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RAISING THE ROOF

Kvaerner used two giant electric fans to blow into place the roof of a £175 million liquid natural gas tank it is constructing in Dabhol, India. Engineers devised the idea because the 770-tonne roof was too large to lift by crane. Instead, the project team used a pair of2 m-long oval-shaped fans to blow the roof 40 m into position. The operation took seven hours.

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