The Imperial War Museum, which is responsible for HMS Belfast, wanted a fire detection system that was simple, reliable and easy to maintain. They also wanted a system that could be installed in phases without compromising protection levels.

Firetecnics Systems therefore specified the system based around Apollo's XP95 range of detectors, which feature the XPERT patented addressing system that makes detecting heads simple to install and easy to maintain. The purely mechanical device consists of a coded plastic card that fits into the base. Setting the address simply involves the removal of 'pips' from the card using a screwdriver. The coded card is then inserted into the base where it locks into position.

The remaining pips on the card operate the address buttons on the bottom of the detector head when it is rotated into the base.

Because the XPERT card is purely mechanical it is not susceptible to damage and power failure during installation and commissioning. With address information held in the base, detecting heads can be swapped to meet changes in use or replaced for maintenance reasons without the need for any reprogramming. Extending the fire detection system later is equally simple as XP95 is based on a digital open protocol, ensuring backwards and forwards compatibility as well as making upgrades logistically easier.

The layout of HMS Belfast is complex and quite cramped, with exhibits and other facilities arranged over nine decks. In addition to its role as a museum, it also hosts talks, workshops, conferences, team building exercises and educational activities. One highlight for school children is the 'Kip on a Ship' initiative, which allows groups of up to 50 youngsters to stay on the ship for up to three nights sleeping in real sailors' bunks. The children are part of a broad age range visiting the ship, all of whom are placed in unfamiliar surroundings. These factors needed to be considered when modernising and replacing the fire detection system.

Installation of the system was technically challenging because headroom is restricted and the ceilings are congested with a lot of cabling already. Firetecnics Systems had to consider the effect that an alarm signal would have in such a confined space. While the need to alert occupants to a fire hazard is paramount, the sound can be artificially amplified below decks so Firetecnics Systems included loop sounders in the internal areas to ensure that the alarm level would not become excessive. As an added precaution, Firetecnics installed a voice evacuation system in the sleeping accommodation that is designated for the children on residential courses. In addition to raising an alarm, the system will use spoken instructions to guide youngsters to safety in the event of an emergency.

MJ Information No: 18212