Pipe joints or couplings – With casing – lining or protector – Lined
Patent
1981-04-02
1983-01-04
Lawrence, Evan K.
Pipe joints or couplings
With casing, lining or protector
Lined
29460, 15624415, 285286, 285293, B29C 2728, F16L 5700
Patent
active
043669727
ABSTRACT:
A seamless coating system especially applicable to a welded bell and spigot type joint for steel pipe of exceptionally great length and diameter features a double layer of coating material applied to the outside surface of the pipe and extending over the joint. Use is made of a filler bridge of substantially solid elastomeric material which, though yieldable when covered with the coating material and compressed, yields only to a limited degree. The bridge is made slightly thicker than the thickness of the pipe wall so that when the bridge is applied against a sharp corner at the joint, the bridge material extends above the corner both before and after two successive layers of coating material are applied to the exterior of the pipe wall and the joint. The composition of the bridge is such that it does not compress sufficiently to expose the sharp corner under loads imposed during fabrication of the system and during handling, storage, and shipment of the system, thereby to avoid having the corner create a thin condition in the coating material where it extends over the joint and impair the integrity of the coating.
REFERENCES:
patent: 2924546 (1960-02-01), Shaw
Ameron-Price Company
Beehler Vernon D.
Lawrence Evan K.
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