Chalwyn air shut-off (ASO) valves and exhaust spark arrestors have been fitted on the maintenance vehicles working at the new Milford Haven South Hook LNG terminal in the UK. More than 20 D Series valves and spark arrestors were recently retrofitted by Greens Motors to the various models of commercial vehicles (typically 2.5 litre) as part of the project being run by South Hook LNG terminal. Chalwyn D Series valves provide fully automatic engine over-speed protection with no requirement for mechanical or electrical connections. Different size ranges have allowed meeting application requirements for virtually all popular intake pipe sizes and engine ratings. Chalwyn stainless-steel diesel-engine spark arrestors are approved to EU ATEX standards and are of the quenching type to provide essential safety wherever a stray spark may cause ignition of combustible material. Glowing particles emitted from a diesel engine exhaust are repeatedly impacted against internal spark arrestor surfaces to be cooled and broken down before eventual discharge to the atmosphere. A fleet of double-hulled ships will bring the LNG from Ras Laffan, Qatar, to its safe anchorage, where a regasification plant will convert it from a liquid back to a gas for delivery across the UK via the national grid.