Pipe line unit

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

 

The invention relates to the construction and can be used in the piping when connecting iron pipes between them.

Closest to the claimed is the site of the pipeline, including two tubes, the ends of which is mounted a clutch connected to the end sides welded to each pipe (GOST 16037-80 connection N4). Pipe and coupling are made of steel.

A disadvantage of the known technical solution is low, the resistance of the host pipe in the manufacture of pipes of ductile cast iron.

The technical result is an increase durability and reliability of pipeline node containing ductile iron pipes.

The technical result is achieved by the fact that the site of the pipeline, including two tubes, the ends of which is mounted a clutch connected to the end sides welded to each tube, the tube is made of high-strength cast iron, and the length of the sleeve is 0.10-1,22 from a nominal diameter of pipe and wall thickness of the coupling is 0.8 to 3.5 from the pipe wall thickness. The coupling may be made of ductile iron, and both the coupling and the pipe can be made from high-strength nodular cast iron. Welds can be made of Nickel alloy or cast iron, including high strength.

It is known that cast iron has a higher cf is the ranking, with steel, the corrosion resistance. Therefore, the application node in the pipeline pipes made of cast iron, increases the resistance of such a node when using it in water, steam, gas, oil pipelines. However, welded iron pipe compared to steel pipe (pipe butt) has an increased tendency to fracture at the connection pipes between them. Proposed construction site of the pipeline, which consists in joining cast iron pipe through the sleeve, prevents premature destruction of the host pipe provided the dimensions of the coupling in the claimed range.

The pipelines at the stage of manufacture during installation and during operation (especially pipelines of heating) have both bending and tensile loads. To prevent the destruction of the host pipe, which pipe is made of high-strength cast iron, while increasing its durability and reliability of the length of the sleeve should be of 0.10-1,22 from a nominal diameter of pipe and wall thickness of the coupling should be 0,8-3,5 from the pipe wall thickness. At smaller length and wall thickness of the coupling stiffness and strength become insufficient, and this clutch will quickly disintegrate in the center, and end sides in the area of the weld seams. If the values of the length and thickness of the coupling Bud is t to exceed the upper limits, then the node becomes cumbersome additional excess weight will create new tensions in the host, which reduces its reliability and reduces the resistance.

The coupling can be performed in both steel and cast iron, and further improve the quality, durability and longevity of the host pipe able to achieve in that case, if the clutch is made of high-strength cast iron, and the best option if the coupling and pipes made from high-strength nodular cast iron. Welds can be made of Nickel alloy or cast iron, including high strength.

The invention is illustrated in the drawing, which shows the site of the pipeline, where 1 and 2 are connected pipe, 3 - coupling, 4 and 5 - welded joints In length of the sleeve, the leg of the weld, S - thickness of pipe wall, h is the wall thickness of the coupling.

The following is an example of the execution pipeline node.

The site of the pipeline consists of two pipes of ductile cast iron with spherical graphite with a nominal diameter of pipe Dy=100 mm, wall thickness of the tube is S=6 mm Coupling, attached to the ends of pipes made from high-strength nodular cast iron. Length of the sleeve is In=0,5·Dy=50 mm, wall Thickness of the coupling is h=1,25·S=7,5 mm welds connecting end sides of the coupling with each pipe, made of alloy with a Nickel content of 80% by mass is.

Technical and economic advantage of the invention is to improve the quality, durability and reliability of pipeline node containing ductile iron pipes used in water, gas, steam and oil pipelines.

1. The site of the pipeline, including two tubes, the ends of which is mounted a clutch connected to the end sides welded to each tube, wherein the tube is made of high-strength cast iron, and the length of the sleeve is 0.10÷1,22 from a nominal diameter of pipe and wall thickness of the coupling is 0.8÷3,5 from the wall thickness of the pipe.

2. The node according to claim 1, characterized in that the clutch is made of high-strength cast iron.

3. The node according to any one of claims 1 and 2, characterized in that the pipe and coupling are made from high-strength nodular cast iron.

4. The node according to any one of claims 1 to 3, characterized in that the welds are made from Nickel alloy.

5. The node according to any one of claims 1 to 3, characterized in that the welds made of cast iron.

6. The node according to claim 5, characterized in that the welds made of ductile iron.



 

Same patents:

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.

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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: construction.

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EFFECT: enhanced strength of coupling.

