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The classification of steel pipe 1, according to the production method of classification (1) seamless pipe, hot rolled, cold rolled tube, cold drawn tube, extrusion tube, pipe jacking welded pipe (2) (a) according to the technological points – arc welding pipe, electric resistance welding (high frequency and low frequency) and gas welding tube, furnace welding pipe. (b) according to the weld points – straight seam welded pipe, spiral welded pipe. 2, according to the cross section shape classification (1) simple section steel tube, round steel pipes, square steel tube, oval tube, triangular steel, hexagonal steel tube, the diamond steel pipe, octagon steel pipes, semicircle round steel, the other (2) complex cross section steel tube – not equilateral hexagon steel tube, five disc plum blossom shaped steel tube, double convex tube and double concave steel tube, melon seeds shaped steel tube, conical steel pipe, corrugated pipe, casing pipe and other 3, according to the classification of wall thickness, thin-walled steel tube ⒑ 4, according to use classification – pipe with steel tube, thermal technology equipment in steel, and machinery industry with a steel tube, petroleum, geological drilling in steel, container steel pipes, and chemical industry with a steel pipe, steel pipe, and other special purposes Second, the seamless steel tube. Is a hollow section, no seams around the strip steel. Steel pipe has a hollow section, a large number of used for conveying fluid pipe, such as oil, natural gas, coal gas, water and some solid materials, such as pipelines. Compared to the steel pipe and round steel solid steel bending torsional strength phase at the same time, the weight is lighter, is a kind of economic cross section steel, widely used in the manufacture of structural and mechanical parts, such as petroleum drill pipe, auto transmission shaft, bicycle frame and construction of steel scaffolding is used. With steel pipe manufacturing annular parts, can improve material utilization, simplifying the manufacturing process, material saving and processing time, such as rolling bearing ring, jack sets, at present has been widely made from steel pipe. Steel pipe or all kinds of conventional weapons indispensable materials, gun, gun barrel to steel pipe manufacturing. Steel pipe according to the cross-sectional area in the shape of different can be pided into circular tube and special pipe. Due to the equal conditions, the circumference circle area is the largest, with circular tube can deliver more fluid. In addition, the circle cross section under radial pressure, the internal or external stress is relatively uniform, therefore, the vast majority of steel tube is round tube. But, pipe also has some limitations, such as in the plane bending condition, the pipe is not square, rectangular tube bending strength is big, some agricultural machinery and skeleton, rectangular tube, steel wood furniture is commonly used. According to the different USES also needs to have other cross section shape of profiled steel pipe. 1. The structure with seamless steel tube (gb/t8162-1999) is used for general structure and the mechanical structure of seamless steel tube. 2. Fluid with seamless steel tube transmission (gb/t8163-1999) is used for conveying water, oil, gas and other fluid general seamless steel tube. 3. Low medium pressure boiler seamless steel tube (gb3087-1999) is used in the manufacture of various structural low intermediate pressure boiler superheated steam pipe, water pipe and locomotive boiler superheated steam pipe, pipes, small pipe and arch brick works of high quality carbon structural steel hot rolling and cold drawing (rolling) seamless steel tube. 4. High pressure boiler seamless steel tube (gb5310-1995) is used in the manufacture of high pressure and over pressure water tube boiler heating surface quality carbon steel, alloy steel and heat resistant stainless steel seamless steel tube. 5. Fertilizer equipment with high-pressure seamless steel tube (gb6479-86) is applicable to the working temperature for – 40 ~ 400 ℃, the working pressure of 10 ~ 30 ma chemical equipment and pipeline of high quality carbon structural steel and alloy steel seamless steel tube. 6. Seamless steel tube used in oil cracking (gb9948-88) is suitable for oil refinery furnace tube, heat exchangers and pipe seamless steel pipe. 7. Geological drilling with steel tube (yb235-70) is for the use of geological departments the core drilling of steel pipe, according to the purpose can be pided into the drill pipe, drill collar, core pipe, casing and precipitation, etc. 8. Diamond core drilling with seamless steel tube (gb3423-82) is used for diamond core drill pipe, core rod, casing of seamless steel tube. 9. The oil drill pipe (yb528-65) is used in oil drilling at both ends of seamless steel tube with thick or external upset. Pole points two car and car silk, silk work joint connection, no car work butt welding method and the tool joint connection. 