Huge motors to transform Alexandria’s public health 30 November 2012

Regal is supplying seven enormous motors for a new wastewater pumping station being built in Alexandria, Egypt's second largest city.

Egypt is currently undergoing a massive programme of renewing its water and wastewater infrastructure, to meet the developing needs of its urbanising and industrialising population.

The motors are being supplied in two stages. The first was despatched this summer (2012) and the second is due for shipping imminently.

All of the electric motors are high-voltage, 800 frame units from Regal's 'standard' HAA range, which can be customised to meet project requirements. They are based on a fabricated steel frame and in this case use a 14-pole design.

"Normally, HAAs are conventional, horizontal-shaft motors," says Mark Williams of Regal. "The most obvious customisation for this project is that they are mounted vertically, with the shaft facing downwards and the pump impeller mounted directly to them."

Williams says this requirement led to several mechanical modifications – to bearings, mountings etc, although he adds that, because of the HAA's design, "these were all fairly easy to accommodate".

He also says that, since the motors will be running at relatively low speed and often for extended periods of time, direct forced draught cooling was unlikely to prove adequate.

"We considered air blowers, water jackets and several other ideas, finally going with a driven-air solution that should prove robust and easy to maintain," says Williams.

When the installation is complete, the pumping station will be integrated into the city-wide wastewater network.

Brian Tinham

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