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Casing is important to oil drilling equipment, and its main equipment includes drill, core pipe and casing, drill collars and drilling small diameter steel pipe and so on.  The casing is used to support oil and gas wall of the pipe, to ensure that the drilling and completion of the process of the normal operation of the wells. Depending on the drilling each well depth and geological conditions, to use several layers of casing. Casing cementing go down after using it with tubing, drill pipe are different, can not be reused, a one-time consumable materials. Therefore, the total consumption of the casing is 70% of the oil well pipe. Casing can be pided according to usage: catheter, surface casing, casing and production casing. Casing is a large-diameter pipe, play a fixed oil and gas wells, or wellbore wall effect. The casing is inserted into the well hole, fixed with cement to prevent the formation and borehole spaced borehole collapse and to ensure circulation of the drilling mud to the drilling mined.  Casing is mainly used for drilling oil wells during drilling and after completion of the support wall to ensure that the conduct of the drilling process and completion of the wells after the regular oil casing normal operation. OCTG mainly used for oil and gas well drilling and oil and gas transportation. It includes oil drilling pipe, oil casing, pump tubing. Oil drill pipes are mainly used to connect the drill collar and drill and pass drilling power. Casing is mainly used for drilling and completion of the right wall of the support, to ensure that the conduct and completion of the drilling process after the normal operation of the wells. Pumping wells at the bottom of the tubing will mainly oil, gas transported to the ground.  Casing is to maintain the wells run lifeline. As different geological conditions, underground complex stress state, pulling, pressing, bending, torsional stress acting on the combined effect of the tube, which the casing itself, the quality of the higher requirements. Once the casing itself is damaged for some reason, could lead to the whole production wells, or even scrapped.

The downstream applications of industrial metal pipe fittings are extensive and involve the major industries of the national economy. Among them, petrochemical, nuclear power, thermal power, shipbuilding and military industries are the representative industries for their applications, especially the application of special metal fittings in these industries. . Through the analysis of industrial metal pipe fittings in several key industries and demand forecast application of the foreseeable future market prospects. 1. petrochemical industry Industrial pipe and pipe fittings as a mass transfer equipment in the pipe equipment, oil refining, chemical equipment for an important segment of the field. Commonly used industrial metal pipe materials are stainless steel, carbon steel, etc., are widely used in oil refining, chemical production in the pipeline connection, the other materials are titanium, aluminum, nickel, zirconium, etc., usually selected for specific use tube material . In recent years, refining, petrochemical enterprises to increase production capacity to intensify the transformation of large-scale, new large-scale oil refining, chemical engineering projects have been prepared by the localization of oil hydrogenation equipment and successively developed ethylene cracking and subsequent processing of key equipment Pulling, China’s refining, chemical production equipment manufacturing industry is growing rapidly. As the long-term operation of petrochemical equipment in high temperature or low temperature, high pressure, strong corrosion and other special circumstances, special metal materials in the petrochemical equipment in the proportion of demand for high, the current petrochemical industry, industrial metal fittings in the proportion of special metal pipe is about 50 / RTI & gt; With the increase in the proportion of poor use of crude oil, hydrogenation technology to promote the application of long-distance oil and gas pipeline construction, new coal chemical industry to accelerate the development trend of the application of special metal fittings will be more and more widely. The traditional single anti-corrosion technology and materials can not meet the needs of the development of oil and gas fields, therefore, oil and gas fields on the high steel grade, high corrosion resistance, low temperature and other pipe needs continue to increase. As the oil and gas field medium composition, pressure, temperature and other large difference between the corrosion environment, a large number of high corrosion resistance alloy will cause increased production costs and corrosion of the waste of alloy materials, so the development of both oil and gas fields to ensure safety and transportation, A new type of bimetallic composite materials has become the focus of the major oil and gas companies, bimetallic composite pipe and pipe products, the market demand is also the market demand is very high. getting bigger. “Petroleum and chemical industry,” second five “plan” forecast, “second five” during the industry average growth rate will remain at 10% or more to petrochemical industry, industrial metal pipe industry, the average annual growth rate of 10% and special metal pipe fittings A conservative estimate than 50% in 2015, China’s petrochemical industry, industrial metal pipe fittings and special metal pipe market size will reach 40 billion yuan and 20 billion yuan. 2. coal chemical industry China’s