Nowadays, with the continuous development of society, the output of oil field mining has increased, and the tools used in mining technology have become more and more abundant. In order to meet the increasing oil production, there are more and more oil transportation tools. Commonly used casing and tubing ，the pup joint industry is also developing continuously. In oil production, the use of Pup joints is very important for oil. Generally speaking, Pup joint is a very important industrial pipe connection accessory and is a commonly used type of spare parts in industrial pipeline connection. There are many types, the most common ones are threaded puff joints, which are divided into double-ended external wires, single-ended external wires, and flat-ended external wires. In addition, there are also flange-connected puppy joints. Pup joints are divided into tubing short joints and casing pup joints. This article will detail some types of pup joint.
1. Pup joints are classified according to their shapes:
Pup joints are divided into five types according to their shapes:
(a) Change from externally thickened to non-thickened Pup joint--the specifications of both ends are the same. One end of the oil pipe Pup joint is connected to the externally thickened oil pipe, and the other end is connected to the non-thickened oil pipe or special threaded oil pipe;
(b) Externally thickened and variable diameter pup joint--the specifications of the two ends are different. One end of the oil pipe pup joint is connected to the large-size externally thickened oil pipe, and the other end is connected to the small-size oil pipe;
(c) Externally thickened to externally thickened pup joint--the specifications of both ends are the same, one end of the pup joint is connected to the externally thickened oil pipe, and the other end is connected to the externally thickened oil pipe of the same specification；
(d) Same diameter pup joint-the specifications of both ends are the same. One end of the oil pipe pup joint is connected to an unthickened oil pipe or a special threaded oil pipe, and the other end is connected to an unthickened oil pipe or a special threaded oil pipe；
(e) Unthickened variable diameter pump joint--the specifications of the two ends are different. One end of the oil pipe pump joint is connected to the large-size unthickened oil pipe, and the other end is connected to the small-size oil pipe.
2. Pup joints are classified by function:
Pup joints are divided into three types according to their functions；
(a) Double male pup joint: Both ends are externally threaded, externally thickened to non-thickened pup joint, externally thickened to variable-diameter puppy joint, externally thickened to externally thickened pup joint, same-diameter pup joint and non-thickened pup joint. Any kind of thickened and variable diameter pup joint；
(b) Convert the pup joint: one end is externally threaded, the other end is internally threaded, externally thickened to non-thickened pup joint, externally thickened to variable diameter pup joint, externally thickened to externally thickened pup joint, same diameter pup joint And the coupling is screwed on the non-thickened reducing puppy joint；
(c) Adjust the pup joint: the length is variable and is designed according to project needs. One end is externally threaded and the other end is internally threaded. The external thickening becomes a non-thickening pup joint, the external thickening changes the diameter of the pup joint, and the external thickening becomes external. Couplings are screwed on thick Pup joints, same-diameter Pup joints and non-thickened Pup joints with variable diameters.
3. Classification according to materials:
Pup joints can be divided into two categories: metal pup joints and non-metal pup joints.
Metal pup joints are usually made of materials such as stainless steel, carbon steel or cast iron. They have high strength and corrosion resistance and are suitable for high pressure and high temperature environments.
Non-metal pup joints are mainly made of rubber, plastic or composite materials. They have good sealing performance and chemical corrosion resistance and are suitable for general industrial and civil fields.
4. Classification according to connection method:
Oil pipe pop joints can be divided into three types: threaded pup joint, flanged pup joint and clamps.
The threaded pup joint is the most common type. It connects oil pipes through threads. It is simple and convenient and is suitable for low pressure and general working conditions.
The flange pop joint connects oil pipes through flanges, has high sealing performance and load-bearing capacity, and is suitable for high-pressure and high-temperature environments. The clamp is a type of coupling that is connected by clamping the oil pipe. It has the characteristics of quick and detachable, and is suitable for temporary connection and maintenance.
In addition, depending on the diameter of the connecting pipe, the pup joint can also be divided into different specifications and sizes. Common puppy joint specifications include 1/2 inch, 3/4 inch, 1 inch, etc. You can choose the appropriate size according to actual needs.
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