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This International Standard specifies requirements and gives recommendations for the design, rating, manufacturing and testing of marine drilling riser couplings. Coupling capacity ratings are established to enable the grouping of coupling models according to their maximum stresses developed under specific levels of loading, regardless of manufacturer or method of make-up. This International Standard relates directly to API RP 16Q, which provides guidelines for the design, selection, and operation of the marine drilling riser system as a whole.