Compact Portable Submersible Dewatering Pump Tsurumi

Tsurumi Pumps LB-A
Tsurumi LB series submersible dewatering pumps are compact and lightweight for ease of use on building sites.

Compact Portable Pump

Model: Tsurumi LB series

Australian Pump have announced the availability of a lightweight submersible single phase pump designed for general dewatering projects in building and construction.  The LB series is manufactured by Tsurumi Pump at the Kyoto plant, Japan, which has the capacity to build up to one million units per year.

Tsurumi’s LB series was specifically designed for draining building and civil engineering sites.  The LB-480, weighing in at only 10 kilos, produced flows of up to 200 litres per minute, and maximum lifts, or vertical head of 10.5 metres.  The pump is powered by a single phase 0.48kW, capacitor start electric motor, and comes with 5 metres of heavy duty submersible cable.

“The LB series are loaded with features designed to give operators the best possible long life and low maintenance outcomes” said Aussie Pumps’ Craig Bridgement. “Many of these are quite unique to Tsurumi and are in line with their philosophy of a no-compromise design, to provide users minimal maintenance costs,” he said.

The pump’s motor is a dry type squirrel cage induction motor housed in a watertight casing.  It conforms to class E insulation and the LB-480 can be used in ambient temperatures of up to 40 degrees C.

The motors feature an inbuilt thermal motor protection device that reacts to the heat generated by an over current or dry run conditions.  This not only cuts off the motor circuit automatically, but also resets by itself.  That means that when the motor cools down to a safe operating temperature, the motor automatically restarts.

The LB-480 has a semi vortex design impeller that features a “high-gap structure” that minimises impeller lock.  Impeller lock can occur when the pump sucks in a large amount of sand at once.  The high-gap structure allows the pump to clear itself.  It is highly resistant to abrasion, and performance is largely unaffected by minor wear.  The impeller is an open style, allowing solids in suspension to easily pass through the pump.

The motor is protected by a dual inside mechanical seal, located in the oil chamber.  The seal has two sealing faces made of top quality materials including silicon carbide.

The advantages of the seal are twofold.  Firstly, it eliminates spring failure caused by corrosion, abrasion or fowling, which can prevent the seal faces from closing properly.  Secondly, it prevents the loss of cooling to the bottom seal faces during dry running conditions, which can cause the bottom seal to fail.  An oil chamber separates the two seals, providing super long life and uncompromising motor protection.

An Oil Lifter, developed exclusively by Tsurumi for their range of pumps acts as a lubricating device for the mechanical seal.  Utilising the centrifugal force of the shaft seal, the Oil Lifter forcibly supplies lubricating oil to the upper seal faces, even if the lubricant falls below the specified volume.  This amazingly simple device, developed by Tsurumi engineers, ensures lubrication and cooling and also stabilises the shaft seal and extends the length of the inspection and service periods substantially.

Another important Tsurumi feature is an anti wicking block provided at the cable entry section of the motor chamber.  Even if the cable jacket becomes damaged, or the tip of the cable is accidentally immersed in water, this device prevents water from travelling into the motor chamber through capillary action.

The Tsurumi LB series are designed for tough applications in construction industry.  They’re not only available as standard dewatering pumps, but also come with an automatic stop/start version that features an electrode style sensor that prevents dry running, saves power consumption, and extends operating life.  The pump’s outer casing is manufactured from powder coated steel, whilst the bottom casing is a synthetic rubber designed to be tough and hardwearing no matter what the application.

Further information on the complete range of Tsurumi submersible pumps is available on our Tsurumi dewatering pumps page or download our single phase lightweight drainage pumps PDF (1.06MB).


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