The SGI-compressors had been developed mainly for use in O2/N2 PVSA and gas recycling systems, to get higher delivery pressure.
SGI offers 3 types of compressors for the different applications.
Low pressure range: Roots blower, rotary piston hooked type up to 3 bar abs
Medium pressure range: Screw compressors up to 7 bar abs
Higher pressure: Reciprocating piston type from 10 to 40 bar abs
High pressure up to 200 bar for cylinder filling.