international
construction
november 2013
50
sewage applications, it offers a maximum flow of
2,250 litres/m and a maximum head of 18 m.
Tsurumi has also launched a life-extending
kit - a set of parts for Tsurumi’s KTV and
KTVE range of light-weight aluminium
pumps comprising a new pump casing,
wear ring and protection plate which the
company said could give a pump three times
longer life. One of the main applications is tunnel
construction, where pumps work in severe conditions.
New line-up
Meanwhile, Hatz is offering a new line up of clear- and trash-
water, and industrial pumps, based on its 1.5 kW up to 56 kW
air-cooled diesel engines.
The line-up ranges from small and lightweight one-cylinder
engine powered trash pumps with a capacity of 20 m³/h, up to
clear water pumps with a capacity of 830 m³/h powered by a four-
cylinder diesel engine.
Depending on customer requirements, the pumps can be
equipped with a trolley, closed tubular frame or base frame, and
there are other options available.
The C-series for construction sites is designed for use in
demanding conditions. Solids with a size of up to 40 mm can
be processed thanks to robust pump parts
and a pump housing made of aluminium
or cast iron.
Beside the pumps with a flow rate between
20 and 140 m³/h, there is a membrane pump available
which can process sludge with a solid content of up to 80%.
UK manufacturer Selwood says it is, “Bringing low emission
engines to the high head pump market,” with the introduction
of its H200 pump, powered by a Stage III/Tier 4 Interim Volvo
D16 engine.
The engine uses a diesel particulate filter and a diesel oxidation
catalyst in combination with selective catalytic reduction to
conform to the current emissions regulations, which apply in
Europe, Japan and the US.
The H200, with a pumping capacity of more than 950 m³/hr,
joins the already launched H100 and H150 units in the new high
head range.
The H150 is a heavy duty automatic self priming pump
designed for high head applications, with flow rates up to
460 m³/h, total heads of 124 m and solids handling of 38 mm.
Pam Meyer, equipment sales manager at Subaru Industrial
Power Products, also considers that a longer life for pumps is
important, and she pointed out that performing preventative
maintenance helped prevent pump downtime.
She said that each day should start with a pump inspection.
Among the most important daily checks is the quality and level
of engine oil.
Oil that’s contaminated can cause serious problems and decrease
the life of an engine, likewise if there’s an insufficient amount of
it. Change the oil or add if necessary to reach the level as per
manufacturer’s recommendation, she said.
The fuel level should be checked as well, while Ms Meyer
recommended looking for any evidence of fuel or oil leaks. If a
fluid is dripping, inspect the area for any parts that may need to
be tightened or replaced. Cleaning or possibly changing the air
filter is another important practice that can prevent significant
damage down the pipeline, said Ms Meyer.
In addition to daily checks, a pump requires other maintenance
checks and services. Ms Meyer said that while those don’t need to
be done daily, they are crucial to the pump’s life and should be on
a regular schedule. Generally, quality pump engines can operate
up to 2,500 hours, she said.
iC
Transmission challenge
Crucial dewatering of 250 km electricity scheme
A
remarkable 650 pumps are being rented by Skanska Maskin to contractors working on
a massive underground power cable project linking Sweden and Norway.
The
€
807 million (US$ 1.1 billion) South-West link project, which began in 2012,
includes the construction of 250 km of underground transmission lines to connect Sweden’s
power grid at Nässjö to the Norwegian grid in Oslo.
The new cable follows the route of old power lines through remote villages and forests, and in
areas prone to high rain levels and floods. The project is being implemented by Swedish utility
company Svenska Kraftnät and its Norwegian counterpart Statnett.
To combat the high water levels and occasional swamp-like conditions, Skanska Maskin has
supplied 650 Tsurumi pumps.
“These projects don’t come around very often,” said Magnus Malmerin, manager at Tsurumi-
Intec Sweden, “Using a hundred pumps is quite common but I have never experienced 650
being used on one project before.”
The project requires pipes to be installed in the ground every 30 to 50 m along the cable
trench, with the pumps placed inside the pipes to lower the water table before cables are
installed. Additional pumps are also placed directly in the trench where required. The pumps
are powered by movable generators and can be placed anywhere along the line.
“Some water is visible and very close to the surface but even if the ground appears dry,
lots of water is trapped underneath”, said Mr Malmerin, “When you start digging, water
floods the area, causing a potential safety hazard. Safety precautions are crucial because the
transmission cable will eventually be carrying about 1400 MW of electricity.”
There are three different models of Tsurumi pumps being used at the project, the lightweight
LB800 and the heavy duty KTV2-22 and KTV3-37 units.
On-site workhorses
PUMPS
Thompson Pump is now offering a ‘Compact’
range which has the features of the
company’s JSC in a smaller package,
with less weight, fewer parts, less
maintenance and a lower price.
Subaru says that among the most important daily
checks is the quality and level of engine oil.
