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Grenfell Tower had the wrong pipes for firefighters to use, meaning they couldn't put out the flames on the building's top floor, an inquiry has heard today.
Dr Barbara Lane, a chartered fire safety engineer, said Grenfell had dry mains, which are pipes through which the fire service have to pump their own water through from their engines.
The pipes lose effectiveness the higher they operate.
Buildings that are 50 metres or more in height are required to have wet mains, where water is brought from a pressurised tank already within the building.
Grenfell - Metres - Height - Mains - Dr
Grenfell is 67.3 metres in height and had dry mains, Dr Lane's expert report said.
Speaking at the inquiry at Holborn Bars, the director at the specialist design group Arup set out the statutory background to fire safety in high-rise buildings.
Dr - Lane - Probe - Witnesses - Mains
Dr Lane, who is one of the probe's expert witnesses, said dry mains are located on each floor and rely on good water pressure to work against gravity.
She said: 'Eventually a height is reached where the water pressure that can be delivered by a dry main cannot effectively operate a fire hose.'
Fire - Grenfell - Tower - Floors
The fire at Grenfell Tower was most devastating on the upper floors.
The expert continued: 'For this reason, the statutory design guidance limits use of dry mains to buildings less than 50 metres in height.'
Dr - Lane - Evidence - Refurbishment - Tower
Dr Lane also said that there is 'no evidence' that those involved in the refurbishment of the tower tried to find an 'alternative approach' to comply with building regulations.
Approved Document B of the building regulations lays down measures...
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