www.hpmag.co.uk HYDRAULICS & PNEUMATICS January/February 2024 21 low speed of rotation and a full-diameter impeller was sought after. An AHLSTAR WPP53-100 with a significantly bigger impeller diameter than in the previous pump was selected. Although the head is fixed, a lower rotation speed contributes to reduced wear. Other features adding to the prolonged lifetime of the pump are the wear-resistant design of a semi-open impeller and a casing fitted with a front wear plate. Increased productivity Due to the modular construction of the new AHLSTAR WPP, only worn parts of the pump must be replaced. In the earlier pumps, the lifetime of the parts subject to the highest erosion and corrosion was very short, between 3 and 6 months. Along with the pump replacement, the average lifetime of the parts was increased to 12 to 24 months, reducing the maintenance frequency by up to 75% from what it used to be. Given the harsh operating conditions and the vast improvements compared to the former installation, the replacement is considered to be very successful. After a few years in operation, the pump has proven to be such a major upgrade that more pumps at the site are replaced with AHLSTAR pumps. For further information please. visit: https://www.sulzer.com Technical details The pump is installed in the attack reaction unit where it is connected to the digestor. It feeds the slurry filter with phosphoric acid slurry produced in the reactor. Application – HH slurry filter feed pump Liquid – Reaction slurry with HH solids Flow / head – < 170 m?/h/< 35 m Pump type – AHLSTAR WPP53-100 Material of construction – Cast wetted parts in 654 SMO® Nominal speed – < 850 (rpm) (VSD) Lubrication – Oil Installation – Horizontal (common baseplate) Motor – 75 kW – 440 V – 60 Hz Transmission – Flexible coupling Mechanical seals – Dual mechanical seal SE2 AHLSTAR-WPP pump construction with closed dynamic seal Numerous specialised agricultural machinery feature a multitude of ancillary functions and individual modules integral to various agricultural processes. Notably, not all of these functions necessitate direct supply from the central hydraulics. Using compact decentralised mini hydraulic power units for driving and controlling these specific functions not only reduces tubing but also streamlines installation in close proximity to the control function. Examples of decentralised controllable functions in the harvester are the control of the discharge pipe or the ejection flap in combine harvesters and forage harvesters or the conveyor belts in potato and beet harvesters. In the HAWE Hydraulik product range, there are mini hydraulic power units for this purpose, which take over the power generation and control directly at the consumer. Due to their low size, they can be installed close to the consumer. The hydraulic power pack works as a self-sufficient unit and only needs to be powered. The machine manufacturer saves long hydraulic hose lines, reduces losses and simplifies commissioning. Two product types from the HAWE Hydraulik modular product kit include the mini hydraulic power pack type A100 - available with either DC or AC motor. In the case of the HR type, the built-in possibility of reversing the direction of rotation of the engine also makes it easy to control a double-acting cylinder. An additional directional valve is then no longer required for this. Furthermore, the mini hydraulic power unit type HR ensures overload protection of the motor by an integrated temperature switch and can be connected to various actuators. The installation position remains flexible, allowing for an arbitrary placement, while control remains consistent, facilitated, for instance, through a joystick within the driver’s cab. Upon scrutinising the machine design from the perspective of decentralised power generation and minimal energy consumption, additional functionalities inherent to this decentralised drive become apparent, yielding further advantages. For more information, please visit: https://www.hawe.com/products/mini-hydraulics/ Optimising agricultural efficiency: Streamlining machinery with decentralised mini hydraulic power units
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