Abstract: A device for inserting and removing studs 16 from bores 19 in a workpiece, for example a nuclear reactor vessel, comprises manipulating devices 22 for operating on individual studs. Each device 22 is capable of tensioning a stud 16, slackening a working nut 17 on the stud, and subsequently removing the stud from the bore. A ring 92 has dogs 93 which can engage recesses in the working nut to interlock with the nut against relative rotation. Motors 100 are coupled to the ring 92 and operable to rotate the working nut. A top nut 51 is coupled to motor 100 which are operable to rotate the nut and screw it onto the stud 16. The top nut 51 together with other operating parts of the device can be raised and lowered on a tube 61 by means of a hydraulic actuator 65. A hydraulic load cell 52 is located between the top nut and a stool 53 which rests on the workpiece.

Abstract: A bolt comprises a tapered shank. The shank comprises an outer member with a cylindrical bore and an inner member with a cylindrical outer surface that is a close fit in the cylindrical bore. The inner member is secured to the outer member at the broader end of the shank and a screw thread is secured on a portion of the inner member projecting from the narrower end of the outer member, for receiving a nut which is used in tensioning the bolt into the workpiece.

Abstract: A method of joining pipes in which a sleeve is placed over the adjacent ends of the pipes so as to overlap each pipe. The sleeve fits with clearance around the pipe ends. The ends of the clearance space are closed by inflating hollow sealing rings and then epoxy resin is injected into the clearance space to fill the space. The pressure of the epoxy resin composition is then raised to a pressure substantially greater than atmospheric and the pressure is maintained until the resin composition is set.

Abstract: A sealing arrangement between rotary shafts and structure which surrounds them particularly propeller tailshafts and the stern boss of ships. The sealing arrangement comprises two rubbing seals mounted in series along the shaft between the shaft and structure which surrounds the shaft, with a void space between the seals. A drain conduit extends from the seals and a tun dish is located in the drain conduit to indicate the ingress of fluid into the void. The rubbing seals are formed by the opposite radial faces of an annular flange extending radially out from the shaft and by wear rings biased axially against the opposite sides of the flange.

Abstract: A valve comprising a hollow cylindrical body with a valve opening at one end and a valve seat around the valve opening. A valve member is movable towards and away from the valve seat on a spindle which passes through a spindle opening opposite the valve opening. A handle is provided on the outer end of the valve spindle and has a screw-threaded counterbore which is engageable with a screw-threaded spigot on the outside of the valve around the spindle opening to hold the valve member in the closed position. In this position the end face of the valve member is flush with the outside of the valve around the valve opening. The upper side of the valve member has a screw-threaded counterbore engageable with a screw-threaded spigot on the inside of the valve around the spindle opening to hold the valve in the open state and form a seal around the spindle.

Abstract: A method of forming a joint between a metal structural tubular member and a metal sleeve. The method comprises placing the sleeve around a part of the tubular member so that there is a space between the sleeve and the adjacent part of the tubular member, closing the ends of at least a part of the space between the tubular member and the sleeve, injecting a hardenable composition into the space between the closed ends and maintaining the pressure until set.The method can be used for joining together structural tubular members or for repairing a damaged structural member.

Abstract: A method of joining pipes in which a sleeve is placed over the adjacent ends of the pipes so as to overlap each pipe. The sleeve fits with clearance around the pipe ends. The ends of the clearance space are closed by inflating hollow sealing rings and then epoxy resin is injected into the clearance space to fill the space. The pressure of the epoxy resin composition is then raised to a pressure substantially greater than atmospheric and the pressure is maintained until the resin composition is set.

Abstract: A pipe coupling comprising a sleeve which is fitted over the adjacent ends of the pipe sections. The sleeve has sealing means for sealing the sleeve against the pipe and gripping means for gripping the pipe. The sealing means comprises an annular groove which accommodates an annular tire the interior of which communicates with the exterior of the sleeve through a bore in the wall of the sleeve. The gripping means comprises arcuate groove sections on the inside of the sleeve which accommodates a tubular member or members which communicate with the exterior through bores in the wall of the sleeve, and jaw sectors with teeth which bite into the outside of the pipe. The tubular member or members and the annular tire are filled with a hardenable composition and maintained under pressure until set to force the sealing member into sealing contact against the outer surface of the pipe and cause the gripping teeth to bite into the outer surface of the pipe.

Abstract: A self-straining bolt comprises a hollow shank having a flanged and screw-threaded head at one end, a core member, a rod within the shank and secured to the other end of the shank a nut in screw-threaded engagement with the core bears against the shank at the said one end. The bolt is tensioned by means of a tensioning head comprising two coaxial jacking means, one for tensioning the hollow shank by bearing on the core member and the other for tensioning the core member by bearing on the shank head.

Abstract: The stern construction has an open channel let in to each side of the hull. The channel merges with the hull at its forward end and terminates in front of the upper part of the propeller disc at its rear end. The lower side of the channel is formed by a depending part of the hull which houses the tailshaft. The upper edge of each channel joins the part of the hull above the channel along a knuckle line. The upper side of the channel is disposed at an angle of inclination to the horizontal which decreases towards the rear of the ship so as to intercept the wake of the ship progressively and divert it into the upper part of the propeller disc.The invention is applicable to full bodied ships such as tankers.

Abstract: A shafting arrangement for a ship comprises a tailshaft supported in bearings in a stern tube which is rigidly mounted in the ship's hull. The tailshaft has a flange which is located in a self-aligning thrust bearing secured to the stern tube. The forward end of the tailshaft is coupled to one end of a tubular intermediate shaft by a first flexible diaphragm coupling which is secured at its periphery to the intermediate shaft and coupled by its hub to the tailshaft. A second flexible diaphragm coupling is secured at its periphery to the other end of the intermediate shaft and coupled by its hub to the output shaft of the propulsion unit or main gearing.