Patent ID: 6173968
Filing Date: 2001-01-16
Classification: F16J,F16L

Abstract:
A sealing ring assembly comprising:a first pipe member having an inner circumferential surface;a second nine member having an outer circumferential surface mated with said first pipe member inner circumferential surface to provide a pipe joint, said second pipe member having a sealing chamber adjacent the pipe joint;an annular sealing ring within said sealing chamber to provide a fluid seal of the pile joint, said annular sealing ring having an upstream annular surface and a downstream annular surface;an annular backup ring within the sealing chamber and having an upstream annular surface and a downstream annular surface, said annular backup ring downstream annular surface being substantially flat, and said annular backup ring upstream annular surface being arcuate, said annular backup ring upstream annular surface being adjacent said sealing ring downstream annular surface, said annular backup ring having a split therein to permit radial expansion of said annular backup ring, said annular backup ring having a greater thickness on its outer periphery than on its inner periphery to permit pressure of said annular sealing ring against said annular backup ring upstream annular surface to expand said annular backup ring radially.