Trench Effect News Today

But at a 30-degree angle, the angle of the kings cross escalator, the flames leaned into the shaft at an angle and raced upwards. in the confined trench, the fire could only draw air from below, creating a draft. >> because the air cant come round the fire, it has to come effectively through the fire. >> investigators then ran a bigger test on a one-third sized model of the complete kings cross station. if the trench effect worked this time, it would prove their theory was right. >> in a matter ...

Extinguished. >> the fireman who was walking down escalator number 6 and looked across to escalator number 4, approximately one minute before flashover, had described the fire as being relatively small. >> but then, the fire spread across the steps, the bottom of the trench. it could only draw oxygen from one direction, from below. this was the trench effect. >> the flames were deflected into the trench and began to flow up the treads, the risers, and exposing the balustrades to very high levels...

Stages as well, which would start this effect off of the trench effect. >> the escalator trench acted as a chimney, made not of brick, but of highly flammable wood. at 7:45, a torrent of superheated gas rushed up the escalator, priming everything in its path to burn. >> the sudden movement of the fire up the escalator was called the flashover. it burst into the booking hall at the top. >> the hot gases and flames exploded into the ticket hall, feeding off years of thick paint on the walls and 3 ...

Front, and, therefore, once it gets going, it could move very, very rapidly. >> they called what they saw the trench effect. but it was merely a theory using untested computer simulations, and it was inconsistent with typical fire behavior. >> if you have a fire burning in the open, on a flat surface, the fire feeds itself with air by drawing it in from the outside. its created by the dynamics of the flame itself. the buoyant gases rise, creating slight pressure differences, which draw air in at...

Stages as well, which would start this effect off of the trench effect. >> the escalator trench acted as a chimney, made not of brick, but of highly flammable wood. at 7:45, a torrent of superheated gas rushed up the escalator, priming everything in its path to burn. >> the sudden movement of the fire up the escalator was called the flashover. it burst into the booking hall at the top. >> the hot gases and flames exploded into the ticket hall, feeding off years of thick paint on the walls and 3 ...

Into the shaft at an angle and raced upwards. in the confined trench, the fire could only draw air from below, creating a draft. >> because the air cant come round the fire, it has to come effectively through the fire. >> investigators then ran a bigger test on a one-third sized model of the complete kings cross station. if the trench effect worked this time, it would prove their theory was right. >> in three or four seconds the flames were from upright, then lying along the escalator trench. fr...

>> the escalator trench acted as a chimney, made not of brick, but of highly flammable wood. at 7:45, a torrent of superheated gas rushed up the escalator, priming everything in its path to burn. >> the sudden movement of the fire up the escalator was called the flashover. it burst into the booking hall at the top. >> the hot gases and flames exploded into the ticket hall, feeding off years of thick paint on the walls and three tons of varnished wood on the escalator below. the cavernous room wa...

Number 4 approximately 1 minute before flashover had described the fire as being relatively small. >> but then the fire spread across the steps. the bottom of the trench. it could only draw oxygen from one direction, from below. this was the trench effect. >> the flames were deflected into the trench and began to flow up the treads, the risers, and exposing the balustrades to high levels of heat flux. >> from there, the gases are going up the escalator trench ahead of the flame. theyre heating t...