Tandem rotary screw compressors

Sullair introduces its TSR-32 two-stage tandem rotary screw compressor with spiral valve. Designed primarily for the rental industry, the TSR-32 offers a choice of either fixed speed model TSR-32F, with a capacity of 1440 cfm and a pressure of 125 psig, or variable-speed-drive model TSR-32, with capacity ranges of 784 to 1600 cfm, and a pressure range of 100 to 175 psig. By combining tandem two-stage compression with a spiral valve, the Sullair TSR-32 provides both full-load and part-load efficiency, often providing a two-year payback in energy savings, the company says.

http://www.sullair.com/corp/details/0,10294,CLI1_DIV64_ETI6009,00.html