SSAW Pipe

    1. The project cost is low.     Double-control directly buried heating pipelines can generally be constructed at a lower cost than trench laying projects.     2. Low heat loss and energy saving.     Because the direct buried insulation pipe uses polyurethane rigid foam plastic as the insulation material, its thermal conductivity is much lower than that of other commonly used pipe insulation materials in the past.     3. Anti-corrosion, good insulation performance and long service life.     Because the rigid polyurethane foam insulation layer is tightly adhered to the outer skin of the steel pipe , it prevents the infiltration of air and water, and can play a good anti-corrosive effect. And the outer polyethylene shell or glass fiber reinforced plastic shell has good corrosion resistance, insulation and mechanical properties.     4. It occupies less land, has faster construction, and is beneficial to en...

    1. There are two types of mechanical cutting: external installation and internal installation. It uses the principle of turning tool to cut the pipe mouth and bevel processing. The single machine has a large span, can be processed with large thickness, less waste, no pollution, no high temperature during the processing, does not affect the pipe material, and is beneficial to welding. Water cutting uses high-pressure pumps and silicon carbide to process pipes together. The cut is clean and the processing span is large, but its efficiency is low and the processing thickness is severely restricted.     2. Oxygen acetylene flame cutting, by adjusting the oxygen valve and acetylene valve, the mixing ratio of oxygen and acetylene can be changed to obtain three different flames: neutral flame, oxidation flame and carbonized flame.     3. Ion cutting, plasma cutting and different working gases can cut various metals that are difficult to cut with oxygen, es...

    Oil casing drilling is also called percussion drilling. The steel wire rope is used to send the drill bit to the bottom of the well, and the beam mechanism is driven by the driving force to make one end of the beam move up and down, and the steel wire rope and the drill bit are impacted up and down, so that the rock is broken. The drilling speed of the Dayton drill is generally relatively slow, and the efficiency is very low, which can not adapt to the increasing depth of the well and the complicated formation drilling requirements, so it has been gradually replaced by rotary drilling. However, its equipment is relatively simple, its cost is low, and it will not pollute the oil layer. It can be used in some shallow low-pressure oil and gas wells and lost wells. Downhole power drilling is the use of downhole power drilling tools to drive the drill bit to break the rock. The drill string does not rotate during drilling, its wear is relatively small, and the service life is l...

    1. Welding process     From the welding process, the welding method of galvanized spiral welded pipe and galvanized straight seam steel pipe are the same, but the straight seam welded pipe inevitably has many T-shaped welds, so the occurrence of welding defects is also greatly improved. Moreover, the welding residual stress at the defect is large, which increases the possibility of cracks.     2. Static blasting strength     Through the relevant comparative tests, it is verified that the yield pressure and burst pressure of the spiral welded pipe and the straight welded pipe are basically consistent with the measured value and the theoretical value, and the deviation is close. But whether it is yield pressure or burst pressure, spiral welded pipe is lower than straight welded pipe.     3. Toughness and fatigue strength     The trend of pipeline development is large diameter and high strength. According to the mea...

    The solution treatment has three points.     1. Make the structure and composition of the steel pipe uniform, which is especially important for the raw materials, because the rolling temperature and cooling rate of each section of the hot-rolled wire are different, resulting in an inconsistent organizational structure.     2. Eliminate work hardening in order to facilitate continued cold work.     Through the solution treatment, the twisted lattice is restored, the elongated and broken grains are recrystallized, the internal stress is eliminated, the tensile strength of the steel pipe decreases, and the elongation increases.     3. Restore the inherent corrosion resistance of stainless steel.     The precipitation of carbides and lattice defects due to cold working reduce the corrosion resistance of stainless steel. After solution treatment, the corrosion resistance of the steel pipe is restored to its original st...

    Thick-walled seamless steel tube is a common type of thick-walled seamless steel tube. It is a special material of thick-walled steel pipe. For thick-walled seamless steel pipe , it is more important to protect the most basic use and play. More important performance. Thick-walled seamless steel pipe is an important material for seamless steel pipes. Its hardness is relatively large. Generally, it is difficult to master the cutting techniques and methods when cutting. In this way, thick-walled seamless steel pipes can be successfully cut. Can not hurt people. To safely cut thick-walled seamless steel tubes, the following operations are recommended.     1. Mechanical cutting.     Mechanical cutting adopts both external installation and internal installation. It uses the turning tool processing principle to cut off and bevel the nozzle. The single machine has a large span, can be processed with a large thickness, less waste, and has no pollution. The p...

    The oil layer casing is the production casing, and the tail pipe technology is only one kind of cementing technology. It is a method of hanging the casing on the upper casing only by the open hole section of the lower oil casing and the technical casing. For details, please refer to the following knowledge, please adopt if you are satisfied.     Petroleum casing is abbreviated as casing, which is a kind of petroleum pipe. The pipes used in petroleum are collectively called petroleum pipes. Petroleum pipes include finished oil casings, drill pipes, drill collars, couplings and short rods.     1. Classification and function of casing     The casing is a steel pipe that supports the walls of oil and gas wells. Each well will use several layers of casing according to different drilling depths and geological conditions. Cement is used to cement the casing after it goes down the well. It is different from tubing and drill pipe and cannot be re...

    The quality and performance of seamless steel pipes are determined according to needs. According to different needs, different element contents and types must be matched.     (1) Carbon: The higher the carbon content, the higher the rigidity, but the worse its plasticity and toughness.     (2) Sulfur: It is a harmful impurity in steel. When steel with high sulfur content is subjected to pressure processing at high temperature, it is easily brittle and is usually called hot brittleness.     (3) Phosphorus: It can significantly reduce the plasticity and toughness of steel, especially at low temperatures. This phenomenon is called cold brittleness. In high-quality steel, sulfur and phosphorus must be strictly controlled. However, from another aspect, the low carbon steel contains high sulfur and phosphorus, which can make it easy to cut, which is beneficial to improve the machinability of steel.     (4) Manganese: It can improv...

    Copper pipe is an important raw material for refrigeration equipment, which is mainly used for making heat ex-changers and connecting pipes and fittings. Refrigeration and air-conditioning welded pipe fittings are mostly copper (purple) pipes. Common types of solder are copper-phosphorus solder, silver-copper solder, and copper-zinc solder. According to the characteristics of the pipe material, the correct solder should be selected and operated skillfully to ensure the quality of the welding.     1. Welding of similar materials     (1) Brazing of copper and copper     You can choose phosphor copper solder or phosphor copper solder with low silver content, such as 2% or 5% silver-based solder. This type of solder is relatively cheap and has a good solution. It uses caulking and wetting processes and does not require flux.     (2) Welding of steel and iron     Optional brass bar solder plus appropriate flux. When s...

    The changes in the names of ERW and HFW change with the development of technology and the update of standards.     First of all, the equipment for high-frequency resistance welding steel pipes is produced in Germany, and the earliest domestic production lines are in Baoji and Jinxiculudao. These two sets of equipment are called middle straight seam and big straight seam. The early welding forms of this equipment are also two types, namely contact resistance welding and induction resistance welding. Although there are two welding methods, both referred to as ERW, but due to the consistency of the raw material coil during the early equipment, especially the accuracy of the edge The control and control of foreign equipment's configuration control are not good, resulting in unstable quality of contact welding, relatively speaking, the production rate of induction welding is relatively high, so the development of contact welding is lagging behind. However, with the ...