| 摘要 |
A jacketed pipe flange 10 for connection to an end of an inner pipe 12 and to an end of a jacketed outer pipe 14 surrounding the inner pipe includes a central throughport 16 for mating with the inner pipe. The first annular sealing surface 18 surrounds a central throughport for sealing fluid within the inner pipe, a second annular sealing surface 20 surrounds the first sealing surface, and a third annular sealing surface 22 surrounds the second annular sealing surface for sealing fluid in the jacketed outer pipe from the exterior of the flange. An annular gap 24 separates the first and second sealing surfaces, and a test port 26 fluidly connects the annular gap with an exterior port in the flange. A plurality of axially extending throughports 34 in the flange between the second and third sealing surfaces pass fluid through the jacketed outer pipe and the flange to downstream components.
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