10. Ship with carbon steel seamless steel tube (gb5213-85) is the manufacturing of ship class I pressure piping, ii grade pressure piping and boilers and overheating for carbon steel seamless steel tube. Carbon steel seamless steel tube wall temperature does not exceed 450 ℃, the alloy steel seamless steel tube wall temperature over 450 ℃. 11. Automobile axle works seamless steel tube (gb3088-82) is the manufacturing automotive axle tube and shell shaft drive axle bridge works of high quality carbon structural steel and alloy structural steel hot-rolled seamless steel tube. 12. The diesel engine with high-pressure tubing (gb3093-86) is a manufacturer of diesel injection system high pressure work cold drawn seamless steel tube. 13. The hydraulic and pneumatic cylinder with precision inner diameter seamless steel tube (gb8713-88) is used in manufacture of hydraulic and pneumatic cylinder is precision cold drawn or cold rolled precision seamless steel tube diameter. 14. Cold drawn or cold rolled precision seamless steel tube (gb3639-83) is used in the mechanical structure, hydraulic equipment of high dimensional accuracy and surface finish good cold drawn or cold rolled precision seamless steel tube. Choose precision seamless steel tube manufacturing mechanical structure or hydraulic equipment, etc., can greatly save the machining time, improve material utilization, at the same time to improve the quality of the product. 15. Structure with stainless steel seamless steel tube (gb/t14975-1994) is widely used in chemical industry, petroleum, textile, medical, food, machinery and other industrial corrosion of pipeline and components and parts are made of stainless steel hot rolling (crowded, expanding) and cold drawing (rolling) seamless steel tube. 16. The fluid conveying stainless steel seamless steel tube (gb/t14976-1994) is used for conveying fluid made of stainless steel hot rolling (crowded, expanding) and cold drawing (rolling) seamless steel tube. 17. Heterotypic seamless steel tube is in addition to the outside of the pipe cross section shape of the floorboard of the seamless steel tube. According to the size of steel pipe cross section shape is different and can be pided into such as wall thickness seamless steel tube (code-named d), ranging from wall thickness seamless steel tube (code-named bd), variable diameter seamless steel tube (code-named bj). Alien seamless steel tube is widely used in all kinds of parts, tools and machinery parts. Compared with those of circular tube section tube usually have large moment of inertia and section modulus, have bigger bending torsional capacity, can greatly reduce the structure weight, save steel. Third, welded steel pipe Welded steel pipe and welded pipe, is to use steel plate or steel strip after crimp molding made of welded steel pipe. Welded steel pipe production technology is simple, high production efficiency, varieties, specifications, less equipment investment, but the general strength is lower than the seamless steel tube. Since the 1930 s, with the rapid development of high quality strip steel rolling production and the progress of welding and inspection technology, constantly improve the weld quality, increasing varieties of welded steel pipe specifications, and in the field of more and more instead of seamless steel tube. In the form of welded steel pipe according to the weld seam welded pipe and spiral welded pipe. Straight seam welded pipe production technology is simple, high production efficiency, low cost, rapid development. The strength of the spiral welded pipe is generally higher than straight seam welded pipe, use a narrow billet production of larger diameter welded pipe, you can also use the same width of billet in the production of different pipe diameter welded pipe. But compared with the same length of straight seam pipe, weld length by 30 ~ 100%, and the production speed is low. As a result, a small diameter welded pipe are mostly with straight seam welding, large diameter welded pipe for the most part adopts spiral welded. 