coal reserves are rich, accounting for 11.60% of the world’s total coal reserves. Since the founding of the country’s primary energy production and consumption of coal in the long-term ratio of more than 70%. According to the Ministry of Land and Resources data, as of the end of 2010, China’s total coal resources forecast of about 5.6 trillion tons, of which 1340.83 billion tons of resources have been identified. Relying on the rich coal resources, China’s coal chemical industry has been a good development. “Eleventh Five-Year” period, China’s coal chemical engineering construction total investment of about 500 billion yuan, China’s nitrogen fertilizer, calcium carbide, coke and other traditional coal chemical products production capacity, continue to rank in the world. At the same time, with the role of oil substitution of new coal chemical technology has made great progress, driven by high oil prices, the emerging coal chemical industry is the emergence of rapid development momentum. “Twelfth Five-Year” period of coal chemical industry investment will be China’s coal chemical metal pipe fittings and special metal pipe to bring new market demand. 3. nuclear power industry In the construction of nuclear power, fluid gas delivery requires the use of a large number of industrial pipelines, pipe connections to use a large number of pipe fittings. The medium of the nuclear tube is mainly composed of saturated steam, condensed water, radioactive water vapor heavy water, irradiation corrosive substance, radioactive medium, dilute sulfuric acid and lye, carbon dioxide, sodium, helium, oil and vacuum. Special, complex, harsh, coupled with a large amount of large, demanding, so a large number of nuclear power fittings using nickel-based alloys, titanium, zirconium and other special metal materials. In recent years, China’s nuclear power infrastructure investment accelerated. According to China Electricity Council statistics, in 2011 China’s nuclear power infrastructure investment reached 74 billion yuan, from 2007 to 2011, the average annual growth rate of nuclear power investment of more than 70%. From the perspective of China’s energy demand and supply situation, the development of nuclear power is an inevitable choice to ensure energy security in China. In October 2012, the State Council approved the “Mid- and Long-Term Development Plan for Nuclear Power (2011-2020)”, Kilowatts of nuclear power installed capacity of the target, under construction nuclear power installed capacity will be slightly more than 20 million kilowatts is expected in 2015 China’s nuclear power with industrial metal fittings and special metal fittings market capacity will reach 2.9 billion and 1.7 billion. The market of nuclear power fittings is pided into two parts: pipe fittings and pipe fittings. Many enterprises make petrochemical and thermal power market for a long time. The production technology is mature and it is easier to enter the nuclear power market after upgrading according to the nuclear power quality assurance system. At present, there are nearly 20 domestic and foreign manufacturers of pipe fittings which are qualified to participate in nuclear power projects. Chinese and foreign enterprises basically share half of the country, but foreign integrated group companies possess nuclear island main steam piping and fittings experience, Grade pipe market, the vast majority of domestic enterprises can only provide the nucleus level 2, level 3 of pipe fittings. 4. thermal power industry Thermal power plants require a significant amount of pressure piping and fittings to carry high-temperature fluids. In order to improve the efficiency of coal-fired power generation and protect the ecological environment, China has vigorously developed super-critical thermal power units with low coal consumption, low pollution and high efficiency in recent years. Thermal power units Industrial metal pipe fittings, especially those used in the four major thermal power plant pipe (main steam pipe, reheat steam pipe hot section, reheat steam pipe cold section and high pressure water supply pipe) to be subject to long-term high temperature and high pressure steam and high-speed fluid substances Erosion corrosion, the quality of the four major pipeline operation is essential. With the development of large-capacity, high-parameter, ultra-supercritical and water-saving environment-friendly units, the four large pipe fittings are required to increase the caliber and have better performance of high temperature resistance, high pressure resistance and corrosion resistance. , The use of P91, P92, P22 and WB36 have excellent heat resistance, high pressure performance of special metal materials, special metal pipe fittings are used for a large number of supercritical, supercritical parameters such as thermal power units in the pipeline. 5. shipbuilding industry As an important component of marine pipeline system, industrial metal pipe fittings are widely used in ships and offshore engineering equipment, and play the role of fluid and gas medium transportation. By the impact of the global economic crisis lag, the international shipping market downturn, China’s shipbuilding industry, industrial output growth slowed, but overall to maintain growth. The marine engineering equipment industry, as the material and technical foundation for the development and utilization of marine resources, has become the most promising field in the field of shipbuilding in the context of the increasing importance of continental shelf resources in China. Marine and marine engineering in the fluid, gas medium, including crude oil, chemical gases and other corrosive substances, while the ship metal pipe fittings exposed to long-term humid air, marine equipment, pipe fittings need to be soaked in seawater, so strong corrosion resistance Of the special metal materials such as titanium, nickel-based alloys have been gradually applied to ship metal pipe fittings, especially marine equipment, metal pipe manufacturing. 