About steel pipe fittings

Product information about elbows Steel pipe elbow (sometimes also refereed as bends) is a key part in a pressure piping system used to change the fluid flow direction. It is used to connect two pipes with same or different nominal diameters, and to make the pipe and thus the fluid direction turn to a certain direction of 45 degree or 90 degree. This change in fluid flow direction adds pressure losses to the system due to impact, friction and re-acceleration.Classification of Steel Pipe ElbowsSteel pipe elbows can be classified through following various parameters,Direction AngleLength and RadiusConnection with PipeMaterial of ConstructionTypes of Elbows based on Direction AngleAccording to fluid flow direction of the pipes, elbows can be divided into different degrees, such as 45 degree, 90 degree, 180 degree, which are most common elbows. Also there are 60 degree and 120 degree elbows for some special pipelines. This degree is just an representation of the angle by which the fluid flow is going to change after flowing through the said elbow. Types of Elbows based on Length and RadiusElbows are split into two groups which define the distance over which the flowing fluid change direction; the center line of one end to the opposite face. This is known as the “Center to Face” distance and is equivalent to the radius through which the elbow is bent.If the radius is the same as pipe diameter (Center-to-Face dimension of 1.0 X diameter ), it called Short Radius Elbow (SR elbow) used normally for low pressure and low speed pipelines or in tight areas where clearance is the main issue. If the radius is larger than pipe diameter (Center-to-Face dimension of 1.5 X diameter) then we call it a Long Radius Elbow (LR Elbow) used for high pressure and high flow rate pipelines.

Steel pipe bends material and caculating Material of steel pipe bends 1111MicrosoftInternetExplorer402DocumentNotSpecified7.8 磅Normal0 Pipe fittings are necessary to join together pipes, or to change the direction of an existing pipe. Pipes and pipe fittings are made of a variety of materials, depending on the fluid or gas being transported. Most pipe fittings tend to be either threaded or able to slip over the pipes they connect. Whether you are using steel pipes of PVC pipes, a chemical solvent is required to create a seal between the pipe and the fittings.Measure the required length of the pipe to be installed, keeping in mind the extra length required where the pipe will be inserted into the fitting. Mark this length on the pipe. The pipe bending is used to change the direction of run of pipe.It advantage is can match long distance transition requirements, so it is commonly that bends dimension according to customer design.MaterialsThey are manufactured utilizing higher grade raw material, advanced machines and technologies.Abrasion resistant: Ceramic lined, Ceramic tile, Bi-metal clad pipe bending, Rare earth alloy wear-resistant pipe bendingCarbon steel:ASTM A234 WPB, ASTM A234 WPC, ASTMA42 WPL6, ASTMA42 WPL3, WP1. MSS-SP75, WPHY, WPHY 46, WPHY 52, WPHY 56, WPHY 60, WPHY 65, WPHY 70DIN 1629 St37, RST37.2 St52, STPG38  How to Calculate a Pipe Bend? Pipe fittings are necessary to join together pipes, or to change the direction of an existing pipe. Pipes and pipe fittings are made of a variety of materials, depending on the fluid or gas being transported. Most pipe fittings tend to be either threaded or able to slip over the pipes they connect. Whether you are using steel pipes of PVC pipes, a chemical solvent is required to create a seal between the pipe and the fittings.Measure the required length of the pipe to be installed, keeping in mind the extra length required where the pipe will be inserted into the fitting. Mark this length on the pipe.Beveled EndsThe ends of all butt-weld fittings are bevelled, exceeding wall thickness 4 mm for austenitic stainless steel, or 5 mm for ferritic stainless steel. The shape of the bevel depending upon the actual wall thickness. This bevelled ends are needed to be able to make a "Butt weld". Measure the required length of the pipe to be installed, keeping in mind the extra length required where the pipe will be inserted into the fitting. Mark this length on the pipe.Beveled EndsThe ends of all butt-weld fittings are bevelled, exceeding wall thickness 4 mm for austenitic stainless steel, or 5 mm for ferritic stainless steel. The shape of the bevel depending upon the actual wall thickness. This bevelled ends are needed to be able to make a "Butt weld".Welding Bevel acc.to ASME / ANSI B16.9 and ASME / ANSI B16.28ASME B16.25 covers the preparation of butt-welding ends of piping components to be joined into a piping system by welding. It includes requirements for welding bevels, for external and internal shaping of heavy-wall components, and for preparation of internal ends (including dimensions and dimensional tolerances).Our in-hourse R&D team developed bevel ends equipment are good using in thickness 2mm to 20mm pipe fittings, guarantee high efficiency and high quality. Send us your technical drawingsThese weld edge preparation requirements are also incorporated into the ASME standards (e.g., B16.9, B16.5, B16.34).ASME B16.25 (BUTT WELD ENDS)ASME B16.25 sets standards for the preparation of the ends of components that need to be welded together.