1. The low pressure fluid conveying in welded steel pipe (gb/t3092-1993), also known as general welded pipe, commonly known as the clarinet. Is used to transport oil, gas, air, water and heating steam and other general low pressure fluid and other purposes of welded steel pipe. Steel tube wall thickness is pided into ordinary steel pipe and increasing pipe; To take over the side form is pided into without thread steel pipe (light pipe) and take rebar. Of the specifications of the steel tube with a nominal diameter (mm), nominal diameter is the inner diameter of approximation. Traditionally used in said, such as 1 1/2. Low pressure fluid conveying in welded steel pipe in addition to directly used for conveying fluid, also used as a low voltage large amounts of fluid conveying with galvanized welded steel pipe. 2. Low pressure fluid conveying with galvanized welded steel pipe (gb/t3091-1993), also known as galvanized welded steel pipe, commonly known as the white tube. Is used to transport oil, gas, air, water and heating steam, warm water generally low pressure fluid or other purposes such as hot dip galvanized welded butt weld or welding steel pipe. Steel tube wall thickness is pided into ordinary galvanized steel pipe and thickening of galvanized steel pipe; To take over the side form is pided into without thread galvanized steel pipe and galvanized steel pipe with screws. Of the specifications of the steel tube with a nominal diameter (mm), nominal diameter is the inner diameter of approximation. Traditionally used in said, such as 1 1/2. 3. The ordinary carbon steel wire casing (gb3640-88) is an industrial and civil construction and installation of machinery and equipment, such as electrical installation of the steel tube is used to protect the wire. 4. The straight seam welded steel pipe (yb242-63) is the weld and the steel tube parallel to the longitudinal steel pipe. Usually pided into metric welded steel pipe, welded thin-wall tube, transformer cooling pipe and so on. 5. Confined fluid conveying with spiral seam submerged arc welding steel pipe (sy5036-83) is a hot rolled steel coil tube billet, often spiral shape, with double-sided submerged arc welding method, welding, spiral seam steel pipe used for pressurized fluid conveying. Steel tube confined ability, good welding performance, through strict scientific inspection and testing, the use of safe and reliable. Steel pipe diameter is big, high transmission efficiency, and can save laying pipelines. Mainly used for conveying oil, natural gas pipeline. 6. Confined fluid conveying with high frequency welding steel pipe spiral seam (sy5038-83) is a hot rolled steel coil tube billet, often spiral forming temperature, using high-frequency welded lap welding method, used in pressurized fluid conveying spiral seam high frequency welding steel pipe. Steel tube confined ability, good plasticity, easy to welding and processing molding; After all kinds of strict and scientific inspection and testing, the use of safe and reliable steel pipe diameter is big, high transmission efficiency, and laying pipelines of investment can be saved. It is mainly used for laying of pipeline transport oil, gas, etc. 7. General low-pressure fluid conveying spiral seam submerged arc welding steel pipe (sy5037-83) is a hot rolled steel coil tube billet, often temperature spiral forming, the double automatic submerged arc welding or one side welding into legal system for water, gas, air and steam general low-pressure fluid conveying with submerged arc welding steel pipe. 8. General low-pressure fluid conveying spiral seam high frequency welded steel pipe (sy5039-83) is a hot rolled steel coil tube billet, often spiral forming temperature, using high-frequency lap welding welding for general low-pressure fluid conveying spiral seam high frequency welding steel pipe. 9. The pile with spiral weld pipe (sy5040-83) is a hot rolled steel coil tube billet, often spiral shape, made of double-sided submerged arc welding or high frequency welding, used in civil construction structure, port, bridge foundation pile with steel pipe. Source: China Steel Pipe Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Pipe tee is a pipe for pipeline branch. For using seamless tube manufacturing pipe tee is usually adopted by the process has two kinds of hydraulic bulging forming and hot pressing. A hydraulic bulging: three links of hydraulic bulging is through the metal materials of axial compensation bulge out a kind of branch pipe forming process. The process is to use special hydraulic press, with three links within the tube billet diameter equal injection liquid, through the two horizontal side of the hydraulic cylinder synchronization of the motion of tube billet, billet after squeezed smaller volume, smaller volume of liquid with the tube billet inside the tube billet and pressure, when pressure pipe tee branch pipe bulge out to the metal material in