Liquid Ring Vacuum Pumps and
Compressors for Petroleum,
Chemical, and Gas Industry Services
API STANDARD 681
FIRST EDITION, FEBRUARY 1996
REAFFIRMED, NOVEMBER 2010
Liquid Ring Vacuum Pumps and
Compressors for Petroleum,
Chemical, and Gas Industry Services
Manufacturing, Distribution and Marketing Department
API STANDARD 681
FIRST EDITION, FEBRUARY 1996
REAFFIRMED, NOVEMBER 2010