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16/01/2007
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Enerpac’s ZA4-series of high-pressure hydraulic air-driven pumps is designed for in-plant, industrial applications and medium to large construction projects
 . It claims that its Z-Class pump design offers higher oil flow and bypass pressure – and the potential to improve productivity in any application. Because of their Atex 95 certification, the pumps are safe for use in environments such as refinery, petrochemical and oil & gas processing.
Reservoirs have capacities of 4-40 litres. A sight gauge on the 4- and 8-litre models and a level gauge on the larger reservoirs allow quick and easy oil level monitoring. The manual control valves come with a built-in user adjustable pressure relief valve. Standard models fit most applications, while many custom configurations are available.
The optional heat exchanger warms exhaust air to prevent freezing and cools the hydraulic oil.
Accurate flow
Smartflow is a sensorless flow measurement function that can calculate the flow of a centrifugal pump within 5% of the pump-rated flow – without the need for any external instrumentation. It is fitted as standard on the version 5.0 of Pumpsmart PS200 from ITT.
This function mathematically models the pump power curve with only four points of CDS pump performance curve data: BEP flow, BEP power, shut-off power and rated speed.
There are other new features. Advanced Pump Protection takes into account the hydraulic and mechanical loses associated when changing the speed of a centrifugal pump. A self calibration feature allows for an accurate representation of the pump to ensure it is protected at all speeds.
Positive Displacement Pump Protection (PDPP) is a sensorless function that protects a constant torque load such as a positive displacement pump. Because PDPP is used with constant torque loads it does not take into account changes in speed – as APP does. PDPP monitors for conditions such as high and low torque which can indicate that the pump has a blocked discharge or a starved suction.
Flexible power pack
Bosch Rexroth’s Alpha Pack modular hydraulic power units are versatile enough to meet the needs of most applications at a competitive price.
Power packs in the range are available with reservoir capacities of 100-1,000 litres, and can be supplied in versions with continuous delivery pressures up to 280 bar. They incorporate fixed or variable displacement pumps – including gear, vane or piston types – with power ratings of 2.2-55kW. They can support flow rates up to 171 l/min.
Controls are optimised for energy efficiency and safety, and can be arranged to provide constant pressure, flow- or pressure-controlled solutions, with automatic load sensing capabilities.
Appropriately sized accumulators further improve energy efficiency by allowing the power packs to cope with cyclic and emergency loads without the need to increase basic capacity.
Easy-to-use Power Unit Configurator software guides the user through the configuration process. The software also calculates pricing on the spot, producing a detailed quotation as well as an assembly drawing, circuit diagram and detailed parts list.
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Author
Tom Shelley
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