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API Std 608

Metal Ball Valves-Flanged, Threaded and Welding Ends, Fifth Edition
standard by American Petroleum Institute, 11/01/2012

API Spec 6A Addendum 3

Addendum 3 to Specification for Wellhead and Christmas Tree Equipment, Twentieth Edition (ISO 10423:2009 Modification)
Amendment by American Petroleum Institute, 03/01/2013

API Spec Q2

Specification for Quality Management System Requirements for Service Supply Organization for the Petroleum and Natural Gas Industries, First Edition, Includes Addendum 1 (June 2016)
standard by American Petroleum Institute, 12/01/2011

API Std 537

Flare Details for General Refinery and Petrochemical Service, Second Edition (ISO 25457:2008, Identical)
standard by American Petroleum Institute, 12/01/2008