Pipe lap joint with improved collapsible sealing zone

Details Pipe lap joint with improved collapsible sealing zone Pipe lap joint with improved collapsible sealing zone

1995-12-04

1996-12-31

Arola, Dave W.

Pipe joints or couplings

Frangible element

285382, 285403, 285420, 285424, 83687, F16L 3500

Patent

active

055886809

ABSTRACT:
A pipe lap joint is disclosed with an improved sealing zone and which comprises a pair of end-to-end intersecting slots in the outer pipe which allow the sealing zone to be collapsed against the inner pipe by a band clamp around the outer pipe. The outboard slot extends inwardly from the end of the pipe and the inboard slot is circumferentially offset and extends inwardly from the outboard slot. A frangible bridging segment of the wall of the pipe extends between the adjacent walls of the two slots and is deformed or fractured and maintains isolation between the slots when the pipe is collapsed. To facilitate collapse of the outer pipe, the length of the inboard slot is maximized for increased leverage of the clamping force.

REFERENCES:
patent: 4056273 (1977-11-01), Cassel
patent: 4113289 (1978-09-01), Wagner et al.
patent: 4629226 (1986-12-01), Cassel et al.
patent: 4660862 (1987-04-01), Cassel et al.
patent: 4753462 (1988-06-01), Liu
patent: 4902049 (1990-02-01), Umehara

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