Pipeline road crossing sealing system

Details Pipeline road crossing sealing system Pipeline road crossing sealing system

1989-09-25

1990-06-05

Rivell, John

Fluid handling

Destructible or deformable element controlled

Destructible element

73 405R, 405157, F16K 1714

Patent

active

049305360

ABSTRACT:
In a pipeline road crossing a pipeline is loosely surrounded by a casing under the roadbed with its ends vented to the atmosphere and sealed with the periphery of the pipeline to minimize oxidation of the pipeline wall within the casing. Access and pressure relief valves are connected with the casing vents at opposite sides of the road. This permits injecting gas under pressure into the casing annulus through the valve equipped vents and periodically monitoring the gas pressure.

REFERENCES:
patent: 2587933 (1952-03-01), Volpin
patent: 2816575 (1957-12-01), Stokes
patent: 2954797 (1960-10-01), Dryer
patent: 3459229 (1969-08-01), Croft
patent: 3582533 (1971-06-01), Albright et al.
patent: 4469469 (1984-09-01), Kennedy, Jr.
patent: 4723441 (1988-02-01), Sweeney
patent: 4724857 (1988-02-01), Taylor

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