Japanese Patent JPH033119

B2

A vacuum sealing device includes a plug (58) which is thrust into a port (4) of an insulated steam injection tubing (1) for closing an annular space of the tubing which confines a vacuum. The plug (58) is mounted for movement within a first mounting element (30) and for movement within a bellows (32) having an end connected to the first mounting element (30). A second mounting element (34) is connected to the opposite end of the bellows (32) and carries a rod (40) which is fixed to the plug (58). By relatively moving the two mounting elements (30, 34) together, the bellows (32) is compressed and the plug (58) is thrust by movement of the rod (40). The first mounting element (30) is connected to an upper clamping section (12) which co-operates with a lower clamping section (14) to engage around a tubular member (3) to be plugged. The upper section (12) can be correctly centred with its plug (58) over the port (4) of the tubular member (3) by momentarily compressing the bellows (32) to extend the plug (58). The plug (58) is provided with a shank portion and a breakable tab for breaking the plug away from the shank portion. The shank portion is connected to the rod (40) so that after the plug (58) is seated in the port (4) the rod (40), its mounting elements and the clamp section (12, 14) can be removed from the insulated steam injection tubing (1).

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HOORU TOMASU ANDASON
RORENSU AAUIN
JON KURARENSU MASUYUUZU
CHAARUZU YUUJIIN HOOGU

JP20976586A

January 17, 1991

September 08, 1986

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BABCOCK & WILCOX CO

F16L59/06; F16J15/00; F16K51/02; F16L39/00; F16L41/06

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