The method of connecting pipes
(57) Abstract:The invention relates to the construction of pipelines and can be used when connecting pipes. The essence of the invention: in the area of the joint between the pipes creating a constant magnetic field and in the pipe - directional flow of ferromagnetic particles. Under the action of the magnetic field of the ferromagnetic particles accumulate in the gap and fill it. Then the ferromagnetic particles is subjected to induction heating, which leads to surface fusion welded pipe in place of the gap, resulting ferromagnetic particles together with the molten material adjacent pipes connect together the parts to be welded. 1 Il. The invention relates to the construction of pipelines and can be used when connecting pipe.There is a method of permanent connection of pipelines, in which prior to Assembly on the contacting surfaces of piping and fittings is applied fluoropolymer coating, and after compression the connection is subjected to heating to the sintering temperature of PTFE 
There is also known a method of connecting pipes, in which, after installation of the pipes in the seam zone in the gap between them enter the hose, and then done the ski preparatory operations, required for pipe connections, and manufacturing to implement these methods for more details. In the first case, the application of fluoropolymer coatings, compressed, making the clutch sleeve, the second is the compression of the joint, the formation of ring-closed cavities shaped profile at the ends of adjacent pipes introduction in these cavities shaped hose, heating the adhesive mass, the curing her.Thus, a large number of mechanical operations associated with the use of accessory equipment not provide the performance of a method of connecting pipes.The technical result of the invention is to improve the performance of the method of connecting pipes.The technical result is achieved by the fact that after the execution of operations in the alignment and installation of pipes in the seam zone, in the zone of intersection create a constant magnetic field in the pipe form a directed flow of ferromagnetic particles, the gap at the interface of fill ferromagnetic particles, and are subjected to induction heating.The method of pipe connection is illustrated by a drawing, which shows the connection of pipes in the section.The connection pipe is as follows.The flow of ferromagnetic particles (this can be the flow of gases, such as air, mixed with ferromagnetic particles), moves through the pipe.In a constant magnetic field generated by the magnetic system 3, the ferromagnetic particles will move along the magnetic force lines (magnetic field) and to accumulate in the gap at the junction of the pipe and fill it. Thus, after some time in the gap formed a dense layer 4 made of ferromagnetic particles. The density of the magnetic flux of the permanent magnetic field of the connection pipes as filling the gap of the ferromagnetic particles is changed. This leads to a change in the electrical resistance of the protection layer 4 and allows to control the degree of gap ferromagnetic particles
Then the current in the magnetic system change on the AC. Now the magnetic system acts as inducer.Under the action of an alternating magnetic field is induction heating of ferromagnetic particles and simultaneously surface the Xia filler material, filling the welding together with the molten material adjacent pipes and connecting the parts to be welded.Gap ferromagnetic particles in this way is quicker than during injection of the adhesive mass by mechanical means. In addition, if necessary, the pipes can be connected by a single stream of ferromagnetic particles in several places at the same time.It is essential that the environment itself (the layer of ferromagnetic particles) is an intermediate body when connecting pipes. Ferromagnetic particles themselves are compacted, they also perform the function of the heater pipe connections.Thus, the invention improves the performance of the method of connecting pipes. The method of connecting pipes, consisting in the performance of operations on their alignment and installation in the seam zone, characterized in that the joint area create a constant magnetic field in the pipe form a directed flow of ferromagnetic particles, the gap at the interface of fill ferromagnetic particles, and are subjected to induction heating.
SUBSTANCE: outer surface of the pipe ends is provided with ring grooves spaced by ring projections. The ends of the coupling are provided with ring grooves. The ring grooves in the pipes receive sealing rings. The pipe ends house inserts which seal the faces of pipes from the space of pipeline. The ring grooves, projections of pipes, and ring grooves in the coupling provide a locking joint.
EFFECT: enhanced strength of coupling.
FIELD: non-disconnectible pipe joints.
SUBSTANCE: pipe is provided with coupling members at its ends. The coupling members are hermetically sealed, overlap the axis and form coaxial ring space near the free end. The length of the wall of the coupling members exceeds the length of the zone of destructive heating of covering during welding. The minimum thickness of the coupling member wall is determined from the formula SCM=STRTDM/RCMDT, where ST and SCM are the thickness of pipe and coupling member, DT and DM are the outer diameter of pipe and coupling member, and RT and RCM are the limiting yield of materials of pipe and coupling member, respectively. The section of outer surface of the pipe adjacent to the face, inner diameter of the coupling member, and the length of ring space allow receiving the aligning unit to provide abutting the faces of coupling members for welding. The aligning unit is made of a bushing which receives the sealing rings for sealing the faces and outer surfaces of the pipe in the ring space.
EFFECT: enhanced operate reliability and service life.
19 cl, 3 dwg
FIELD: laying pipe lines; shipbuilding; heating systems.
SUBSTANCE: proposed method includes preliminary heating of metal to working soldering point over width of 2-5 cm. Welding rod placed in area of pipe connection is molten by flame of gas burner. In the course of heating and connecting the pipes, layer of flux is applied on connection zone and adjacent zone over width of 2 cm. Welding rod may be made from alloy containing copper, zinc, silicon, tin; diameter of welding rod is 1.5-5 mm. Working temperature of alloy is 880-890 C, tensile strength, up to 500 N/sq mm and relative elongation, up to 20%.
EFFECT: reliable corrosion protection.
FIELD: construction engineering; erection of pipe lines assembled from cast iron pipes.
SUBSTANCE: proposed pipe line unit includes two pipes with sleeves fitted on their ends; sleeves are welded to pipes. Pipes are manufactured from high-strength cast iron. Specification contains data on ratio of sleeve length and thickness of its wall to diameter of pipe. Members of proposed pipe line unit may be made from high-strength cast iron containing globular graphite; welded seams may be made by nickel-containing alloy or high-strength cast iron.
EFFECT: enhanced reliability of pipe line.
6 cl, 1 dwg