Isolation gasket for critical service flow line applications

Details Isolation gasket for critical service flow line applications Isolation gasket for critical service flow line applications

H - Electricity

01

B

H01B 17/00 (2006.01) F16J 15/02 (2006.01) F16L 23/16 (2006.01)

Patent

CA 2132438

An isolation gasket (10) is provided for interposition between joined pieces of a flow line. The gasket (10) has a gasket body (12) which electrically isolates the pieces from one another. In one embodiment the gasket (10) has a pair of composite, insulative linings (16, 18) laminated on opposite sides of a metal core (14). An endless channel on each side of the gasket body (12) surrounds a central flow opening (20) and is formed of a depth sufficient to extend through the insulative lining (16, 18) and into the metal core (14). The outer sidewall (54, 74) of each endless channel (50, 70) is at an acute angle to its bottom wall (52, 72); and the inner sidewall (56, 76) is at an angle of at least ninety degrees with respect to the bottom wall (52, 72). The channels (50, 70) may be opposed to or offset from another.

On décrit un joint d'étanchéité isolant (10) destiné à s'intercaler entre les pièces adjacentes d'une canalisation. Il comporte un corps (12) qui isole électriquement ces pièces l'une par rapport à l'autre. Selon une variante, le joint (10) est doté de deux revêtements de matériau composite isolant (16, 18) appliqués de part et d'autre d'un noyau métallique (14). De chaque côté du corps de ce joint (12), on trouve un sillon circulaire qui entoure l'orifice central (20) destiné au passage du fluide et qui est assez profond pour traverser le revêtement isolant (16, 18) et mordre sur le noyau métallique (14). Les parois latérales externes (54, 74) des sillons circulaires (50, 70) présentent un angle aigu avec leur fond (52, 72) et leurs parois latérales internes (56, 76) présentent avec ce dernier un angle d'au moins 90 degrés. Les sillons circulaires (50, 70) peuvent se trouver en face l'un de l'autre ou décalés.

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