6. the military industry Military industry is a typical high-end equipment manufacturing industry, not only assume the transformation of China’s manufacturing industry an important task, but also China’s core science and technology source and driving force, is the future independent intellectual property rights and patents, the main creator. Military equipment, including military aircraft, aircraft carriers, nuclear submarines, military ships, tanks and so on. Military industry is the earliest use of special metal materials industry, and then gradually into the special metal materials, chemical, civil nuclear power, thermal power, ships and other fields. Pipe fittings as an important part of the military equipment pipeline system, but also a large number of special metal materials used to support military equipment to high-tech, modern direction. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Despite China’s signal to reduce its excess steel production capacity, industry executives said, the country has declared a “war” metal, has produced a “devastating” to the rest of the world industry. The steel industry overcapacity in recent years has been the industry side time bombs, driving prices down, make some steel & steel pipes enterprises difficult to survive. China’s low cost metal producers has been widely quoted as the main reason for the excess. In particular, the world’s second-largest economy was accused of “dumping” cheap steel & steel pipes into the global market, to gain market share, because of the slowdown in domestic demand. But Beijing has denied any wrongdoing and said its cost is lower than other manufacturers. This is war, not trade Other countries, including India, Italy, South Korea and Taiwan, also considered contribution to the global steel surplus. Export said, every country has its own set of subsidies and problems, “caused a lot of problems, dumping steel in the international market. However, similar to the oil industry, despite the falling demand, some manufacturers in order to support prices in 2015 before slowing production progress has been slow. In addition, it says, the oecd economies such as China is expected to lead to the global steel industry capacity expansion, its share in the world ability is expected to increase by 2017 to 71.4%. There is no sign that the global iron and steel production in the short term is slowing down. According to the world steel association statistics, in March 2016, the global crude steel production is 385.7 million tons, down 3.6% compared with the same period in 2015, China’s crude steel production in March, 2016 to 70.7 million tons, up 2.9% in March 2015. In March 2016 of India’s crude steel output of 8.1 million tons, a 3.4% growth in March, 2015. Export said, “just according to the Numbers, China is by far the biggest problem”, accusing China of not complying with the international trade rules. “If your competitiveness is based on deception international trade rules, you can’t call it their own competitiveness. There is no trade is not fair, but the war. Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

How to clean rusted carbon steel pipe? For the rusted carbon steel pipe, some people use cleaning, but when cleaning, it note that should a solvent, emulsion cleaning the steel surface, this method is only used as an anti-corrosion auxiliary means, for the real removal carbon steel pipe rust, the role is not strong. In clear carbon steel pipe rust, you can also use steel brushes, wire ball and other tools, such appearance loose oxide, rust easily removed, but not up to the requirements of corrosion. Another method is to remove the rust pickling, although this method can achieve a certain degree of cleanliness, but easy on the environment caused by pollution, so it is not recommended that you use. The best method is to use spray rust, leaf through a high-power high-speed rotary motor driven jet, so that grit, steel shot, wire segments, minerals and other abrasive under the centrifugal force on the stainless steel surface spray treatment. Rust is the result of high-power spray jet vane motor driven high-speed reverse, the grit, steel shot, wire segments, abrasive minerals under the effect of centrifugal force on the pipe exterior spray and disposal, shot blasting machine can completely eliminate rust, oxides and dirt, and the ferocity of the abrasive tube shocks and under the effect of friction, but also to reach the needs of the average roughness. Spray rust, can extend the appearance of physical adsorption tube effect, and can enhance the appearance of the pipe coating mechanical adhesion effect. Thus, the injection pipeline corrosion rust is rust fantasy method. In general, abrasive blasting is mainly used inside the tube looks disposal abrator surface rust mainly for pipe surface disposal. Importance in the production of surface treatment of the importance of strict control of rust when the process parameters, in actual construction, carbon steel pipe coating layer of the peel strength value greatly exceeds the standard requirements to ensure the quality of the coating, in the same equipment on the basis greatly improve the technological level, reduce production costs.

