Patent ID: 6634352
Filing Date: 2003-10-21
Classification: F16L,F23J,F23L

Abstract:
A vent pipe for directing gases from a source to an outlet, said vent pipe comprising:a plurality of pipe segments longitudinally connected to form said vent pipe, one of said pipe segments including: an inner pipe forming an inner passageway, said inner pipe having a first end and a second end wherein said first end includes an annular groove and keyhole slot proximate said annular groove; an outer pipe having a larger diameter than said inner pipe and disposed concentric with said inner pipe to form an outer passageway between said inner pipe and said outer pipe, said outer pipe having a first end and a second end; said pipe segments longitudinally connected to form said vent pipe such that said first end of said inner pipe is sealingly matingly received within said second end of said inner pipe of an adjoining pipe segment and said first end of said outer pipe is lockingly matingly received with said second end of said outer pipe of said adjoining pipe segment whereby said adjoining pipe segments are interconnected to allow for variances in thermal expansion between said adjoining pipe segments; and a seal member including a graphite material to facilitate mating connection of said adjoining inner pipes, said seal member extending circumferentially around said first end of said inner pipe such that said seal member seals the space between mated ends of said adjoining inner pipes and wherein said keyhole slot positionally captures said seal member.