Hamworthy plc acts as a holding company. The Company is engaged in the designing, manufacturing and supplying of products and systems for marine and oil and gas related industries. The Company operates in four segments: the Pump Systems Division designs and manufactures a range of cargo and general duty pumps and pump systems; the Oil & Gas Systems Division�s designs and supplies systems, which handle the phase change of petroleum products and natural gas cargos between vapor and liquid; the Water Systems Division provides solutions for the onboard treatment of liquid waste products, the generation of fresh water through desalination plant and the treatment of ballast water; and 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. In October 2011, the Company acquired AW Flow Holdings Limited. In January 2012, Wartsila Oyj Abp acquired the Company.