the liquid in the cylinder and the pipe pressure under the dual role of flow along the mold cavity and the branch pipe. 2. Thermoforming: pipe tee thermoforming is greater than three links of the diameter of the tube billet, flattening diameter size, about to pipe tee at the site of the tensile branch open a hole; Tube billet heating, in the forming die, and within the tube billet load stretching pipe punching die; Under the action of pressure pipe by radial compression, the radial compression in the process of metal flow in the direction of branch pipe and branch pipe formed under tensile of progressive die. The whole process of the pipe is made by the radial compression and branch pipe drawing process and forming parts. Unlike hydraulic bulge forming pipe tee, hot-pressing pipe tee branch pipe of metal is of the pipe by the radial motion compensation, so also known as the radial compensation technology. Source: China Pipe Tee Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

There are two kinds of pipeline sight glasses: There are two types of duct pipeline sight glasses: First, the glass pipe sight glasse, observation of large field of view, light transmission is good, simple structure, cost-effective, but the pressure is low (generally not more than 0.6MPa); Second, the glass plate through sight glass, the use of high pressure, because the glass window completely out of the pipeline a variety of stress, the relative service life is high, replacement and maintenance is also more convenient, but the structure is complex and cost higher. In addition, the use of ordinary tempered glass temperature between 0 to 200 degrees, the use of temperature, it is necessary to use high borosilicate or quartz high temperature glass; Secondly, according to the corrosive media choose a cost-effective sight glasse material; Finally, according to the actual situation selected lens and pipe connection, there are flanges, threads, welding, quick connection and so on. Source: China Pipe Fittings Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Sanitary pipe fittings are used for a relatively high level of health fittings, the main material for the composition of stainless steel. Although it is stainless steel, stainless steel is also a time when the rust. Since it is sanitary pipe fittings, if it is rusty, then it can not be used as a health, so in the use of time must be to prevent the health of the pipe rust, the following describes several effective way to prevent sanitary pipe rust. 1, not in contact with other metals Sanitary pipe fittings will be exposed to dissimilar metals and rust, such as fixed screws. At the beginning may not be very serious, you can use the sea or cloth, plus a neutral cleaning agent to wipe, it is also easy to clear rust. After cleaning must be careful not to let the cleaning liquid to stay in the above. If the beginning did not pay attention to the late will show a serious brown rusty state. If this is the case, you can use some stainless steel cleaning solution or 15% concentration of nitric acid dilution after cleaning work. Of course, there may be a very stubborn rust, so you can use a stainless steel brush to wipe the wipe, and finally clean with a cleaning solution. 2, Sanitary pipe fittings affected by the gas caused by rust In some factories or in the streets of a large number of traffic environment, the surface of stainless steel is very easy to pollute, and sometimes will show a small spot rust. Most of these conditions are affected by cars, cold and warm gas excluded by the rust. When the pollution is mild, you can use a neutral detergent or soapy water can be cleaned, but the serious time can not be simply handled. If you use this environment for a long time, then it is necessary to regularly clean the Sanitary pipe fittings. 3, the impact of the environment Such as in the coastal area and other positive sea breeze blowing, stainless steel also hi in the short term produce red rust. But also faster than rust in other areas. If you can not avoid these problems, you can only slightly stronger corrosion resistance of 316 stainless steel, but also regularly do a good job cleaning. 4. Sanitary grade pipe attached to the cleaning solution caused by rust If the neutral detergent can not be used to clean, the use of cleaning liquid to clear. 5. Sanitary grade pipe due to hand or fingerprint caused by rust If the neutral detergent can not be used to clean, then use sponge, cloth, and so on with organic solvents (alcohol, light oil, acetone, etc.) to wipe. This method can not be completely removed, and then use stainless steel cleaning liquid to clear. In general, a variety of cleaning methods to do after cleaning, you must do a water rinse. Source: China Sanitary Pipe Fittings Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

