Kaeser Kompressoren of Germany has developed a powerful portable compressor for applications with a high compressed air requirement.

The Mobilair 220, with its 21.3 cu m/min capacity, rounds off Kaeser's versatile range of portable machines.

The economical supply of compressed air on large construction sites, tunnel projects, sandblasting, concrete repair, or backup during conversion of stationary air systems are just a few of the applications that the latest model is suited for, says the company.

"Supplying 21.3 cu m/min of air at 8.5 bar, the Mobilair 220 fills the gap between the models 120 T and 260 with maximum capacities of 11.5 and 27 cu m/min respectively," says a spokesman for the company. "The compressor is designed for continuous running. Its heavy-duty components allow it to be used efficiently at temperatures up to 50 deg C and altitudes up to 1,000 m. The fuel tank capacity is sufficient for over eight hours of operation under full load.

"The package is fitted with a tough, turntable steering chassis specially suited to the rough conditions on construction sites."

Kaeser's extra equipment can extend the compressor's versatility even further, he points out. "For instance, the Mobilair 220 can be mounted on skids for static positioning on long-term projects such as tunnelling," he says. "Air treatment components allow the supply of cool, dry and technically oil-free air good enough for concrete repair or even of breathing quality. Another useful item is a special distributor that allows parallel take-off of air of various qualities."

Another recent addition to Kaeser's range of portable compressors is the Mobilair 121 which is said to feature particularly economical and environmentally-friendly concepts. The machine covers the standard pressure range of 7.5 to 13 bar and delivers 11.5 cu m/min at 7.5 bar.

The Mobilair 121 is designed to provide economic compressed air for construction sites, sandblasting, concrete repair and as a standby for stationary compressors, among other applications.

Compressor drive is from a water-cooled, turbo-charged diesel engine with intercooler that already fulfils the most stringent emission standards anticipated, says the spokesman. Furthermore, the package regulating system ensures optimum fuel economy.

"The fuel tank holds more than sufficient fuel for a complete working shift, running under full load. Heavy-duty design allows the machine to be used at ambient temperatures up to 50 deg C and altitudes up to 1,000 m," he says.

Instead of the standard towing chassis, the compressor package can be supplied mounted on skids. Optional additional equipment include air treatment systems of various classes to provide cool, dry, technically oil-free air.

"It is even possible to take off air of different classes simultaneously through a special distributor. A further option is the provision of a 12 kVA, three-phase, synchronous generator to make the M 121 a flexible energy source for the construction site," the spokesman adds.