Atlas Copco has launched two new liquid ring vacuum pumps for use in demanding industrial processes. Capable of operating reliably in humid and dusty environments, the sturdy AWS and AWD units are designed to deliver vacuum to a wide range of industries including food and beverage processing, mining and minerals, petrochemicals, steel, cement, plastics, pulp and paper, textiles and pharmaceuticals.
Capacities for liquid ring pumps typically range from 170 to 37,500 m³/h. Lower capacity units below 5500 m³/h are available as single-stage AWS models or two-stage AWD models pre-configured with direct-drive options in 50 and 60 Hz speeds. For larger installations, high capacity AWL pumps with belt or gearbox transmission are available.
Single stage AWS pumps offer outstanding efficiency above 200 mbar (absolute), making them ideal for general process applications such as filtration and dewatering, and pump down or evacuation duties.
Meanwhile, the two-stage AWD pumps provide continuous high performance at operating pressures below 200 mbar (absolute). Two synchronised pump chambers work in series to achieve high performance and improved efficiency on continuous process duties such as drying, degassing exhausting and solvent recovery.
All AWS and AWD pumps can achieve ultimate pressure levels as low as 30 mbar (absolute). They are available in three pre-engineered modular configurations designed for once-through, partial recirculation or total recovery of service water. In most cases all wetted system components are manufactured from stainless steel.
“ We try to make our customers’ lives as easy as possible – so we offer all three configurations as pre-fabricated, plug-and-play modules, including pump, motor and water recirculation system mounted on a compact skid. This means they will receive a complete solution that can be easily installed and commissioned with a minimum amount of work. ”
The once-through pump is the module with the simplest design. It consists of a pump with an electric motor, drive system and skid. It is ideal for installations with an adequate supply of site water, which can then be continuously drained from the pump for re-use. The pumping system adds no contaminates to the service water other than those coming from the process.
In the case of partial recovery, the discharge liquid-process gas mixture is collected in a vessel where it is mixed with fresh sealing liquid to ensure a constant temperature in the pump. Excess liquid is released from the system via an overflow. Compared with once-through operation, this mode of operation typically saves 50 per cent of the fresh water required.
“With total recovery, liquid savings of up to 95 per cent are possible,” Oxley explains. The recovered liquid is cooled via a high efficiency heat exchanger before being returned to the pump chamber. “This configuration works with a closed liquid cycle and is recommended because it physically separates the cooling water circuit from possible process contaminates. ”
Atlas Copco Compressors is the GB sales and service operation of the Atlas Copco Group providing oil-free and oil-injected stationary air compressors, gas and process compressors, vacuum pumps, turbo expanders, nitrogen generators, air treatment equipment (such as compressed air dryers, coolers, and filters) air management systems, and custom designed engineered packages.
Atlas Copco Compressors’ sales and distribution network means that specialist compressed air advice and service is always within easy reach. A team of over 80 service engineers operates across the country, to ensure maximum running efficiency and minimum downtime at its customers' sites.
In the United Kingdom, Atlas Copco also handles the sales and marketing of construction and mining equipment, portable compressors and electric power generators, industrial power tools and assembly systems – all backed up by a nationwide sales, distribution, service and maintenance network.
Atlas Copco is a world-leading provider of sustainable productivity solutions. The Group serves customers with innovative compressors, vacuum solutions and air treatment systems, construction and mining equipment, power tools and assembly systems. Atlas Copco develops products and services focused on productivity, energy efficiency, safety and ergonomics. The company was founded in 1873, is based in Stockholm, Sweden, and has a global reach spanning more than 180 countries. In 2016, Atlas Copco had revenues of BSEK 101 (BEUR 11) and about 45,000 employees. Learn more at www.atlascopco.co.uk/compressorsuk.
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