API STD 608

Anotácia textu normy API STD 608 :

This standard specifies the requirements for metal ball valves suitable for petroleum, petrochemical, and industrial applications—corresponding to the nominal pipe sizes in ASME B36.10—that have:

• •    flanged ends in sizes DN 15 through DN 600 (NPS 1/2 through NPS 24);
• •    butt-welding ends in sizes DN 15 through DN 600 (NPS 1/2 through NPS 24);
• •    socket-welding ends in sizes DN 8 through DN 50 (NPS 1/4 through NPS 2); and
• •    threaded ends in sizes DN 8 through DN 50 (NPS 1/4 through NPS 2).

This standard applies to metal ball valves with pressure classes as follows:

• •    flanged ends in Classes 150, 300, and 600;
• •    flanged ends in Classes 900, 1500, and 2500 in sizes DN 15 through DN 50 (NPS 1/2 through NPS 2) only;
• •    butt-welding ends in Classes 150, 300, and 600;
• •    butt-welding ends in Classes 800, 900, 1500, and 2500 in sizes DN 15 through DN 50 (NPS 1/2 through NPS 2) only;
• •    socket-welding ends and socket-welding by threaded ends in Classes 150, 300, 600, 800, 900, 1500, and  2500;
• •    threaded ends in Classes 150, 300, 600, and 800.

This standard establishes requirements for bore sizes described as:

• •    full bore;
• •    reduced bore. See more