After processing and molding, the surface of stainless steel pipe fitting should pass a certain treatment to make more excellent performance of the stainless steel pipe fittings, say if the stainless steel pipe fittings that is not processed then its superiority is shown not to come out. So what treatment will you take to the surface of the stainless steel pipe fittings? Usually the most common surface treatment methods have several: surface color bleaching processing, surface mirror guang liang treatment, surface coloring treatment. Surface color bleaching processing: stainless steel in the process of machining, through rolled plate, edge, welding or through artificial surface fire heating processing, producing black oxide coating. The hardness of film of oxide skin mainly NiCr2O4 and NiF two EO4 composition, before the general removal using strong corrosion of hydrofluoric acid and nitric acid method. But this method cost, environmental pollution, harmful to human body, corrosion resistance, be being washed out gradually. At present to scale processing method mainly has two kinds: Sand blasting method (pill) : mainly adopt the method of spray micro glass bead, remove black oxide on the surface of the skin. Chemical method: using a non-polluting pickling passivation paste and normal temperature non-toxic cleaning fluid with inorganic additives for baptism. To achieve the aim of bleaching processing stainless steel color. Handle is largely seems to be a light color. This method is useful for large, complex products is. Mirror bright stainless steel surface treatment: according to the complexity of the stainless steel products and the user request is different respectively by mechanical polishing, chemical polishing and electrochemistry polishing method to achieve bright luster. Surface coloring treatment: stainless steel coloring stainless steel products of various colors, not only increase the designs and varieties of products, and improve the wear resistance and corrosion resistance. Stainless steel coloring method has the following kinds: 1, chemical oxidation coloring 2, electrochemical oxidation coloring 3, ion deposition oxide coloring 4, high temperature oxidation coloring 5, gas phase cracking staining method Source: China pipe fitting Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

In the purchase of stainless steel pipe fittings and other stainless steel products, usually the price of stainless steel products are measured by its weight, and sometimes we have to know its weight is not accurate, so we must through a certain method to estimate the stainless steel pipe fittings weight. Here are some of the estimated method of stainless steel weight. ● Chrome stainless steel to take 7.75 tons / M3 ● chrome-nickel stainless steel to take 7.93 tons / M3 ● iron to take 7.87 tons / M3 Standard Calculation Formula of Stainless Steel Plate Steel Product Weight Weight (kg) = Thickness (mm) × Width (mm) × Length (mm) × Density Density material 7.93 201,202,301,302,304,304L, 305,321 7.75 405, 410, 420 7.98 309S, 310S, 316S, 316L, 347 Stainless steel rods, wire, theoretical calculation formula ★ diameter × diameter × 0.00609 = kg / m (for 410 420 420j2 430 431) For example: ¢ 50 50 × 50 × 0.00609 = 15.23Kg / m ★ Diameter × diameter × 0.00623 = kg / m (for 301 303 304 316 316L 321) For example: ¢ 50 50 × 50 × 0.00623 = 15.575Kg / m Stainless steel profiles, theoretical formulas ◆ hexagonal bar on the side × opposite side × 0.0069 = Kg / m ◆ square bar wide width × width × 0.00793 = Kg / m Stainless steel pipe, theoretical calculation formula ○ (outer diameter – wall thickness) × wall thickness × 0.02491 = Kg / m For example, ¢ 57 × 3.5 (57-3.5) × 3.5 × 0.02491 = 4.66Kg / m Standard calculation formula for stainless steel pipe Pipe (outer diameter – wall thickness) X wall thickness X0.02491 = weight per meter Round steel outside diameter X outside diameter X0.00623 = weight per meter Pipe pressure = wall thickness ※ OD X416 = MPa X9.8 = kg with 30% Square tube of the formula is: 0.0246615 * (side length * 4 ÷ 3.14 – thickness) * thickness. If it is a rectangular tube, the formula is: 0.0246615 * {(length + width) * 2 ÷ 3.14 – thickness} * thickness Source: China pipe fittings Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Stainless steel pipe fittings are usually installed when the need for welding, due to the special nature of the material, stainless steel pipe fittings in the welding is different from the ordinary pipe welding. And welding finished the