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Heavy duty dewatering pumps keeping rail project on track

article image Mono E Range pump

Five E Range pumps from NOV Mono were selected for use in challenging mine dewatering duties in Hong Kong.

Proven qualities such as excellent build quality, reliable performance and wear resistance in demanding applications contributed to the selection of NOV Mono’s E Range dewatering pumps. These pumps replaced the original submersible pumps that were being used on dewatering and waste water transfer operations, and were expensive to operate and subject to frequent damage.

The Mono high pressure pumps are being used in the construction of two new express rail tunnels, Shek Yam and Pat Heung, which will eventually form part of Hong Kong’s Mass Transit Railway system. The pumps were chosen for their ability to withstand the high volume of drill cuttings, mud and concrete found in the fluids being pumped. 

In the eighteen months since they were installed, the pumps have run for more than 4,800 hours without the need to change any parts. The pumps on the sludge transfer duties have operated for 24 hours per day without any problem, since they were first installed.

Derrin Cikoja of the tunnel construction site management team, who worked closely with the Mechanical Superintendent, Paddy Gallagher said that the Mono pumps run at 10 bar pressure and handle an average of 20 litres of fluid per second, providing them with a high dollar-to-dewater ratio, which is helping to reduce their whole-life costs. The team plans to employ more Mono pumps on future projects. 

Mono’s E Range progressing cavity pumps are a well proven solution for this type of aggressive industrial application where reliable operation and a high resistance to abrasion and wear are required. 

Key features of the Mono pumps include the unique Flexishaft drive transmission with a 10-year warranty, which provides a single component link between the rotary motion of the drive shaft and the eccentric motion of the helical rotor; reduced number of moving parts in the drive train eliminating wear and lubrication requirements; high pressure capabilities eliminating the need for a series of pumps when pumping over long distances or high head requirements; low running speed and gentle pumping action minimising wear on the rotor and stator; and capacities up to 420m³/h and pressures up to 48 bar, all with a variety of sealing options. Higher pressure versions are also available.

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