Definition(s)
Keyseating
Formation of a longitudinal slot on the ID of a riser component due to a loss of material caused by friction wear from the rotating drill string or tripping equipment.
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards
Keyseating
The formation of a longitudinal slot in the bore of a riser system component caused by frictional wear of the rotating drill string on the riser component.
Source: API RP 16Q, Recommended Practice for Design, Selection, Operation and Maintenance of Marine Drilling Riser Systems, First Edition, November 1993 (Reaffirmed August 2001). Global Standards
Key-Seating
Formation of a longitudinal slot in the bore of a riser system component caused by frictional wear of the rotating drillstring on the riser component.
Source: ISO 13624-1:2009, Petroleum and natural gas industries – Drilling and production equipment – Part 1:Design and operation of marine drilling riser equipment. Global Standards