API STD 599

Annotation of standard text API STD 599 :

This standard specifies the requirements for quarter-turn metal plug valves, including the lift plug type, for petroleum, petrochemical, and industrial applications.This standard is applicable to:steel, nickel base, and other alloy plug valves with flanged or butt-welding ends and ductile iron plug valves with flanged ends in sizes 15 ? DN ? 900 (1/2 ? NPS ? 36);threaded or socket-welding end plug valves in sizes 15 ? DN ? 50 (1/2 ? NPS ? 2);plug valve bodies conforming to ASME B16.34, which may have any combination of flanged, threaded, socket welding, or butt-welding ends;lubricated and non-lubricated plug valves that have two-way coaxial ports (three-way and four-way plug valves do not fall under the scope of this standard);tandem plug valves that have two independently operating plugs in a single body. See more