Patent ID: 7753412
Filing Date: 2010-07-13
Classification: F16L,Y10S,Y10T

Abstract:
1. A vented gas riser apparatus conducting pressurized gas from a gas supply source line located below ground level to a delivery point disposed above ground level comprising: a) an elongated gas carrier pipe, said carrier pipe having a first pipe end disposed below ground level and sealingly connected at a first point of connection to said gas supply source line and having a second pipe end disposed above ground and sealingly connected to said delivery point whereby pressurized gas may flow through said carrier pipe from said gas supply source to said delivery point; b) a generally cylindrical protective casing, said casing having a first casing end disposed below ground level and second casing end disposed above ground level, said casing disposed around said carrier pipe and creating a gas escape passageway in an elongate annular space between said carrier pipe and said casing, wherein said protective casing includes a gas riser protective casing portion and a pipeline protective casing portion with said gas riser protective casing portion and said pipeline protective casing portion sealingly connected together with a casing boot; and c) a riser transition head having a first head end sealingly connected to said delivery point and having a second head end connected to said second casing end, said second head end including at least one vent passageway which provides a fluid connection with said gas escape passageway and with the atmosphere whereby gas which leaks into said gas escape passageway may escape through said at least one vent into the atmosphere, wherein said riser transition head includes a riser casing sleeve on to which a plurality of crimps are provided to connect said head to said riser casing with said at least one vent passageway being formed by the space between adjacent crimps.