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traditional detectors. Even then, there has to be a sufficient build up of smoke concentration to activate the
detector. Aspirating smoke detection systems that draw sampled air into the detector are similarly
challenged in high ceiling height structures as, again, smoke still has to reach the sampling position in the
roof before the alarm is activated.
The inadequacy of these systems in voluminous buildings such as the Royal Airwing Hangar is further
exacerbated by the high ceiling height and the possibility of smoke stratification further delaying the
activation of the conventional detectors at ceiling level. Smoke rises because it is hotter than the surrounding
air and as it travels through the cooler air, it cools down. Once the smoke reaches the same temperature as
the air, which in Dubai can reach as high as 40 degrees C, it stops rising and will not be detected until the
heat generated by the growing fire raises the stratification level. Indeed, the thermal barrier created by the
high ambient temperature air rising to the hangar’s ceiling, creating a hot air (thermal) barrier, will only make
early detection by traditional detectors less likely.
Another consideration that encouraged the hangar’s consultants and fire officers to seek a faster and more
reliable solution was the fact that the hangar’s huge doors would be open for most of the time. This means
that there would be no reliable predictable airflow route, leading them to the conclusion that the only
dependable solution was to seek an “at source” detection system. A visit to a D-Tec protected British
Airway’s hangar at Heathrow Airport in London persuaded them that the best solution was the D-Tec’s FMapproved
Video Smoke Detection system, VSD.
In the words of the British Airways Fire Protection Manager, John O'Sullivan (MBE), 'The D-Tec system
showed itself to be the best for our particular needs with a proven track record and very low maintenance
requirements'.
Royal Airwing Hangar Solution
The solution for the Royal Airwing Hangar was devised by BSS-ME in Dubai, working closely with colleagues
from D-Tec engineers in the UK. The VSD equipment was supplied to Honeywell, which provided the CCTV
equipment. The installation was carried out by BK Gulf’s BCL Fire Systems division, part of the Dutco
Balfour Beatty Group.
It comprised a combination of infrared flame detection
and D-Tec’s VSD system. The flame detectors are
fitted below wing height, while the VSD CCTV cameras
are installed around the perimeter of the hangar, 15
metres above floor level, just above the planes’ wing
height. This ensures that the VSD system will detect
smoke escaping from any aircraft doors or appearing
above wing level from a fire lower down. VSD
provides the early warning detection of smoke to allow
manual activation of the foam suppression
extinguishing systems’, if required. However the VSD
and flame detection systems are linked together so
that, should both systems detect smoke and flame, the
alarm is triggered and the hangar’s suppression
extinguishing systems’ are automatically activated.
Eight CCTV cameras are used to protect each of the eight areas of the hangar, resulting in a total of 64
he two VSD 48U rack-mounted units are located in a central manned control room. Each rack consists of
SS-ME Airport Expertise
he Royal Airwing Hangar in Dubai is not the first D-Tec VSD installation designed and completed by BSSike
the Royal Airwing Hangar in Dubai, the Royal Hangar at Seeb International Airport was built to house
or further information on installations in the Middle East please contact;
Mr Malcolm Gatenby
+971 (0)50 65 22 860
:
cameras. Each eight-camera area is individually wired to one VSD 8 unit, and four areas – or 32 cameras –
are connected to one of two 48U rack-mounted systems. Each camera has a 40-degree field-of-view and is
located no further than 60 metres from the furthest detection point.
T
an integral monitor, keyboard and mouse.
B
T
ME in a major Middle East airport. An installation was recently completed at Oman’s Royal Hangar at Seeb
International Airport. Here too the airport authority had originally planned to install flame and linear heat
cables in the 210-metre by 110-metre by 27-metre high hangar. That was until, in 20 tests, the VSD system
detected smoke that appeared above the planes’ wings within 90 seconds, proving that it does not wait for
smoke to rise to the roof.
L
the A380 Airbus and the Boeing 747. It too was designed to have no internal support columns. BSS-ME
case study for Seeb can be found on their website http://bssme.com/case.htm
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航空翻译 www.aviation.cn
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