Page 283 - Compression Machinery for Oil and Gas

268 SECTION II Types of Equipment

FIG. 6.13 Dry screw with torsion shaft.
Two-Stage Casing Arrangement

Dry screw compressor trains may consist of one single stage or more stages.
Normally each stage has its own separate casing. The casings can be arranged
in tandem with one stage driving the other directly or in parallel where each
stage is connected to a separate pinion of the gearbox (Fig. 6.14). The parallel

FIG. 6.14 Two-stage arrangement for dry screw.