Low-permeability hollow spheres and pipe filled with the spheres

Details Low-permeability hollow spheres and pipe filled with the spheres Low-permeability hollow spheres and pipe filled with the spheres

1982-07-19

1983-07-19

Marcus, Stephen

Pipes and tubular conduits

Distinct layers

Coated

106288B, 138177, 138DIG9, 405171, C04B 3104, F16L 104, F16L 908

Patent

active

043939015

ABSTRACT:
Pipe adapted to be installed underwater at increased ocean depths by practical pipe-laying procedures comprises a porous cement shell filled with hollow spheres that are slowly permeable to water under pressure. The cement shell is filled with a sufficient volume of the hollow spheres to make the pipe only slightly heavier than sea water, providing a reduced weight that overcomes previous difficulties in laying pipe at great depths. Over a period of time after the pipe has been installed underwater, the hollow spheres gradually fill with water and make the pipe rest stably on the ocean bottom. The preferred spheres comprise porous core spheres coated with thin coatings that partially seal the spheres to the needed degree of permeability.

REFERENCES:
patent: 2991808 (1961-07-01), Siegmann et al.
patent: 3561494 (1971-02-01), Hackett
patent: 3864443 (1975-02-01), Hopkins
patent: 3935632 (1976-02-01), Maxson
patent: 4111713 (1978-09-01), Beck
patent: 4159189 (1979-06-01), Todd et al.

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