Abstract: A tension ring lifting assembly (101) for securing around a pipe, the assembly comprising a tension ring (112) and at least one lifting lug (130) by which the tension ring, and a pipe around which the tension ring has been secured, can be lifted. The tension ring comprises: a plurality of collar segments (114, 116) which can be assembled into a ring around the pipe; a plurality of slip segments (140) adapted to fit between the collar segments and the pipe and to make direct contact with the pipe surface, the collar segments and the slip segments when assembled having inclined contacting surfaces such that an inner diameter across said assembled ring, between the inner faces of the collar segments, varies as the segments move up and down in the collar; means for tensioning (152, 154, 156) adjacent collar segments (114, 116) against one another to secure said ring around the pipe; and means for removeably mounting (7, 9) said at least one lifting lug (130) to the tension ring (140).

Abstract: A tension ring lifting assembly (101) for securing around a pipe, the assembly comprising a tension ring (112) and at least one lifting lug (130) by which the tension ring, and a pipe around which the tension ring has been secured, can be lifted. The tension ring comprises: a plurality of collar segments (114, 116) which can be assembled into a ring around the pipe; a plurality of slip segments (140) adapted to fit between the collar segments and the pipe and to make direct contact with the pipe surface, the collar segments and the slip segments when assembled having inclined contacting surfaces such that an inner diameter across said assembled ring, between the inner faces of the collar segments, varies as the segments move up and down in the collar; means for tensioning (152, 154, 156) adjacent collar segments (114, 116) against one another to secure said ring around the pipe; and means for removeably mounting (7, 9) said at least one lifting lug (130) to the tension ring (140).

Abstract: The present invention provides an apparatus for launching spheres into a gas riser in order to reduce the risk that the output from the riser is lost. The apparatus comprises a rotatable body that is rotated to a first position to receive an object from an object storage means in an aperture and the rotatable body is then rotated to a second position such that the object received in the aperture is received within a riser.

Abstract: The present invention provides an apparatus for launching spheres into a gas riser in order to reduce the risk that the output from the riser is lost. The apparatus comprises a rotatable body that is rotated to a first position to receive an object from an object storage means in an aperture and the rotatable body is then rotated to a second position such that the object received in the aperture is received within a riser.