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1. (WO2017188821) BALL JOINT FOR CONNECTING A RISER SUBJECTED TO HIGH TENSILE AND ANGULAR LOADS TO A PIPE CONNECTOR ON A FLOATING UNIT

Pub. No.:    WO/2017/188821    International Application No.:    PCT/NO2017/000011
Publication Date: Fri Nov 03 00:59:59 CET 2017 International Filing Date: Wed Apr 26 01:59:59 CEST 2017
IPC: F16L 27/053
F16L 27/067
F16L 27/073
Applicants: APL TECHNOLOGY AS
Inventors: ASKESTAD, Sigmund
Title: BALL JOINT FOR CONNECTING A RISER SUBJECTED TO HIGH TENSILE AND ANGULAR LOADS TO A PIPE CONNECTOR ON A FLOATING UNIT
Abstract:
The invention relates to ball joint for connecting a riser subjected to high tensile and angular loads to a pipe connector on a floating unit, the ball joint comprising: • a suspension house (16) comprising a spherical inner side (25), a suspension house neck (10) and upper flange (11), wherein a toroidal bearing ring (23), having a bearing liner (24) fastened to its inner surface, and an upper mating surface (51) fastened to the corresponding mating surface (22) on the lower side of the suspension house (16); • a spherical suspension ball (14), which is complementary to the inner side of the suspension house (16), comprising a suspension ball neck (13) and lower flange (12), • wherein the suspension ball (14) is provided with a recessed portion (53) on the inside of the top portion of the suspension ball (14), the recessed portion comprising a tangential/cylindrical surface (46) and a transverse circular plane surface (39); and a seal ring (17) is positioned on top of a bias ring (19) in the recessed portion (53); • wherein the seal ring (17) provides at least one spherical seal (29, 31) in sealing contact with the inside of the suspension house (16) and at least one piston seal (28, 30) in sealing contact, with an inner cylindrical surface (46) of the recessed portion (53) and wherein the bias ring (19) provides biasing means (32) biasing the seal ring (17) in a direction parallel to the axis of the neck (13) and away from the bias ring (19).