CN205226712U - Take compound pipe of mechanical type of connecting hole - Google Patents

Abstract

The utility model discloses a mechanical composite pipe with connecting holes, which comprises a carbon steel base pipe and a corrosion-resistant alloy liner sleeved in the carbon steel base pipe. The composite pipe is provided with a connecting hole. The mechanical composite pipe with connection holes of the utility model has a structure of two layers of metal inside and outside. The carbon steel base pipe is relatively thick, and the corrosion-resistant alloy liner is thin and has connection holes. The double metal layer has a strong tight fit The base pipe bears pressure, the liner pipe is corrosion-resistant, and the connection holes can be connected to branch pipes, various branch pipe joints and instrument joints. It is a mechanical bimetallic composite pipe with high cost performance.

Description

A mechanical composite pipe with connecting holes

technical field

The utility model relates to a composite pipe and the technical field of preparation, in particular to a mechanical composite pipe with connecting holes.

Background technique

In recent years, mechanical bimetallic composite pipes have been widely used in petroleum and chemical industries due to their excellent performance such as high pressure resistance and corrosion resistance. Mechanical bimetallic composite pipes are mainly used in process pipeline projects outside oil and gas stations. However, in the entire process pipeline, in order to merge or divert the transported media, it is necessary to connect branch pipes. In order to monitor the process pipeline, it is necessary to install some However, due to the special structure of the mechanical bimetallic composite pipe, it is not easy to open holes, weld branch pipe joints or branch pipes, and weld instrument joints on site, which makes it impossible to connect branch pipes and install instruments on the mechanical bimetallic composite pipe, which restricts the mechanical type. Application of bimetal composite pipe in process pipeline engineering in oil and gas stations. Originally, in the application of mechanical composite pipes, a section of corrosion-resistant alloy pipe or metallurgical composite pipe was basically pre-connected, and holes were directly opened on the corrosion-resistant alloy pipe or metallurgical composite pipe to weld branch pipes and instrument joints. The problem that existed in this way was the price In addition, due to the different materials, their mechanical properties are also limited, and the safety factor of the pipeline is reduced.

Utility model content

The purpose of this utility model is to provide a mechanical composite pipe with connecting holes, which solves the problem that the existing mechanical bimetallic composite pipe is difficult to open holes, weld branch pipe joints or branch pipes, and weld instrument joints, resulting in mechanical bimetal composite pipes. The problem that the pipe cannot be connected to the branch pipe and the instrument can not be installed.

The technical solution adopted by the utility model is a mechanical composite pipe with connection holes, which includes a carbon steel base pipe and a corrosion-resistant alloy liner sleeved in the carbon steel base pipe, and the composite pipe is provided with a connection hole.

The utility model is also characterized in that,

There are one or more connection holes, and the distance between two adjacent connection holes is L≥200mm.

Sealing welding or surfacing welding at the gap between the carbon steel base pipe and the corrosion-resistant alloy liner at the connection hole.

The connection holes include the liner connection holes on the corrosion-resistant alloy liner and the base pipe holes on the carbon steel base pipe, and the positions of the liner connection holes correspond to the positions of the base pipe holes.

The size d2 of the liner connection hole matches the size of the branch pipe to be connected; the size d1 of the base pipe hole is d2+5mm≥d1≥d2+4mm, and the groove angle α is 60°≥α≥40°.

The beneficial effects of the utility model are that the mechanical composite pipe with connection holes of the utility model has a structure of two layers of metal inside and outside, the carbon steel base pipe is thicker, the corrosion-resistant alloy liner is thinner, and has connection holes. The metal layer has a strong fit, the base pipe bears pressure, the liner pipe is corrosion-resistant, and the connection hole can connect branch pipes, various branch pipe joints and instrument joints. It is a mechanical bimetallic composite pipe with high cost performance.

Description of drawings

Figure 1 is a structural diagram of a mechanical composite pipe with one connection hole and the connection hole is surfacing;

Figure 2 is a structural diagram of a mechanical composite pipe with one connection hole and the connection hole is sealed and welded;

Fig. 3 is a structural diagram of a mechanical composite pipe with 2 connecting holes;

Fig. 4 is a structural diagram of the surfacing process of the connection hole;

Fig. 5 is a structural diagram of the connection hole being sealed and welded;

Fig. 6 is a welded structure diagram of the direct connection branch pipe of the composite pipe of the present invention;

Fig. 7 is a welding structure diagram of the composite pipe of the present invention connecting the branch pipe through the branch pipe platform.

In the figure, 1. carbon steel base pipe, 2. corrosion-resistant alloy liner, 3. connection hole, 3-1 base pipe hole, 3-2. liner connection hole, 4. connection hole surfacing weld, 5. connection Hole sealing weld, 6. branch pipe, 7. connection weld of composite pipe and branch pipe, 8. connection weld seam of branch pipe and branch pipe platform, 9. branch pipe platform, 10. connection weld seam of branch pipe platform and composite pipe.

detailed description

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The mechanical composite pipe with connecting holes of the present invention, referring to Figures 1, 2 and 3, includes a carbon steel base pipe 1 and a corrosion-resistant alloy liner 2 sleeved in the carbon steel base pipe 1, and the composite pipe is provided with a connecting pipe. Hole 3. The corrosion-resistant alloy liner 2 is made of stainless steel, titanium alloy or copper alloy.

