Escalator & Elevator Overheat/Fire Protection
AIRPORTS, HOTELS, METRO STATIONS, SHOPPING PRECINCTS, HOSPITALS, MULTI -STOREY CAR PARKS, OFFICE BUILDINGS - ALL are examples of where you would expect to find at least one of the subject risks – ESCALATORS or ELEVATORS / LIFTS
Undetected OVERHEAT conditions that develop into life threatening FIRE situations from escalators and elevators in any or all of the above areas are probably the greatest risk to users and operators. Many consider the frequency of reported fires on escalators either too small to warrant major concern and consideration or reported too infrequently to justify investment in a rapid, maintenance and false alarm free PROTECTION system.
Unfortunately major fire related incidents occur far too regularly. In the words of one recognised poet..."Most discoveries are made regularly every 15 years". Causes are identified, lessons are learnt BUT then in time experienced individuals leave those organisations involved - taking their knowledge with them. Then the organisations forget and before long the conditions become ripe for another accident.
LINEAR HEAT DETECTION - has been repeatedly and successfully employed for many years by leading escalator manufacturers. Manufacturers install the heat sensitive cable in a similar manner to that illustrated below in FIG .1.
Figure 1. - Escalator Protection
Features and benefits that LINEAR HEAT DETECTION can offer this application include LOCAL continuous monitoring and detection of overheat conditions (pre-combustion) at the POINT OF RISK. Detection of abnormal temperature rises within areas of limited access and surveillance, false alarm free operation within adverse environmental conditions, low maintenance or maintenance free operation, alarm point location identification.
ELEVATORS present a totally different risk. With reports suggesting that the primary areas for protection being the machine room (where fitted - FIG.2) or gearless machine and governor areas (fitted to the "new generation" elevators - FIG.3) and the elevator shaft itself. These areas can similarly be effectively protected using the flexible construction of the LINEAR HEAT DETECTION systems "cable and detector combined" feature that is the small guage -approx: 4mm -heat sensor wire/cable.