Abstract: In an assembly for cylindrical drill pipes made for the transport of different kinds of fluids, a combined flange assembly can combine the functions and can be assembled under low time consumption and at low cost. Drill rods are connected by axially directed bolts inserted in the outer wall of a first drill rod (1) and extending axially past the end of the first drill rod (1) into internally threaded blind holes (21, 22) in the next drill rod to be connected to the first drill rod. Each terminal surface of a drill rod is made with arrangements (13-17, 23-27) for at least one coupling plug (31, 33) for the transport of different kinds of fluids in the drill string.

Abstract: A long electrical motor mainly for submersible use having a high efficiency, being mechanically stable, capable of being assembled under low time consumption at low costs, and which is easy to maintain and repair. The long motor has a rotor divided into sections with at least one low friction bearing arranged between the sections and in each end of the long motor. A stator is stacked continuously past internal bearings using thin sheets of metal discs between the bearings. Each disc in the bearing pedestal is significantly thicker than the common stator discs and is made of paramagnetic metal with good heat transfer properties. The inner diameter of each disc in the bearing pedestal is smaller than the inner diameter of the common stator discs so that a bearing inserted into the bearing pedestal is held by a tight fit. The inner diameter of the bearing fits tightly to the axis of the rotor and slots for the stator windings in all metal discs are radially open towards the rotor.