Hydrostatic test is necessary to ensure the quality of welded pipe production equipment.  Currently, the market is on the market welded pipe hydrostatic testing machine working process: feeding, clamping, filled with water, pressure, pressure, pressure relief, the material. The process also constitutes a basic action hydraulic tube loop, most modern hydraulic test machine adopts PLC control, so that all the work automatically in order to complete the process and parameters with automatic recording function test results. According seal can be pided into radial seal and seal. Radial seal is used with the welded pipe with inner or outer diameter seal, seal pressure through expansion in order to achieve the purpose of sealing the wall, the advantage of steel clamping and extraction is very easy, reliable sealing, welded pipe axial force is small, is not easy to bend, but the sealing head structure more complex specifications more, and the welded pipe end there blind test; seal sealing material is to rely on the spout nozzle face seal compression to achieve the purpose of testing the advantage of simple structure, , common good, but the sealing material properties and water pressure proportional and servo control systems require higher.  Pipe hydrostatic testing machine during the pressure test, the first sealing device right through the end of the test tube is sealed at both ends and low-pressure water injection, water injection process through the exhaust valve exhaust air in the tube, filled with water at low pressure, by increasing pressure device to inject high pressure water pipe pressurized until the required test pressure. After reaching the required test pressure holding pressure at the stipulated time, if the welded pipe is no leakage in the pressure test, deformation phenomena, proceed relief. Then open ends of the sealing device, the discharge pressure water pipe will be tested to the examination table visually inspected for suspicious penetration. Pressure test according to the standard required for the pressure curve during automatic recording device records.

Seamless oil casing, oil and gas exploration in the largest amount of a pipe, it relies on male and female buckle buckle which is screwed inside and outside, will a series deep underground steel pipe work. Oil well casing is the lifeline of its quality directly affects the success of drilling operations and the service life of oil and gas wells, related to the oil fields and the manufacturer’s economic benefits. Seamless Oil casing failure is one of the main problems encountered for each oil field, particularly among the most serious failure of the threaded joint. According to statistics, the oil casing failure occurs in about 64% of accidents threaded connections, the domestic this figure is as high as 86%, securing oil casing threaded joints are the weak link in the oil casing string, therefore, increase the thread connection quality is a key factor in ensuring the quality of the column. Oil casing threaded connections used in the stress distribution directly determines the strength of the connection string. Stress distribution of the parts of the study, not only for manufacturers optimize oil casing thread design, casing and tubing used for predicting the performance provide the basis, but also to guide the proper selection and use of oilfield tubing and casing also has a certain reference value. Seamless oil casing joints Seamless oil casing joints are externally threaded male buckle and belt buckle female threaded screw together composed of male and female buckle buckle the contact surface, which is a helical surface, and the oil tube fitting force is more complex. Apart screwed contact pressure generated torque, but also by tension (self-weight of the oil casing), pressure (by the oil, gas or other media caused by) the role of such loads. Oil casing the joint force analysis involves material nonlinearity, geometric nonlinearity and complexity of the contact friction conditions and other nonlinear problems establish a complete and accurate mathematical model, an analytical solution is very difficult.

Due to its advantages in materials, the application of stainless steel tube has been comprehensively promoted. As an important material in the pipeline. Stainless steel tube has obvious advantages in the market. Different from ordinary steel pipe, stainless steel pipe is made of alloy. Transportation, stainless steel pipe is mainly used for oil and gas transportation. Compared with ordinary transportation, pipeline transportation has more important significance. As a result, manufacturers continue to promote it. At the same time, with the development of the city, the stainless steel tube plays the most important role in the city construction. At most, it is a new mode of transportation, which is cheaper than other means. In order to meet the market demand, the number of stainless steel tube manufacturers will continue to increase. Now, stainless steel tubes are very popular. In the study of the stainless steel tube, we found that the stainless steel pipe has the air part, which can be used for conveying fluid, so the stainless steel tube is used in many fields. Has a good resistance performance, so in the oil, natural gas transportation is very easy and convenient. In the future, we can see more of the stainless steel tubes used in our lives. With the development of technology, the performance of stainless steel tube also has a lot of breakthrough. People can see stainless steel tubes used in every aspect of life. Outside, in the building construction, people can see parts of the stainless steel pipe. With high utilization rate, good effect, simple manufacturing process, low waste of materials, and many countries are promoting the use of stainless