treatment of the weld is different, stainless steel pipe weld not only requires the beauty can not rust, then the stainless steel pipe welding and processing process is how it? As the stainless steel pipe pieces of different sizes, according to the unique place of stainless steel pipe welding, as far as possible to reduce the amount of heat input, so the use of manual arc welding, argon arc welding two methods, d> Φ159 mm using argon arc welding, Arc welding cover. D ≦ Φ159 mm full of argon arc welding, stainless steel pipe welding technical requirements are as follows: ①manual arc welding machine using DC reverse, argon arc welding with DC is followed. ②welding should be welded with stainless steel wire brush off the surface of the oxide, and acetone washing, the electrode should be 200-250 ℃ drying 1h, with the take with the use. ③Clean the oil in the range of 25 mm on both sides of the workpiece groove before welding, and wash the groove on both sides with 25 mm on both sides of the bevel. ④argon arc welding, the nozzle diameter Φ2 mm, tungsten is extremely pot tungsten, specifications Φ2.5 mm. ⑤TIG welding stainless steel, the back must be filled with argon protection, in order to ensure the back forming. Using the method of partial argon in the pipeline, the flow rate of 5-14L / min, positive argon flow rate of 12-13L / min. When welding the thickness of the weld should be as thin as possible, and the root fusion outstanding, when the arc into a slow slope, if the arc shrinkage, the application of grinding machine wear off. Must be arc in the groove arc, arc should be filled with craters, to prevent cracks in the arc. As the stainless steel pipe fittings for the austenitic stainless steel pipe, in order to prevent carbide precipitation and intergranular corrosion, should strictly control the inter-layer temperature and post-weld cooling rate, the requirements of the inter-layer temperature control between 60 ℃, Immediately water-cooled, while the use of sub-welding. This symmetrical dispersion of the welding sequence, you can increase the joint cooling rate, but also reduce the welding stress. Source: China Pipe Fittings Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Stainless steel elbow in the processing after forming, the first thing to be done is its polished, polished can make the surface of stainless steel elbow more bright, but also to remove some forged corners and so on. 1, polished elbow when the use of 80 mesh blinds, black relatively easy to use, apprentice suggested that the red, must be slow, can not use pressure, polished as much as possible flat grinding machine. 2, all grinded began to change the purpose of 320 blinds re-grinding wheel, 320 head wheel must be polished very meticulous, or will leave 80 mesh wheel scratches. 3,320 heads of lobes polished after grinding, gave the elbow wax, novice more points on the better. 4, and then continue to polite with kenaf wheel, then forced to press the grinding, the more force the better. 5, after grinding to remember to wax paint clean, with a little dust paint more easily Oh. Note: Note that grinding can not be too hasty, pay attention to do not grinding to the wire Long-term storage of stainless steel elbow, should be checked regularly, often on the exposed surface to be clean, remove dirt, cleanly stored in the indoor dry and dry place, is strictly prohibited or open storage. Often keep the stainless steel elbows dry and breathe, keep the fixtures clean and clean, and store them in accordance with the exact storage method. Source: China Elbow Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Stainless steel elbow is the use of stainless steel processing made of elbow, the advantages of stainless steel we all know that it is more resistant to corrosion, so the stainless steel elbow after the completion of the use and storage of which is also to pay attention to some of the problems, although stainless steel Material is more resistant to corrosion, but if the maintenance of improper storage, then it is easy to cause damage and pollution of stainless steel elbow. In the use and maintenance of stainless steel elbow need to pay attention to a lot of things, users need to follow a certain method of use, in accordance with accurate and fair method of use and maintenance. Note the following: 1, long-term storage of stainless steel elbow, should be checked regularly, often on the exposed surface to be clean, remove the dirt, cleanly stored in the indoor dry place, is strictly prohibited or open storage. Often keep the stainless steel elbows dry and breathe, keep the fixtures clean and clean, and store them in accordance with the exact storage method. 