This specification establishes standards of performance and quality for the design@ manufacture@ and fabrication of marine drilling riser equipment used in conjunction with a subsea blowout preventer (BOP) stack. This specification provides the requirements for the following major subsystems in the marine drilling riser system: ?? riser tensioner equipment; ?? flex/ball joints; ?? choke@ kill@ and auxiliary lines; ?? drape hoses and jumper lines for flex/ball joints; ?? telescopic joint (slip joint) and tensioner ring; ?? riser joints; ?? buoyancy equipment; ?? riser running equipment; ?? special riser system components; ?? lower riser adapter; ?? riser coupling. If product is supplied bearing the API Monogram and manufactured at a facility licensed by API@ the requirements of Annex A apply.