Abstract: A boring apparatus, such as a drilling apparatus for forming holes in pressurised pipes, comprises a cutting head (5) mounted to a distal end of a boring bar (2) which is itself connected to a feed screw (3) by a feed nut so that relative rotation between the boring bar (2) and the feed screw (3) cause the cutting head (5) and boring bar (2) to traverse axially along the feed screw (3) whilst the cutting head (5) is rotated for cutting. The apparatus has a main drive motor arranged to drive the cutting head (5), boring bar (2) and a main drive shaft (4). The main drive shaft (4) and the feed screw (3) are operably connected at the proximal end through a pair of adjacent coaxial planetary gear assemblie (6) whose planetary gear carriers are liked to rotate in unison about the axis.

Abstract: A closure assembly for terminating an end of a pipe (4) has an end-cap (4) holding and having fluid-tight connection to a mutually coaxial cylindrical plug (2) and circular collar (3). The plug (2) and the collar (3) are configurable between respective engaged and disengaged configurations and mutually spaced to provide an annular space therebetween when the plug (2) and collar (3) are in their disengaged configurations. The annular space is arranged to receive an end of a pipe (1) arranged coaxially with the plug (2) and collar (3), the plug (2) and collar (3) being respectively slidable into and over the end of the pipe (1). The plug (2), when in its engaged configuration, grips the inner face of said pipe (41) and to provide a fluid tight seal and the collar (3), when in its engaged configuration, grips the outer face of the pipe (1) and to provide a fluid tight seal.

Abstract: Apparatus for periodically testing the operation of safety valves on pressure apparatus or vessels, comprises a load-bearing structure (P) fixedly arranged with respect to the pressure apparatus (R), a thrust generating assembly (7) cooperating with said load-bearing structure (P), and for gripping the safety valve (V) being tested. A dynamometer device (9) cooperates with the thrust generating assembly (7), and measures the force applied by the thrust generator (7) to the safety valve (V).

Abstract: A bore plug comprises a deformable sleeve to fit inside a bore to be plugged, two tapered members interfitting with the sleeve to engage opposite ends thereof, and an intercoupling of the tapered members actuatable to draw the latter together and deform the sleeve into circumferential engagement with the interior of the bore at or near each end of the sleeve. Provision of bored channels in one of the tapered members and the sleeve allows introduction of flowable sealing material after deformation of the sleeve.