steel pipe. Now, the stainless steel tube has been widely used. Source: Zhejiang wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Seamless steel pipe industry maintained a strong momentum of development, is an important material of national economic development. Seamless steel pipe is a kind of economy, it is widely used in petroleum, electricity, chemical industry, coal, machinery, military industry, aerospace and other industries, the countries all over the world, especially developed countries attaches great importance to seamless steel pipe production and trade. China’s economic growth impetus to the development of the seamless steel tube industry. From the perspective of international experience, rapid growth is not the product of all industries balanced growth, but driven by a few of the rapid growth of leading industry. Different periods of leading industry, leading industry to promote the transformation of the sustained and rapid economic growth. From the perspective of domestic experience: in the 80 s dominant industry, light industry, textile industry, etc.; In the 90 s, the leading industry is the foundation of industry and infrastructure, a new generation of household appliance, real estate, etc.; After 1997, due to the leading industry there “pause” situation, the economic slowdown. This situation finally change until 2002, a new batch of leading industries to the surface. Leading is residential, automotive, electronics, communication and urban infrastructure construction industry leaders of these are the final product properties. Among these pilot industry produced some investment industry, mainly iron and steel, nonferrous metals, building materials, machinery, chemical materials and equipment industry. The above two aspects, also caused the electric power, coal, oil and other energy industry and ports, railways, highways and other transportation industry growth. Is the industry’s rapid growth has been driving the market demand of the seamless steel pipe, promote the rapid development of the seamless steel pipe industry. Seamless steel pipe industry and the sustainable and rapid development of domestic seamless steel tube market is currently in consumption growth opportunity. Consumption of domestic seamless steel tube will maintain rapid growth, the development of domestic seamless steel tube provides a favorable opportunity. One is the energy, transportation, petrochemical pipeline needs not reduce, high-performance varieties of rapid growth. The seamless steel tube in the energy, transportation, construction and maintenance of petrochemical facilities still occupied the position of steel market is very important. In recent years, the rapid increase of the demand for high performance and new varieties, such as high performance oil well pipe, large diameter power plant boiler pipe, corrosion resistance, low temperature resistance of petrochemical pipe and stainless steel tube, etc. Two, oil, natural gas, refined products, coal slurry, coal slurry pipeline fluid such as pipeline, especially for the demand of the high strength pipeline will rise sharply. Three is the construction rapid growth, high grade space grid tube construction demand rapid growth. Fourth, to the increasing demand for high technical content of steel pipe. Automotive, home appliances, shipbuilding, equipment manufacturing industries such as the demand of the seamless steel pipe, variety and quality requirement enhances unceasingly, all kinds of seamless steel tube is to develop in the direction of high technology. Source: Zhejiang wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

If your elbow is a short radius it is 1 times your nominal pipe diameter. If it is a long radius it is 1 1/2 times your nominal pipe diameter.show me the exact pattern of long radius. (90/2tan*Dia*1.5*25.4) (45/2tan*Dia*1.5*25.4) u will obtain Ur answer in (mm) For 90 degree elbow (Dia*38.1) this formula used for only 90 degree elbow. For 45 degree elbow (45/2of tan*Dia*1.5*25.4) this answer obtained in (mm).

There are many kinds of processing methods in seamless pipe bend production, let me introduce the fifth processing methods commonly used: Method: 1 stamping seamless elbow in production in the press by a core with a taper pipe expanding to the required size and shape. 2. Forging method: seamless pipe bend production by swaging machine will be at the end of the pipe or part shall be rushed out to the outer, commonly used swaging machine with rotary, connecting rod type, roller type. 3 rolling method: seamless elbows in production generally do not have the core shaft, suitable for thick wall pipe inside round edge. In the tube placement, peripheral roller push for circular edge processing. 4. Abscesses: seamless pipe bend in the production of a is placed in the inner tube rubber and above to punch the compression, the tube bulge forming; another method is hydraulic bulge forming, in the middle tube filled with liquid, liquid pressure to the pipe drum into the required shape, the bellows of production with the most is the method. bending forming method: seamless pipe bend production with three methods commonly used, a kind of method that extend method, another method called stamping method, the three roller method, 3 – 4 and, two fixed roller, an adjusting and, adjust roller is fixed from finished pipe is bent. Source: Zhejiang wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Resulting oil pipeline leakages is for many reasons, there are some followings below.  