Hamworthy plc provides specialist systems and services to the marine and oil and gas industries. It operates in four operating divisions. The pump systems division designs and manufactures a range of cargo and general duty pumps and pump systems. The gas systems division’s principal activity is the design and supply of systems which handle the phase change of petroleum products and natural gas cargos between vapour and liquid. The water systems division provides solutions for the on board treatment of liquid waste products, the generation of fresh water through desalination plant and the treatment of ballast water. The inert gas systems division provides products which supply oxygen-depleted air to the ship’s cargo tanks to prevent explosion during the transportation of oil and chemical cargos. On March 9, 2009, it acquired Greenship B.V. In September 2009, it acquired Krystallon Limited. In October 2009, it acquired the Technology and Products division of Aibel AS.