Raising the roof at Hogsmill

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Hogsmill crane lift

A 750 tonne crane has lifted a new roof from its assembly point at Thames Water’s Hogsmill sewage works on to a secondary digester tank.

The 20 tonne roof was built over three weeks at ground level, which minimised working at height – improving safety and reducing construction time.

Hogsmill performance manager Colin Stanley said: “The roof will capture gases as part of the site’s energy recovery programme and eliminate any potential odour coming from the tank. It was really impressive to see it lifted across in one go, and it’s great to take another step towards finishing our £26 million upgrade as part of Thames Water’s ongoing, large investment programme of works.”

Hogsmill sewage works, in Lower Marsh Lane, Surbiton, opened in 1954, and serves 400,000 customers in and around the Kingston and Worcester Park areas.

The stainless steel and galvanised steel roof structure was built in the site’s cake pad, which offered up a flat working area at ground level.

The huge crane was assembled on site and the roof was lifted in one smooth manoeuvre over Hogsmill’s large dewatering building and lowered on top of the new tank, which had previously been open.