Honeywell ensures hot-water safety for new aircraft carrier
Honeywell water control valves are being installed on the Royal Navy’s new aircraft carrier HMS Queen Elizabeth to automatically control water pressure at all domestic-water outlets and prevent excessively hot water in baths, showers and wash basins. Marine-engineering valve specialist Score Marine is installing 50 Kombi 4 throttle valves for the automatic balancing of DHW and 142 TM200VP thermostatic mixing valves on the ship. This is the largest ship ever built for the Royal Navy and will weigh 65 000 t and be 280 m long.
Domestic hot water will be stored at at least 60°C to avoid legionella and distributed at at least 50°C. To prevent scalding, the TM200VP fail-safe mixing valves are being installed at outlets.
The Kombi 4 throttle valves have a thermal disinfection feature to periodically flush the system with water at over 70°C, opening fully to ensure hot water is rapidly distributed in all risers and pipelines. These valves then return automatically to the usual control state when the water temperature falls to normal.
