Abstract: In a medium-pressure steam turbine of single-flow chamber type design, for use as a ship's turbine, cooling steam is conveyed via holes in the wall of the inflow part for cooling the rotor surface and the first few rows of rotor blades. The cooling steam is guided by a baffle at the wall of the inflow part to annular spaces between the shaft seal of the guide vanes and the rotor surface and via axial cooling ducts in the rotor to the bases of the rotor blades. At each rotor blade of the rows connected by the axial cooling ducts, radial connecting canals are provided in the blade bases for guiding the cooling steam into axial canals which connect the annular spaces under the shaft seals of the adjacent guide vanes.

Abstract: In a device for turning a nut on one stud or tensioning bolt of many, arranged on a pitch circle, the nut is connected to one half of a positive, torque-transmitting clutch which can be pulled apart in the axial direction. The other half of the clutch is supported on a drive bushing carried on the stud or tensioning bolt, being moveable thereon in the lengthwise direction. The upper end of the drive bushing is connected to a gear which meshes with the pinion of an electric motor mounted on the outside of the support body of the device. When the nut is screwed off of a stud, it is contained in the drive bushing in such a way that no extra elevation is not required.

Abstract: An improved device for turning a nut means on a screw bolt arranged on a bolthole circle wherein the device includes: a support ring having recesses for receiving the bolt and the nut means; a turning unit fastened to the ring for imparting rotary motion to the nut means; and a transport safety means for engaging and retaining the nut means when it reaches its unscrewed end position. In accordance with the invention, the improvement comprises employing a nut means having a threaded portion for engaging the transport safety means and including in the latter means a member attached to the support ring and in surrounding relationship to the bolt, the latter member having a counterthread and being positioned so that the threaded portion of the nut means is engaged by the counterthread before the nut means reaches its end position.

Abstract: An arrangement for measuring the pre-tension of a threaded bolt having a central drill hole. A part is fastened to the lowest point of the drill hole and the difference in length of the part relative to the threaded bolt is determined via a length measuring device. An electric holding magnet, introduced into the hole, is fastened to a cable running from a cable drum and carrying an electromagnet, which, when excited, adheres to the closed hole at its lowest point; the cable is tightened and its length is held constant by a ratchet. The cable drum is movably supported on a tube connected to the threaded bolt in such a manner that, when the cable is loose, its carrier is pushed by a spring surrounding the tube against an upper flange on the tube; a length measuring device borne on the carrier contacts a surface of the tube. The measurement is performed with the cable tightened and its length held constant by the ratchet.

Abstract: Apparatus for measuring the pre-tension of a threaded bolt which is elongated by means of a tensioning unit and a screwed-in tensioning bolt; a measuring rod is inserted into a central hole in the threaded bolt and the difference in length is determined by means of a length measuring device.The measuring rod is guided in the housing of the tensioning unit, secured against rotation, and is threaded to engage a threaded bushing. The threaded bushing is longitudinally movable and secured against rotation in a bushing having external teeth. Rotation of the tensioning bolt is transmitted via gears to the threads on the measuring rod and converted into an up or down movement. The measurement may be made when the measuring rod comes to rest at the lowest point of the central hole.

Abstract: An apparatus for measuring the pre-tension of a threaded bolt by means of a two part measuring rod introduced into a central hole of the threaded bolt and of a length measuring device.The measuring rod includes an upper rod threaded to a lower tube which is secured against rotation. Rotation of the threaded rod by a motor moves the end of the measuring rod in or out of the central hole.

Abstract: A device for tensioning a screw bolt wherein the device comprises a lifting cylinder having a piston and arranged on a support ring and means responsive to the piston for engaging the screw bolt in a positive locking manner including: a first member engaged by the piston; a second member hinged to the first member; and guide surfaces for pressing the second member against an engagement surface of the screw bolt in a positive engaging and self-locking manner.

Abstract: A tool joint for well drilling pipe includes a body having a wear protector including a split ring disposed in an annular groove in the tool joint body, the ring segments being welded together and to the groove portion of the body. Hardmetal elements secured in the outer periphery of the ring are irregularly distributed, with the distribution or density of the hardmetal elements being greatest adjacent to the end of the tool joint body and progressively less inwardly from the end of the tool joint body.