CONNECTION OF PIPES MADE OF COMPOSITE MATERIALS Russian patent published in 2004 - IPC

FIELD: manufacture sand usage of pipe at oil fields. SUBSTANCE: connection of pipes made of composite materials includes connection elements ( bell and nipple) matching one another. Bell and nipple form connection with the help of two stopping members and one sealing element as minimum. Grooves and inlet holes in bell and grooves in nipple are cut for installation of stopping members. Bell is formed by winding of four-ten packages. Each package has two-three spiral- crossing layers of roving impregnated with polymer binder with reinforcement angle of 40-45 degrees and circular layer of roving. Half of spiral-crossing layers forms structural wall of pipe. One surface of grooves of bell is working and is formed by side surface of truncated cone with inclination angle of 45-55 degrees with axis. Another surface comes in the form of surface of body of revolution with curvilinear generating line. Curvature radius of curvilinear generating line exceeds radius of stopping members by 0.5-1.0 mm. Inlet holes in bell to accommodate stopping members are spaced apart by angle of 110-150 degrees in plane perpendicular to axis of pipe. EFFECT: simplified mounting of pipes, increased efficiency of their usage. 4 dwg