Rust-resistant sleeve for use in a branch hole of a water pipeli

Details Rust-resistant sleeve for use in a branch hole of a water pipeli Rust-resistant sleeve for use in a branch hole of a water pipeli

1998-08-05

1999-10-26

Arola, Dave W.

Pipe joints or couplings

With casing, lining or protector

Lined

285197, 2853824, 285422, 285906, 285925, 277934, F16L 914

Patent

active

059714417

ABSTRACT:
A rust-resistant cylindrical metal sleeve for preventing rust and corrosion from developing around the wall of a branch hole when the sleeve is rigidly fitted into a branch hole that is drilled through the wall of a metal conduit such as a water pipeline. The sleeve has a projecting portion on its outer circumference and an inner flange portion inwardly projecting at its lower end. The metal sleeve on its outer circumference is coated with a water-absorbing swelling rubber into which a synthetic resin rubber and a water-absorbing polymer are blended. Preferably, 100 parts by weight of styrene-butadiene rubber or ethylene-propylene-dienemetylene linkage rubber is blended with 10 to 40 parts by weight of the water-absorbing polymer. Since the water-absorbing swelling rubber increases its volume as it absorbs water, pressure in the rubber increases, preventing water ingress through between the metal sleeve and the wall of the branch hole.

REFERENCES:
patent: 2445273 (1948-07-01), Kennedy
patent: 2449616 (1948-09-01), Pennella
patent: 3951438 (1976-04-01), Scales
patent: 4558875 (1985-12-01), Yamaji et al.
patent: 4613171 (1986-09-01), Corcoran
patent: 5817713 (1998-10-01), Pappas et al.

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