Pipeline failure and maintenance-1

Release time:

2024-03-25

What are the common repair tools for pipeline maintenance? Answer: the tools for repairing pipes include welding tools, lifting tools, installation testing tools, cutting tools, tapping tools, beveling machines and other special tools.

(1) The welding of welding torch gas welding adopts gas welding torch. There are three types of welding torch: large, medium and small. According to the gas consumption per hour, each type has 7 welding nozzles. During welding, the appropriate welding nozzle is generally selected according to the thickness of the workpiece.

Welding tongs shall be used for welding of electric welding, and welding rod shall be clamped by welding tongs during welding.

Nitrogen arc welding is commonly used in water-cooled argon arc welding. The welding handle is mainly composed of gun body, nozzle, electrode clamping device, nitrogen input pipe, cooling water pipe, etc. its structure is simple and light.

(2) Welding machine the main tool of electrode arc welding is electric welding machine, which includes alternating current welding machine, direct current welding machine and welding rectifier. There are bx1-300, bx-500 AC welding machine, ax-320, ax-165 DC welding machine, ZXG and zxg3-150 welding rectifier. AC welding machines have no polarity. DC welding machine has polarity, the workpiece is connected with positive pole, and the electrode is connected with negative pole, which is called positive connection; otherwise, it is called reverse connection. Different kinds of electrodes require different welding methods. In addition, there are also inverter welding machines, which have the advantages of AC and DC welding machines at the same time, the technology is relatively new, especially suitable for site use.

(3) Beveling machine beveling machine is used to process pipe end beveling tools, according to whether the pipe rotation can be divided into two categories. This paper only introduces the use method of beveling machine which does not rotate the tube and the cutter rotates and cuts around the nozzle. First, draw the line of the pipe according to the required size, send it to the upper bracket of the beveling machine, and clamp it with a chuck; grind the cutter according to the angle of the processed groove, install it on the tool holder, and adjust the position of the cutter at the same time; start the motor, adjust the back draft of the cutter through the feed nut, and then the required groove can be processed.

How to check and diagnose the pipeline?

A: Although a lot of manpower and material resources have been invested in the research of pipeline protection technology in China, it is not perfect. Oil, gas and water pipelines are damaged and leaked frequently, which not only causes the loss of oil, gas and water, but also sometimes causes fire and explosion accidents, which brings a direct threat to people's lives and the safety of public facilities. Therefore, from the safety point of view, through the inspection and diagnosis of pipelines, first, the accident density of leakage and damage can be reduced. First, even if leakage and damage accidents occur, the degree of damage can be minimized due to early detection. The main inspection items of the pipeline include: internal and external pipe corrosion inspection, coating and coating inspection, and pipeline leakage inspection. The following focuses on the inspection technology of the internal surface and coating defects of the pipeline.