This Practice provides the requirements for liquid ring vacuum pumps and compressors, drivers, and associated equipment. This Practice describes the standard arrangement for liquid ring vacuum pumps and compressors and systems employing liquid ring machines. This Practice provides a framework for specifying a skid mounted liquid ring machines system "package," for systems with drivers less than or equal to 150 kW (200 hp). This Practice can be applied to simple once-through arrangements, partial recirculation, and total recirculation systems.

Comment: This Practice can be used in conjunction with API 681.

A liquid ring machine data sheet, RESP004-DM/D, is included with this Practice. This data sheet may be used to communicate purchaser requirements; however, supplemental information may be necessary to fully define process requirements.

Vendor websites provide excellent visualizations of how LRV machines operate.