Some one-sided pursuit of profit, reduction of investment in safety protection facilities fierce competition in the market economy, in order to reduce costs, the pursuit of high profits, people are quick success, often there are chances, willful neglect of safety, reduction of safety protection facilities investment. In addition, state-owned oil company has been regarded as a leading enterprise, since it is the state-owned enterprises on the “stand toss”, it is this misconception makes some managers ideologically careless, negligent neglect of production and construction process management, the production site run, run, drip, leak precisely the consequences of its mismanagement, can benefit from a variety of spill management often find loopholes. Piping design unreasonable reasons exist congenital defects resulting pipeline is one of the main oil pipeline leak. Usually through the pipe connection part of the sealing structure and the sealing material or pipes conveying the medium pressure, temperature, nature or environmental conditions incompatible. During pipeline installation, failure to comply with operational process of order, it is bound directly related to pipeline installation quality, thereby affecting the runtime pipeline leakage.  Failure of the material forming the facility is to produce the main direct cause of leakage. Therefore research material failure mechanism is an effective means to prevent leakage. According to statistics, corrosion, cracks, wear, etc. leading to material failure, resulting in leakage of the main reasons. If a pipe weld porosity, slag or no penetration, cast iron pipe cracks, blisters; pipeline damaged by abrasion; aging pipes; stress concentration caused by intensity decreased; seal failure, and this will lead to pipeline leakage.  For the above reasons led to the oil pipeline leakage, and take effective measures to prevent leaks to prevent leakage build up layers of defense. Firstly, ideologically, it should be to establish a “spill prevention is equivalent to increase economic efficiency” understanding. Secondly, the development of a sound management measures to strengthen labor discipline, which is an important measure to prevent leakage. Secondly, doing preparatory work before pipe installation in the preliminary stages of the pipeline should understand and master the specific circumstances: including pipeline process, the nature of the job, the use of pressure, environmental conditions and special requirements; allowable leakage because of the size of the pipe is directly related pipeline project investment and operating safety, and must therefore be based on extensive research, strictly in accordance with the relevant national standards to determine allowable leakage pipeline, so that “temper justice with degree”; under normal conditions of use predictive pipeline to achieve durable leak-free status sex. While for pipeline leak may occur during operation and contingencies, to formulate a practical and reliable maintenance preventive measures.  It has proved that leaks often require subsequent treatment doubled the price to pay. In the pre-construction and construction take active preventive measures that can effectively reduce the occurrence of leakage and reduce the harm. Therefore, the emphasis Spill Prevention, conducted ahead of the investment, both necessary, but also economic benefits.

How to measure the length of steel pipe? According to the different requirements for the process, there are a variety of method of measuring the length of steel pipe following: 1, grating length measurement The basic principle is: the outside of the pipe ends were set two fixed-length grating, rodless cylinder driven grating measurement of the length of pipe near the pipe ends by optical interference phenomenon. its characterized by high accuracy. Grating expensive and difficult to maintain, very sensitive to dust and venues vibration. 2, the camera length measurement. The camera length measurement is the use of image processing steel tube length measurement, the principle is equidistant series of photoelectric switches installed in a section of the pipe conveyor roller, plus the light source and the camera on the other section. When the steel pipe after the region, according to a particular photoelectric switch through over cameras capture an image on the screen to determine the length of pipe. Can be achieved online measurement, pipe length data can be obtained through the length measurement area, no interval. If you do not have ad hoc light source, the steel pipe will be subject to interference from external light, and the adoption of ad hoc light steel pipe tube end chamfering high brightness of light reflected strong, likely to cause reading errors. 3, the encoder length measurement Principle is installed in the cylinder at the encoder, the use of the cylinders to promote the movement of the pipe in rollers, equidistant series of photoelectric switches installed on the other side, when the steel pipe encountered cylinder promote the tube end when the photoelectric switch, the readings recorded from the encoder converted the stroke of cylinder, so that we can calculate the length of the tubes. Its characterized by the pipe length measurement rising. In addition, photoelectric switches detect some error, may need to be fully measured. 4, the improved encoder length measurement This method is an indirect measurement, measured indirectly by measuring the distance between the two end faces of the steel pipe with the respective reference point, the length of pipe. Pipe ends each set 1 car length measurement, initial position zero bit, spacing of L. Then the Mobile Editor length to each steel pipe, tube ends walking distance (L2, L3), L-L2-L3 is the length of the tubes. This measurement is to overcome the large volume of steel pipe production complex environment of the scene, measuring mechanism can not pass through the lower part of the steel pipe support stand difficulties. This method is easy to operate, measurement accuracy within ± 10mm Repeat accuracy ≤ 5 mm.