NES Range of Hydraulic Powered Sludge Pumps and Power Packs
NES 400 Series Hydraulic Power Packs
The NES 400 Series are a range of hydraulic power packs for use in Tank cleaning and other oil and sludge applications including lagoons and separators. The current range is from 56 to 150 kW diesel driven and fitted with variable displacement hydraulic pumps. Fitted as standard are a range of safety features including full engine protection on loss of oil pressure or overheating. Also fitted with spark arrestor on the exhaust and Chalwyn shut down valve on the engine air intake ensures their suitability for work in refineries and other plants. Other features include pressure monitoring and regulation and flow control. Pressure outlet and inlet are via quick release couplings connected to hydraulic hoses, which are connected directly to the NES 405 mobile hydraulic reels. The Hydraulic reels are fitted with sheathed hoses which are in turn connected to the equipment such as a MOVer, a lobe pump, a helical screw pump or a centrifugal pump, a LAGOONer or other equipment.
The return line from the equipment and in turn the mobile hose reels returns to the hydraulic power pack’s oil reservoir via a fan cooler and filtration units to ensure the temperature and quality of oil is maintained. In the event of the hydraulic oil overheating the power pack is fitted with an automatic shut down device.
NES 600 series Rotary Lobe Pumps
Of simple yet robust construction the NES 600 series of Lobe pumps are the industry standard workhorse for tank cleaning. Positive displacement Rootes type configuration of Nitrile lobes ensures high volume output. Because of their size these pumps are ideal for passing through tank manways and can also be used completely submerged. They delivery pressures are up to 6.3 bar and by the use of direct suction into the pump maximum delivery is obtained. A constant torque hydraulic motor drives the pump with the pressure setting arranged so that in the event of a large object entering the pump it will cause the pump to stall and so avoiding damage to the lobes. Reversal of the pump via the control lever will normally be sufficient to chuck out the object via the suction side. For use inside tanks the pumps are fitted to wheeled trolley to facilitate their movement inside a tank.
NES Rotary Lobe Sludge Pumps-how they work
New addition to the range of lobe pumps is the NES640S submersible pump, designed for lowering through 24inch manways
NES 501 series of Progressive Cavity Screw Pumps
Unlike the NES rotary lobe pumps these pumps are large and cumbersome, prior to the introduction of the lobe pump, these pumps were used inside the tanks. Their role today for tank cleaning is outside the tank, coupled to a holding tank which is filled by a lobe pump the screw pump is fed via a flooded suction and pumps at pressures up to 10 bar. The higher discharge pressure of these pumps allows them to be used to pump long distances and against high heads such as into another storage tank.
Other uses of smaller versions of these pumps is on the ROVer where it is equipped with its own on board pump and in the NES pre-treatment units where they are used as the dosing pumps for chemicals and polymers.
A constant torque hydraulic motor drives the pump with the pressure setting arranged so that in the event of a large object entering the pump it will cause the pump to stall and so avoiding damage to the nitrile rubber stator.
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