The rigorous and extensive testing programme they undertake in their UKAS laboratory, under our ongoing surveillance, tests the cables to British and international standards for key safety criteria including vertical flame propagation
, constructional compliance, insulation resistance, tensile & elongation, heat shock, and RoHS compliance.
The cables that prevent flame propagation
are tested without power supply, while the flame resistant or fire survival cables operate in normal conditions transferring power or signals are tested under mechanical impact, water and flame all the time.
During combustion, the variation in the flame area is closely interrelated to the flame propagation
Lin Baiquan, professor of China University of Mining and Technology, had made researches on the influential factors of the shock wave and flame propagation
in the pipeline gas explosion combustion area [17, 18].
Since chemiluminescence occurs in a region close to the reaction zone, the reconstructed 3D chemiluminescence field can reveal important geometrical features such as flame propagation
and wrinkling, flame orientation, vortex shedding and breakdown, jet precession and recirculation and local quenching.
"This combination has been carefully crafted to provide high resistance to flame propagation
, without the use of bromine and fluorine chemicals, which are notorious for producing toxic and corrosive fumes when a fire breaks out," clarifies Abou Chedid.
Also, flame propagation
by shadowgraph imaging is used to ensure a stable flame.
This configuration results in the widest flammability limits possible because the buoyancy of the hot gases assists flame propagation
up the tube.
 investigated the characteristics of flame propagation
and gas explosions in a 1.16 [m.sup.3] explosion chamber with two circular quartz glass windows with a diameter of 20 mm.