Patent ID: 7226089
Filing Date: 2007-06-05
Classification: F16L

Abstract:
1. A jacketed pipe flange for connection to an end of an inner pipe and to an end of a jacketed outer pipe surrounding the inner pipe and for sealing with a mating surface on another flange, the pipe flange comprising: a central throughport for mating with the end of the inner pipe; a first annular sealing surface surrounding the central throughport for sealing with the mating surface on the another flange to seal fluid within the inner pipe; a second annular sealing surface surrounding the first annular sealing surface for sealing with the mating surface on the another flange; a third annular sealing surface surrounding the second annular sealing surface for sealing with the mating surface on the another flange to seal fluid in the jacketed outer pipe from an exterior of the flange; an annular gap separating the first and second sealing surfaces; an inner annular seal sealing with the first sealing surface and with the mating surface on the another flange, and sealing with the second sealing surface and with the mating sealing surface on the another flange; a plurality of axially extending throughports in the flange between the second and the third sealing surfaces, such that fluid in the jacketed outer pipe passes through the plurality of throughports; and a pair of alignment stops each for positioning within and extending axially from a selected throughport, such that the inner annular seal rests on the stops to center the inner annular seal on the first and second sealing surfaces.