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Checks for bacteria carried out at Dome


CONTRACTORS INSTALLING the temperature control system at the Millennium Dome have introduced an emergency water monitoring regime following a spate of M&E system failures on building projects across London.

The contractors introduced a system of daily sampling of the Dome's temperature control system water supply after experts traced the problem to a slimy gel formed by the water-borne Pseudomonas bacteria. The gel forms in stagnant water used to pressure test the systems and blocks narrow valves, causing the systems to malfunction.

Specialists claimed that virtually every major building across London is affected by the bacteria. But they are baffled as to why formation of the gel should suddenly have increased over the past two to three years.

Heating & Ventilation Contractors Association technical director John Asprey said: 'One suspicion is that it is something to do with the London Ring Main because it is mainly in that area. It doesn't appear to be anywhere else.'

Thames Water denied this. A spokesman said: 'We have tested the ring main and do not believe it has a problem. It does not provide the right conditions for Pseudomonas formation. Our experience is that it develops in static water at the user end of the water supply chain, for example in the bend of a rarely used sink.'

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