Definition(s)
Threaded Union Coupling
Coupling having mating threaded members on the pin and box to form engagement.
- NOTE: 1 Threads on one side of the coupling are free to rotate relative to the riser pipe such that the joint does not have to rotate to make up the coupling.
- NOTE: 2 The threads do not form a seal.
Source: API Specification 16Q, Design, Selection, Operation, and Maintenance of Marine Drilling Riser Systems, Second Edition, April 2017. Global Standards
Threaded Union Coupling
A coupling having mating threaded members on the pin and box to form engagement. Threads on one side of the coupling are free to rotate relative to the riser pipe so that the joint does not have to rotate to make up the coupling. The threads do not form the seal.
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
Threaded-Union Coupling
Coupling having mating threaded members on the pin and box to form the engagement.
- NOTE: The threads on one side of the coupling are free to rotate relative to the riser pipe, so it is not necessary that that the joint rotate to make up the coupling. The threads do not form the seal.
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