Advantages and Disadvantages of Socket Weld fittings ADVANTAGES 1. The pipe need not be beveled for weld preparation.2. Temporary tack welding is no needed for alignment, because in principle the fitting ensures proper alignment.3. The weld metal can not penetrate into the bore of the pipe.4. They can be used in place of threaded fittings, so the risk of leakage is much smaller.5. Radiography is not practical on the fillet weld; therefore correct fitting and welding is crucial. The fillet weld may be inspected by surface examination, magnetic particle (MP), or liquid penetrant (PT) examination methods.6. Construction costs are lower than with butt-welded joints due to the lack of exacting fit-up requirements and elimination of special machining for butt weld end preparation. DISADVANTAGES 1. The welder should ensure for a expansion gap of 1/16 inch (1.6 mm) between de pipe and the shoulder of the socket.ASME B31.1 para. 127.3 Preparation for Welding (E) Socket Weld Assembly says:In assembly of the joint before welding, the pipe or tube shall be inserted into the socket to the maximum depth and then withdrawn approximately 1/16" (1.6 mm) away from contact between the end of the pipe and the shoulder of the socket.2. The expansion gap and internal crevices left in socket welded systems promotes corrosion and make them less suitable for corrosive or radioactive applications where solids buildup at the joints may cause operating or maintenance problems. Generally require butt welds in all pipe sizes with complete weld penetration to the inside of the piping.3. Socket welding are unacceptable for UltraHigh Hydrostatic Pressure (UHP) in Food Industry application since they do not permit full penetration and leave overlaps and crevices that are very difficult to clean, creating virtual leaks. The purpose for the bottoming clearance in a Socket Weld is usually to reduce the residual stress at the root of the weld that could occur during solidification of the weld metal, and to allow for differential expansion of the mating elements.

What's the standard of steel pipe fittings? Why pipe fittings need standards 1111MicrosoftInternetExplorer402DocumentNotSpecified7.8 磅Normal0 The standardization systems are very important, especially when the  consequences of a product failing are dire–like in an engineering project. The standards help us to know what  we're getting will perform as our expect, and the product won't let us down.Pipe fitting standards said how fittings were designed, how they were constructed, and how they can be expected to perform. Some of the characteristics that pipe fitting standards cover include: SizePressure-temperature ratingsDesignMaterialsCoatingsMarkingThreadingEnd connectionsDimensions and tolerancesPattern taperTypes Of Industrial Pipe Fitting Standards There are a number of organizations that specify pipe fitting standards. Some of the most well-known include: ANSI: The American National Standards Institute This private, non-profit organization coordinates the U.S. voluntary standardization and conformity assessment system. ANSI's ‘schedule numbers’ classify wall thicknesses for different pressures uses. ASME: American Society For Mechanical Engineers  ASME is one of the most respected organizations when it comes to developing standards and codes. ASTM International: American Society for Testing And Materials One of the largest voluntary standards development organizations, ASTM develops and publishes voluntary standards on the basis of materials, products, systems and services. Its standards include pipes, tubes and fittings.

