| CPC F16L 17/02 (2013.01) [F16L 21/04 (2013.01)] | 27 Claims |

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1. A lockable pipeline seal for a pipeline, the pipeline comprising pipeline pipes and a pipeline sleeve, a tubular sleeve body insertable into the pipeline pipes; lockable pipeline seals positioned on the tubular sleeve body, the lockable pipeline seal comprising: a ring-shaped body having a head along a first ring end of the ring-shaped body and a tail along a second ring end of the ring-shaped body with a body portion between the head and the tail, the ring-shaped body having an outer surface and an inner surface along a periphery of the ring-shaped body, a deflection surface and a base surface defined along the outer surface, the deflection surface at an angle to a horizontal axis of the ring-shaped body, the deflection surface with the angle radially outwardly from the base surface; a recessed grip defined along the inner surface; and wherein the ring-shaped body is compressible such that, when the ring-shaped body is installed between the pipeline sleeve and the pipeline pipe, the deflection surface is urged against the pipeline pipe and the recessed grip grippingly engages the pipeline sleeve whereby a locked seal is formed between the pipeline sleeve and the pipeline pipe;
wherein the tail has a curved tail shoulder along the inner surface between a tapered surface and the body portion and wherein the tail has a grip tip defined along the curved tail shoulder and the tapered surface, the grip tip aligned horizontally with an inner radial surface of the tubular sleeve body of the pipeline seal.
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