Dutch civil engineering contractor Martens en Van Oord is relying on Tsurumi technology to perform pumping out operations on cofferdam excavation for the Hamburg U-Bahn.
For its pumping solution the company looked to Netherlands Tsurumi dealer, Distrimex Pompen & Service, for advice on a submersible pump suitable for heavy-duty dredging applications demanding high heads and flow.
After a full consultation, the Tsurumi LH 8110 was selected for the task. Featuring an 8in high-pressure pump with an output of 110 kW, the LH 8110 is the largest Tsurumi pump ever delivered from the Netherlands.
The high-capacity pump supplies 10 bar of pressure at a rate of more than 190m³/hr. As with all Tsurumi submersible pumps, the dual mechanical seals operate in an oil chamber, and are additionally lubricated by a patented oil-lifter. The pump comes complete with a chromium iron casting impeller and adjustable wear rings for increased wear resistance. Seal pressure relief ports provide a flow path above the pump casing and allow pressure to be released from the pump casing and away from the shaft. This protects the mechanical seals from excessive pumping pressure or water hammer in high head pumping applications.
In addition to pump-out operations, the Tsurumi unit is also being used by the contractor to loosen soil in the bottom of the construction pit, allowing sand to be pumped out using a dredge pump.
To perform this dual operation the contractor has modified the Tsurumi LH 8110 and combined it into a single system with the dredge pump. This has enabled increased maneuverability of the combined unit, which is suspended from a crane inside the construction pit.
Based in Doetinchem, Distrimex has been working with Tsurumi for more than 30 years, and is a leading partner in the pump industry throughout the Netherlands.
Excavation and dewatering of the pit is on schedule to be completed later this month (February).