API 681

Std 681
Liquid Ring Vacuum Pumps and Compressors for Petroleum, Chemical, and Gas Industry Services
API Std 681 | 1st Edition | February 1996 | 2-Year Extension: November 2015 |

Covers the minimum requirements for the basic design, inspection, testing, and preparation for shipment of liquid ring vacuum pump and compressor systems for service in the petroleum, chemical, and gas industries. It includes both vacuum pump and compressor design and system design.