FLANSCHVERBINDUNGSVORRICHTUNG MIT EINEM STATISCHEN KUGELGELENK

摘要

The invention relates to couplings for fluid flowlines and more particularly to couplings that can be dismantled comprising flanges and a static ball-and-socket joint for use with flowlines having a diameter lying in the range 40 mm to 200 mm and transporting fluids (gases or liquids) of high penetrability, at high temperature of up to 800° C., and at high pressure of up to 450x10⁵ Pa. Teh device comprises a flanged coupling device with a static ball-and socket joint comprising a first coupling member ( 1 ) having a conical sealing surface ( 8 ), a second coupling member ( 3 ) having concave sealing surface ( 10 ) of spherical shape, a two-barrier metal gasket ( 2 ) disposed between the sealing surface ( 8, 10 ) of the first and second coupling members ( 1, 3 ), and assembly means ( 4 ) for assembling the first and second coupling members ( 1, 3 ) together so as to hold the gasket ( 2 ) between their respective sealing surfaces ( 8, 10 ). The metal gasket ( 2 ) is made of a refractory granular nickel alloy that withstands hydrogen, having uniform fine grain structure with isotropic properties and coated in three sealing layers, the first layer ( 27 ) being of nickel, the second layers ( 28 ) being of silver, and the third layer ( 29 ) being an antifriction lubricant of an inorganic material that is compatible with the fluid used.