Honeywell ensures hot-water safety for new aircraft carrier

Honeywell, DHW, scalding, TMV, thermostatic mixing valve
One of the Royal Navy’s new aircraft carriers HMS Queen Elizabeth (front) makes extensive use of Honeywell valves to ensure the safe use of domestic hot water.

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.

For more information on this story, click here: May 2011, 123
Related links:
Related articles:



modbs tv logo

More refrigerant bans possible, says government

The government could tighten up the rules that restrict the use of global warming refrigerant gases including speeding up phase-out programmes and introducing new bans, according to a spokesman from the Department for Environment, Food and Rural Affairs (DEFRA).

Baxi research suggests schools strongly support heat decarbonisation

A survey conducted by Baxi of 200 state school estates managers, consultant engineers and M&E contractors has found that while enthusiasm for Net Zero and support for low carbon heating systems in schools is thriving, persistent barriers remain.