One or more connection holes 3 are provided, and the distance between two adjacent connection holes 3 is greater than or equal to 200 mm.

As shown in Figure 4 or Figure 5, the gap between the carbon steel base pipe 1 and the corrosion-resistant alloy liner 2 at the connection hole 3 is sealed or surfacing welded. The connection hole 3 includes the liner connection hole 3-2 provided on the corrosion-resistant alloy liner 2 and the base pipe hole 3-1 provided on the carbon steel base pipe 1. The position of the liner connection hole 3-2 is the same as that of the base pipe hole 3. The position of -1 corresponds to that. The size d2 of the liner connection hole 3-2 matches the size of the branch pipe to be connected; the size d1 of the base pipe hole 3-1 is d2+5mm≥d1≥d2+4mm, and the groove angle α is 60°≥α≥40 °.

The mechanical composite pipe with connection holes of the utility model has a structure of two layers of metal inside and outside. The carbon steel base pipe 1 is relatively thick, and the corrosion-resistant alloy liner pipe 2 is relatively thin, and has connection holes 3. The bimetal layer has considerable strength. The tight fit, the base pipe bears pressure, the liner pipe is corrosion-resistant, and the connecting hole 3 can connect branch pipes, various branch pipe joints and instrument joints. It is a mechanical bimetallic composite pipe with high cost performance.

The mechanical composite pipe with connection holes of the utility model is prepared in the following manner:

Step 1, firstly open the base pipe hole 3-1 on the carbon steel base pipe 1, then sandblast the inner surface of the carbon steel base pipe 1, and clean the outer surface of the corrosion-resistant alloy liner 2; the cleaned corrosion alloy liner The pipe 2 is set in the carbon steel base pipe 1, and the corrosion-resistant alloy liner 2 is pressurized by hydraulic pressure or air pressure. The lining fits tightly together;

Step 2: Carry out sealing welding at the gap between the carbon steel base pipe 1 and the corrosion-resistant alloy liner 2 at the base pipe hole 3-1 to form a connecting hole sealing weld 5, or surfacing welding to form a connecting hole surfacing weld 4, welding materials For dissimilar metal welding consumables (dissimilar metal welding consumables are ER309LMo, ER316L, ERNiCrMo-3, ER2209 or ER385 welding wire), the sealing weld 5 of the connection hole or the surfacing weld 4 of the connection hole shall be inspected for coloring. A liner connection hole 3-2 is provided on the corroded alloy liner 2, and the center of the liner connection hole 3-2 corresponds to the center of the base pipe hole 3-1.

The preparation of the mechanical composite pipe with connection holes of the utility model requires two openings, the first opening on the base layer, and the second opening on the lining layer, and the two openings can realize the corrosion-resistant alloy liner 2 The hole size is smaller than the carbon steel base pipe 1 hole size, and sealing welding and surfacing welding can be realized at the hole, which ensures the corrosion resistance of the hole.

There are two connection modes for the connection between the mechanical composite pipe with connection holes and the branch pipe of the utility model:

The first connection method is the connection of branch pipes 6 without reinforced welding structure, as shown in Figure 6, the connection method is to directly weld the branch pipes 6 at the connection hole 3 to form the connection weld 7 between the composite pipe and the branch pipes. The method is suitable for low and medium pressure piping systems, and the diameter of the branch pipe is small.

The second connection method is the branch pipe 6 connection with reinforced welding structure, as shown in Figure 7, the connection method is: in order to improve the pressure bearing capacity of the pipeline, first weld the branch pipe platform 8 at the connection hole 3 to form the branch pipe platform and composite The connection weld 10 of the pipe, and then connect the branch pipe 6 through the branch pipe platform 9 to form the connection weld seam between the branch pipe and the branch pipe platform. This connection method is suitable for medium and high pressure piping systems.

Claims (5)

1. the mechanical type composite pipe with attachment hole, is characterized in that, comprise carbon steel base tube (1) and be enclosed within the corrosion resisting alloy bushing pipe (2) in described carbon steel base tube (1), this composite pipe is provided with attachment hole (3).

2. the mechanical type composite pipe of band attachment hole according to claim 1, is characterized in that, described attachment hole (3) is provided with one or more, and the spacing L >=200mm of adjacent two attachment holes (3).

3. the mechanical type composite pipe of band attachment hole according to claim 1, is characterized in that, described attachment hole (3) place carbon steel base tube (1) and corrosion resisting alloy bushing pipe (2) gap location seal welding or built-up welding welding.

4. the mechanical type composite pipe of the band attachment hole according to claim 1,2 or 3, it is characterized in that, described attachment hole comprises the base tube hole (3-1) that bushing pipe attachment hole (3-2) and described carbon steel base tube (1) that described corrosion resisting alloy bushing pipe (2) is offered are offered, and the position of described bushing pipe attachment hole (3-2) is corresponding with the position of described base tube hole (3-1).

5. the mechanical type composite pipe of band attachment hole according to claim 4, is characterized in that, the size d2 of described bushing pipe attachment hole (3-2) matches with needing the manifold size be connected; The size d1 of described base tube hole (3-1) is d2+5mm >=d1 >=d2+4mm, groove angle α is 60 ° >=α >=40 °.