2, the installation, the stainless steel elbow can be connected directly by the way in the pipeline, according to the location of the installation. Under normal circumstances, can be installed in any position on the pipeline, but need to facilitate the operation of the inspection, pay attention to cut off the stainless steel elbow media flow should be below the vertical valve flap, stainless steel elbow can only be installed horizontally. Stainless steel elbow in the installation should pay attention to sealing, to prevent the phenomenon of thrown, affecting the normal operation of the pipeline. 3, stainless steel elbow ball valve, globe valve, gate valve use, only for full open or closed, do not agree to do with the regulation of flow, so as to avoid the erosion of the sealing surface to accelerate wear. Gate valve and the upper thread cut-off valve with inverted sealing device, hand wheel to the top position of the tightening, you can prevent the media from the filler leakage. 4, stainless steel elbow application hand wheel, do not use the lever or other tools, so as not to damage the valve. Handwheel turns clockwise for rotation, and vice versa. When you use justice, to ensure accurate use of methods and means. 5, stainless steel elbow valve packing gland bolts should be tightened evenly, should not be pressed into a crooked state, so as not to bump the stem movement or cause leakage. 6, stainless steel elbow in the use of the process, should always keep clean, the transmission thread must be lubricated on time, found fault, should immediately stop using, to identify the reasons to clear the fault. Source: China Elbow Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

The use of stainless steel pipe fitting is very wide, not only because of its high corrosion resistance, stainless steel tube bright and beautiful appearance also played a certain decorative role. Usually the surface of the stainless steel pipe is bright, we feel that the better the stainless steel pipe, in addition to the late grinding treatment, what factors can affect the brightness of stainless steel pipe it? Production of stainless steel pipe fittings after annealing the brightness of the product determines the quality of the product. Affect its brightness there are many, here for everyone to talk about the most important five factors: 1, the annealing temperature is to achieve the required temperature Stainless steel pipe heat treatment is generally taken to solve the heat treatment, which is commonly known as “annealing”, the temperature range of 1040 ~ 1120 degrees (Japanese standard). You can also observe the hole through the annealing furnace observation, the annealing area of the stainless steel pipe fittings should be incandescent state, but did not appear softening spreader sagging. 2, the annealing atmosphere is generally used as the annealing atmosphere of pure hydrogen, the atmosphere purity is best to more than 99.99%, if the atmosphere is another part of the inert gas, then the purity can be lower, but definitely can not contain too much oxygen, water vapor. 3, the furnace sealed bright annealing furnace should be closed, and the outside air isolation; the use of hydrogen as a protective gas, and only one exhaust port is through (to ignite the discharge of hydrogen). Check the method can be used soap water wiping the joints in the annealing furnace joints to see whether the run; which is the most easy to run the place where the furnace into the pipe and the place where the tube, the place of the ring is particularly vulnerable to wear, Always check for regular changes. 4, to protect the gas pressure In order to prevent the occurrence of micro-leakage, the furnace gas should maintain a certain positive pressure, if it is hydrogen protection gas, the general requirements of more than 20kBar. 5, the furnace steam on the one hand to check the furnace material is dry, the first furnace, the furnace material must be dried; the second is into the furnace stainless steel pipe is too much residual water stains, special pipe above if there are holes, Do not leak into the gas, or else put the furnace atmosphere destroyed. Generally, if normal, then the furnace should be back after about 20 meters of stainless steel pipe will begin to shine, bright reflective of the kind of need to pay attention to the most important thing is that we mentioned in the above knowledge, and hope that everyone in the production When you can pay attention. Source: China Pipe Fittings Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Stainless steel elbows buried in the ground can reduce the area, basically from the climate and the season and