2 dwg

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FIELD: construction.

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.

2 dwg

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.

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EFFECT: reliable corrosion protection.

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Pipe line unit // 2249147

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

FIELD: mechanical engineering.

SUBSTANCE: method comprises winding prepreg on the mandrel and setting metallic branch pipes at the ends of the fiber glass pipe. The prepreg is wound on the mandrel at a temperature that provides the binder to be flexible. The end bosses are made on the fiber glass pipe by winding the same prepreg heated up to a temperature allowing the binder to be flexible and a diameter equal to the outer diameter of the section of metallic branch pipes to be wound. The mandrel with the prepreg is then cooled down to the ambient temperature. The outer surface of the end bosses is provided with ring grooves, and the glue is applied on the outer and inner surfaces of the sections of the metallic branch pipes to be wound. The metallic branch pipes are pressed on the end bosses.

EFFECT: enhanced reliability.

8 dwg

FIELD: non-disconnectible pipe joints.

SUBSTANCE: device comprises sleeve-like rotary-symmetrical main member that has at least one cylindrical internal space which is provided with gearing means and receives the end of the pipe. The gearing means is pressed radially into the surface of the pipe end under the action on the outer surface of the main member of the squeezing tool. The squeezing tool is composed of pressing ring and pair of squeezing rings arranged coaxially to it and provides exclusively radial displacement.

EFFECT: enhanced reliability of joint.

28 cl

FIELD: pipeline transport.

SUBSTANCE: method comprises winding belt made of fiber filler provided with a binder on the ends of pipes to be joined, radial compressing by means of air-tight dies, and polymerizing the belt. After compressing, the belt may be heated. The fiber material may be wound together with the grid made of a conducting material. After winding, the grid is energized for heating the belt throughout the bulk. The fiber filler may be made of fiber glass fabric. Before winding the belt, the ends of the pipes may be provided with the belt made of a flexible sealing material. The device comprises perforated dies which are mounted coaxially with respect to the ends of the pipes to be joined on the belt and are tightened by means of bolts or power cylinders to provide radial pressure.

EFFECT: enhanced reliability.

13 cl, 14 dwg

FIELD: pipe line transport; erection of pipe lines provided with internal anti-corrosion coats.

SUBSTANCE: proposed method includes calibration of ends of pipes over internal diameter to maximum size; then, anti-corrosive coat is applied to internal surfaces of pipes and bushes made from anti-corrosive steel are mounted inside ends of pipe overlapping part of coat; said bushes have sealing layers on their external surfaces. Bushes are secured by flaring with the aid of mandrel till contact with internal surfaces of pipes at negative allowance; pipes are connected by butt welding according to procedure of welding double-layer pipes with internal layer made from corrosion-resistant steel. Sealing layer may be located in circular bore which is open at internal end face of bush or in immediate proximity; it may be applied in form of continuous coat over entire external surface of bush but for zone of thermal effect on outer end arising in the course of welding.

EFFECT: facilitated procedure; low cost of procedure.

5 cl, 4 dwg

FIELD: mechanical engineering; making and repair of permanent joints of steel and polymeric pipes.

SUBSTANCE: proposed permanent joint of pipes includes steel pipe and polymeric pipe with strengthener enclosing working part of steel pipe by its working part, and metal sleeve. Steel pipe is made in form of length of pipe with welded-to mounting ring. End face part of ring, inner surface of length of steel pipe and surface of its working part are provided with polymeric coating. Sleeve is welded to mounting ring. Working part of polymeric pipe with strengthener in form of longitudinal members uniformly spaced over circumference and spiral members wound on with preset putch and welded in places of intersection by tap welding, it welded to polymeric coating of working part of steel pipe section which, in its turn, is welded to steel pipe. Description of method of connection of pipes is provided.

EFFECT: improved sealing and increased reliability of joint.

3 cl

FIELD: construction.

SUBSTANCE: method comprises preparing fiber glass pipes, assembling the pipes, and heating the section near the pipe joint. The end of the first pipe is heated up to 100 - 120°C. The end is expanded with a special tool to provide the socket, and the socket is cooled down to 50°C which provides the end of the second pipe to be set into the socket. The expansion tool is removed, the end of the second pipe is provided with an epoxy adhesive composition and it is set into the socket, and the joint section is heated up to 100 - 120°C.

EFFECT: simplified pipe joining.

3 dwg

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