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Ensuring efficiency in wet and dry cooling towers

Home Engineering HVAC Ensuring efficiency in wet and dry cooling towers

BMG’s electromechanical team plays an important role in the dependable operation of wet and dry cooling towers in the mining sector, through the supply and support of many power generation components, including Hansen gearboxes.

That’s according to Rob Green, BMG’s National Product Manager – Sumitomo, who said Hansen units, which have been designed by Sumitomo Drive Technologies, in accordance with global Cooling Technology Institute (CTI) specifications, are manufactured especially for wet cooling towers (WCT) and air-cooled condensers (ACC).

“BMG’s Hansen M4 and P4 series are well-known locally for dependable operation and extended service life in arduous conditions. The company is currently introducing the new M5 series to the local market for use in dry and wet cooling towers in mines throughout Africa.”

Hansen P4 right angle vertical shaft up units for wet cooling towers are available in 11 sizes, from Z to H and as 2 stage units in ratios, 3,55/1 to 22,4/1, with ratings up to 100 kNm.

The internal mechanical driven pump has been specially adapted for low operating speeds and to withstand wind-milling conditions. There is increased distance between the propeller and the high-speed input shaft to reduce vibrations and there is extended bearing span on low-speed shaft bearings. Bearings have been carefully selected to withstand high axial loads.

Green said BMG’s ‘dry’ Hansen M4 compact gear units for ACCs, are known for efficient performance and long service life in arduous operating conditions. This series is available from BMG in six size units, from DA to FX, as 2 stage units in ratios from 9/1 to 25/1.
“The internal backstop is situated in the IEC or NEMA motor size lantern housings, for effortless installation and removal. The addition of an internal cooling fan in the lantern is also possible to assist in ensuring that the compact gearbox remains within an adequate thermal operating limit.”

New to the Hansen range of gear units for dry and wet cooling towers, is the recently launched M5CT range, which are right angle vertical gearboxes that have been further developed for cooling technology. This series, with high resistance in corrosive and extreme humidity environments, has a proven design, maximum load capacity, minimum losses and quiet operation. M5CT units are also compliant with stringent CTI specifications.

Features of these new units include a rigid housing design that can withstand peak loads, which is enhanced by cooling fins with flexible cooling options. The well-balanced design and advanced micro geometry of the gear results in an optimised pressure distribution that absorbs high shock loads.

The new M5 range has been designed for easy replacement of the existing P4 cooling tower range and to match the footprint or shaft height, without excessive installation adaptations.

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