Abstract: The device contains a tension chain with link plates (10) and thrust pieces (7) which are joined to one another via joints (9). Each thrust piece (7) has two flanks (5, 6) for abutting flanges (1, 2) of the pipe connection. The first of flanks (5) is tilted to plane (E1) which is perpendicular to the axes of joints (9) at a first angle. Second flank (6) with this angle forms a second smaller angle. The second angle can be equal to zero. Furthermore, the device contains tensioning device (21) for drawing two adjacent joints (9) against one another. Tensioning device (21) is arranged such that tensile forces (A) exerted by it run on the side of plane (E1) which faces away from second flank (6). Plane (E1) is perpendicular to the axes of joints (9) and passes though edge (B) of first flank (5) which is nearer second flank (6). The device is suitable for flanges (1, 2) which are differently conical or of which one (2) can also be flat externally.

Abstract: A device for forcing two conical flanges (1, 2) of a pipe coupling together under pressure with a seal (3, 4) between them, comprises a clamping chain with several straps (23) joined together by hinges (10). Thrust pieces (9) each have two flanks for contacting the two conical flanges (1, 2). Each thrust piece (9) is pivotably supported on a respective one of the chain hinges (10) and has on each of its two flanks two spaced supporting zones (16) for contacting the two flanges (I). The position of the thrust piece (9) is thus precisely determined by the support on the chain hinge (10) and the contact with the flanges (I) by the two supporting zones (16). The thrust piece (9) need not transmit any tensile forces in the clamping chain, and it can be small and lightweight.