A method of manufacturing a pipe with an internal protective coating

 

(57) Abstract:

The invention relates to the construction and used in the construction and repair of pipelines transporting chemically aggressive environment. Form and fix a cylindrical liners made of corrosion-resistant metal on the inside of the pipe ends. The liners are made of multilayer wound or formed from separate rings inside of the pipe ends of thin-walled rolled corrosion-resistant metal and connect the first layer of winding or the first ring with the inner surface of the pipe ends, and the subsequent layers are wound or subsequent rings by gluing, soldering and welding together. The inner ends of the liners make speed due to the displacement of the layers relative to each other and the free ends of the layers cause the protective coating. Layers of liners and connect the anticorrosive adhesive dielectric material or adhesive anticorrosion protective material, and the outer ends of the liners pinch rings made of corrosion-resistant metal. Improves the reliability of welded joints of pipelines. 3 C.p. f-crystals, 2 Il.

The invention relates to methods for producing pipes with internal, ransporters chemically aggressive environment.

Currently an important issue in the construction of pipelines with an internal protective coating is the connection of pipes by welding, but this requires a full save of the corrosion-resistant coating adjacent to the place of welding. In this regard, developed various designs of pipes with internal anti-corrosion coating that connect them by a welding method.

There is a method of applying a protective coating on the inner surface of the tube (U.S. Pat. 2137976 RF MPK F 16 L 58/08, 1999). According to this method inside end of the tube is placed folded in shell corrosion-resistant metal sheets having internal flanging. Create from them a nozzle with an inner flange connection arc welding the longitudinal edges of the tape along the length of their contact with the metal of the pipe and the length of the flanging equal to the thickness of the coating, and then Nazarene side flanges of the pipes razbortovyvayut beyond the ends of the coating. Formed nozzles are additionally secured to the inner surface of the pipe metal spot welded or welded rivets.

The disadvantage of this method is that Chennai from the aggressive environment of the pipe surface under the area of the nozzles.

For the prototype accepted pipe with an internal protective coating and method of its manufacture (U.S. Pat. 2130147 RF MPK F 16 L 13/0, 9/00, 1999). The prototype, that is a pipe with an internal protective coating includes a cylindrical liner made from a strip of corrosion-resistant metal. Within the cylindrical liner from the pipe end has a second cylindrical bearing from a strip of corrosion-resistant metal. First create inside liner tube end welding of the longitudinal seam corrosion with simultaneous fixation of the same welded to the inner surface of the pipe. The second cylindrical liner creates on the inner surface of the first liner by welding longitudinal corrosion-resistant weld the same direction and the projection with the seam of the first cylindrical liner.

The disadvantage of the prototype is that in case of damage to the body strip material of the first liner aggressive environment will have contact with the internal surface of the pipe that will eventually lead to accelerated corrosion processes.

The objective of the invention is to increase productivity in the manufacture of pipes with internal protective coating and reliability anticorrosion, the manufacture of pipes with internal protective coating includes fabrication and fixing tsilindricheskikh liners made of corrosion-resistant metal on the inside of the pipe ends. The liners are made of multilayer wound or manufacture of the individual rings within the pipe ends of thin-walled rolled corrosion-resistant metal and a compound of the first layer of winding or the first ring with the inner surface of the pipe ends, and subsequent layers of winding or subsequent rings interconnected by gluing, soldering or welding. What's new is that the inner ends of the liners do step by cylindrical rings liners in different widths and the free ends of the layers cause the protective coating. Multilayer liners are made of tape wound by applying tape having a variable length width. New is also the fact that the layers of liners and connect the anticorrosive adhesive dielectric material, and the outer ends of the liners pinch rings made of corrosion-resistant metal. Layers of liners also are connected with adhesive anti-corrosive protective material.

Analysis of the known similar solutions allows you to make warstwie of the proposed method the criterion of "substantial differences".

A method of manufacturing a pipe with an internal protective coating is as follows.

Preparation (cleaning, degreasing) of the inner surface of the pipe end 1 to the length of the liners 2 (Fig.1). From thin rolled corrosion-resistant metal made of multilayer winding insert 2 or from a separate rings inside end of the tube 1. Subsequent layers of winding or subsequent separate ring liners 2 are connected by gluing, soldering, resistance welding, or a combination. When connecting pads by bonding, made of separate rings or multi-layer wrapped with the inner surface of the pipe ends and between them, on all contact surfaces pre-applied adhesive material. In the proposed method, as the adhesive material used: a) adhesive anticorrosion dielectric material which is adhesive on metal with a dielectric filler, such as finely ground (powdered) plastic; (b) adhesive anticorrosion protective material which is adhesive on metal with a sacrificial filler, such as powdered aluminum or zinc. When connecting liner made of multilayer nalee roll is inserted into the pipe end and the longitudinal edge of the blank liner, that is, the dense collapsed roll, soldered or connected by resistance welding to the inner surface of the pipe end. As the expander roll is a longitudinal soldering or welding of thin-walled sheet with the inner surface of the pipe, and after the first coil - layer winding a multi-layer liner. To enhance corrosion protection inner ends of the liners 2 do step by cylindrical rings liners of different width. When assembling the outer ends of the inserts are placed in the cavity of the pipe end, the inner ends of the rings are graded in order of decreasing length liners, and the first one in the pipe enter the ring overall length, and the last is the smallest length. In the manufacture of the liner from the tape, having a variable length, width wound, the latter begins with the wide end of the tape. Next on the internal surface of the pipe is coated with the protective coating, which is also applied to the free ends of the layers of liners 2. Before applying to the inside of the pipe anticorrosion coating the ends of the liners 2 pinch rings 4 of corrosion-resistant metal (Fig.2)

Produced by the proposed method pipe internal corrosion PM coating on the proposed method improves the performance in the manufacture of pipes and increases the reliability of the corrosion protection zone of the weld at the connection of pipes in pipelines.

Sources of information

1. Pat. 2137976 RF MPK F 16 L 58/08, the Method of applying a corrosion-resistant coating on the internal surface of the pipe/C. M. Yuganov, N. M. Yuganov, M. I. Starkov (RF). - 98107028/06; claimed 09.04.98; publ. 20.09.99. Bull. 26.

2. Pat. 2130147 RF MPK F 16 L 13/00, 9/00. Pipe with an internal protective coating and method of its manufacture /C. M. Yuganov, M. I. Starkov, C. L. Chagaev. L. I. Volkov (Russia). - 97101225/06; claimed 01.07.97; publ. 10.05.99. Bull. 13.

1. A method of manufacturing a pipe with an internal corrosion-resistant coating, comprising the manufacture of liners multilayer wound or from a separate rings inside of the pipe ends of thin-walled rolled corrosion-resistant metal and the compound of the first layer of winding or the first ring with the inner surface of the pipe ends, and subsequent layers of winding or subsequent rings interconnected by gluing, soldering, welding, or a combination, characterized in that the inner ends of the liners do manual and on the free ends of the layers cause the protective coating.

2. The method according to p. 1, characterized in that the inner ends of the liners make speed due to the displacement of the layers relative to each other and the free ends of the layers cause the protective coating.

4. The method according to PP. 1-3, characterized in that the layers of liners are connected with adhesive anti-corrosive protective material.

 

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