API Standard 599
Metal Plug Valves—Flanged, Threaded, and Welding Ends, Seventh Edition, January 2013
API Standard 603
Corrosion-resistant, Bolted Bonnet Gate Valves—Flanged and Butt-welding Ends, Eighth Edition, February 2013
API Standard 650
Welded Tanks for Oil Storage, Twelfth Edition, March 2013