本规程规定了液环真空泵和压缩机、驱动器及相关设备的要求。本规程描述了液环真空泵、压缩机和采用液环机的系统的标准布置。本规程提供了一个框架，用于为驱动功率小于或等于150 kW（200 hp）的系统指定撬装液环机系统“包”。这种做法适用于简单的直流布置、部分再循环和总再循环系统。注释:本规程可与API 681结合使用。本规程包括一份液环机数据表RESP004-DM/D。 本数据表可用于传达买方要求；然而，可能需要补充信息来全面定义过程要求。供应商网站提供了LRV机器如何运行的出色可视化效果。

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.