large air separation unit (ASU) to supply nitrogen and oxygen gases to Saudi Aramco. The oxygen will principally be supplied to the new Integrated Gasification Combined Cycle (IGCC) power plant, while the nitrogen will be used both at the IGCC plant and on the refinery, principally for inerting operations. The project is being developed as six parallel ASU trains, with back up liquid storage and vaporisation systems. Each ASU train has a main air compressor (MAC), front-end cooling and purification, booster air compressor (BAC), manifolded heat exchangers cores, distillation columns, product compressor, plus other ancillary equipment. All six ASU trains share the product storage and back-up supply systems. HP GOX, LP GOX and LP GAN are all produced directly off the ASU itself, whereas MP GAN is compressed by a product nitrogen compressor to achieve pipeline pressure. HP GAN is supplied from the back up storage as and when required by Saudi Aramco.