Device for fastening a manoeuvrable plug for plugging of pipes
AssigneePlugging Specialists International ASA
InventorHarad Syse
Life of this patent
Estimating the term…
Abstract
Arrangement at a plug for sealing liquid- or gas-carrying pipes, comprising several slips (15) arranged peripherally on the plug, so as to allow them to be pushed up along a conical force ring (25) by means of a hydraulic cylinder (5), where the slips (15) are provided with a possibly divided sliding surface (19, 19′) and at least one possibly divided sliding surface (20, 23) having an angle that differs from the angle of the sliding surface (19, 19′). The force ring (25) has sliding surfaces (27, 29, 29′, 31) that correspond to the sliding surfaces (19, 19′, 20, 23) of the slips. The first part of the sliding surfaces (20, 23, 27, 31) has a steep gradient and the second part of the sliding surfaces (21, 21′, 29, 29′) has a small gradient.
Claims6
A plug for sealing liquid- or gas-carrying pipes, comprising several slips (15) arranged peripherally on the plug, so as to allow them to be pushed up along a conical force ring (25) by means of a hydraulic cylinder (5), characterized in that the slips (15) are provided with at least one slip sliding surface (21, 21′) and at least one slip front sliding surface (20, 23) having an angle relative to a longitudinal axis of the plug that differs from the angle of the slip sliding surface (21, 21′) relative to the same axis, where the slips (15) are arranged to engage an inner surface of the pipe in a gripping position while in abutment against an angled surface of the force ring (25) which is not parallel with the longitudinal axis of the plug.
Dependencies are inferred from the claim text.