other external factors, more importantly, can reduce the heat transfer in the heat loss and prevent the pipe and pipe stainless steel elbow heat deformation. In order to reduce the heat loss and prevent the deformation of the stainless steel elbow, pipe buried depth should be 1.2 meters or more. (Calculated from the top of the tube). Alpine areas buried depth should be properly deepened. At the same time, the pipeline should be avoided at the groundwater level below. The groundwater level is higher or difficult for other reasons difficult to dig deep, should try to take waterproof and then take the safety measures after the pipe, the conditions are not available, but also take a shallow digging deep, that is, ditch to dig above the groundwater level Ten centimeters, and then according to the provisions of casing, the formation of embankment. But this will be put into operation after the maintenance of a greater difficulty in order to prevent pipe and stainless steel elbow deformation, to ensure that the casing pressure, shallow digging deep section of the casing thickness should not be less than 1.5 meters. Drawing and analyzing the hydraulic gradient line will help to study the oil pipeline and stainless steel pipe work after a variety of processes and a variety of conditions under the characteristics. For example, the state of the study graph can be said that when the flow rate is working and the viscosity of the liquid becomes large, the pressure at the end point becomes smaller due to the increase in hydraulic gradient. We use the steady-state pressure distribution diagram to study the working conditions of the pump station in detail. When the pump station is operated by the “tank” process, the pressure diagram of each section is independent of the operation of the adjacent stainless steel pipe fittings. The pressure at the starting section is determined by the work of the pumping station, and the pressure at the end point is determined only by the level of the liquid in the tank. However, as we have learned about the pump’s characteristic curve, when the flow increases, the pressure generated by the pump is reduced, so the pressure of the pump will be lower than that of the original working unit, and the stiffness of the stainless steel pipe Will also increase. Pumps and piping characteristics are the methods of combining the characteristic curves, and these methods are used when adjusting. Stainless steel elbow to change the characteristics of the pipeline can be used throttling and reflow method. At the time of throttling, the pressure loss caused by the hydraulic resistance established by the throttling member in the liquid flow limits the pressure behind the throttling member. When changing the hydraulic resistance, the throttle increases the loss and reduces the resistance to reduce the loss. Since the throttle resistance is placed within the pipe and the stainless steel elbow and is always in the liquid flow, there is always a pressure loss, even when there is no need to limit the pressure. Therefore, in the use of throttling adjustment, in order to compensate for the loss of throttle devices, oil always have additional energy consumption, usually these losses are 10-15 kPa. That is, in the rated conditions, stainless steel elbow throttling device energy loss of less than 1%. Source: China Elbows Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

In a piping system, the elbow is a pipe fitting that changes the direction of the pipe. According to the angle, there are 45 ° and 90 ° 180 ° three kinds of the most commonly used, according to the project also includes 60 ° and other non-normal angle elbow. Elbow materials are cast iron, stainless steel, alloy steel, malleable cast iron, carbon steel, nonferrous metals and plastics. Elbow weight calculation formula: Circle volume = 2X3.14X3.14 (r ^ 2) R R – Circle radius R – Ring radius of rotation Hollow tube ring volume = 2X3.14X3.14 ((r ^ 2) – (r ‘^ 2)) R R ‘- radius of the inner circle of the ring 90,60,45 degrees elbow (elbow) volume is the corresponding hollow tube ring volume of 1/4, 1/6, 1/8. The density of steel is calculated on the basis of weight by 7.85 kg / m dm, density X volume = weight (mass). Note: 1,180 ° elbow calculated by the table 2 times, 45 ° by 1/2; 2, R1.0DN elbow weight calculated according to Table 2/3; 3, the table does not list the weight of the wall thickness, preferably with the similar two weight calculation of the average; 4,90 ° elbow calculation formula; 0.0387 * S (D-S) R / 1000 where S = wall thickness mm D = diameter mm R = bending radius mm Source: China Elbow Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)