Seamless pipe fittings Characteristics Functions of seamless reducers Carbon steel tees (pipe fittings) are generally used to adjust the valve to facilitate drainage. The concentric reducer facilitates fluid activity and has less interference with fluid flow at the time of variable diameter. The diameter of the two ends of the reducer is different, and it is used to connect steel pipes or flanges of different diameters to reduce the diameter. The two nozzles of the concentric reducer have the center of the circle on the same axis. When the diameter is changed, the orientation of the pipe is unchanged according to the axis. Generally, the orientation of the steel pipe is constant, and it is generally used for gas or straight liquid pipe diameter reduction. The eccentric reducer is internally cut at the ends of the two nozzles and is generally used for horizontal liquid pipes. Standard of Butt welding Tees Butt welding tee is the connections of hot stamping or forging forming of steel plate. The connection method is to directly weld the tee and steel pipe. The main production standards of butt welding tees are generally GB/T12459, GB/T13401, ASME. B16.9, SH3408, SH3409, HG/T21635, HG/T21631, SY/T0510. Related information of seamless Tees Butt welding tees generally have equal-diameter tees, different-diameter tees, etc. The materials are carbon steel, alloy steel and stainless steel. Carbon steel tee When the chromium content of the steel reaches 1.2%, the chromium reacts with the oxygen in the corrosive medium to form a thin oxide film (self-passivation film) on the steel surface. The seamless tee can prevent further corrosion of the steel tube. In addition to chromium, commonly used alloying elements include nickel, molybdenum, titanium, niobium, copper, and nitrogen to meet various applications.

What is the most effective inspection method for seam pipe elbow? X radiation detection There are six main types of defects in the welding process of carbon steel seam pipe elbows: 1 poor fusion: not welded, not fused; 2 crack: hot crack, cold crack; 3 holes: pores, shrinkage holes; 4 inclusions: Slag inclusion, tungsten trapping;5 poor forming: undercut, burn through and welding, etc.; 6 other defects.X Radiation detection mainly detects the first five categories.Radiation detection is one of the important methods of conventional non-destructive testing. It is an important technology to ensure the quality of welding. The test results will be used as an important basis for the analysis and quality assessment of weld defects. The use of computer to analyze and identify the X-ray detection results can greatly improve the work efficiency, effectively overcome the misjudgment or missed judgment caused by the difference in technical quality and experience of the judges and the external conditions in the manual assessment, so that the judgment process is objective. Chemical, scientific and standardized.Radiation detection is only suitable for detecting internal defects in materials or components.

Why does the tee need to do the blasting before painting? Before painting, pipe tees must do the blasting. The blasting process adopt compressed air to form a high speed jet beam, spraying the material on the surface of the tees, make the appearance of tees changes. Due to the impact and cutting from spraying material, the surface of tees will gain some cleanness and different roughness, improving the mechanical properties of tee surface.The quality of blasting will affect the adhesion and appearance of the coating, the moisture resistance and corrosion resistance of the coating. If the blasting not done well, the rust will continue spread under coating, causing the coating falling off. After carefully cleaning the surface, the coating life will be 4-5 times longer than that only simple cleaning.

Production Process of Pipe Tees Tee is one kind of pipe fittings,formed as T-shaped. They are mainly used for change the direction of the flow. Tees are generally installed in the branch of main pipes.Pipe Tees can be used for water pipelines,oil pipelines and various liquid&chemical material pipelines, in the fields of water, oil, natural gas, construction, medicine and other engineering fields.Pipe Tees are produced according to the certain process methods and principles, ensuring good quality in actual use. First, the material was chosen by different tee sizes. Tees are formed by molds.The bottom of the mold is flat and straight, and there is a flange hole on the upper side. The pipe material is placed in the mold with fixed by a hydraulic cylinder, then fill the liquid in the pipe,make the pipe form into a 'T'. Finally, cut the end position to form bevel end.For most tees are used for welding, so the ends are mostly made as bevel end to improve the welding quality. Besides,for export, all the tees must do the surface treatment,including blasting and painting. It would be convenient for long time transportation over seas, avoiding rusting. When packing tees, we generally put smaller tees in larger TEES for saving volume. But for large size, like 24 inch, we will adopt single packing. Meanwhile, marking will be well noted with dimensions, material, heat nos, logos.For over 30 years, JS FITTINGS has been committed to producing high quality steel pipe tees, exporting over 50 countries and get good reputation. And now we still constantly open the international market with the original intention! Always do the best pipe fittings!

How to carry out anti-rust work after production? It has been verified by the research institute that the working life of the anti-corrosion layer depends on the coating type, coating quality and construction conditions. The external surface treatment of the bend affects the life of the anti-corrosion layer by about 50%. Therefore, it should be strictly in accordance with the anti-corrosion layer standard. The requirements for the appearance of curved pipes are explored and summarized from time to time, and the external disposal methods for curved pipes are improved from time to time. Different Rust removal methods 1,  the pipe cleaning Solvents and emulsions are used to clean the surface of the steel to remove oil, grease, dust, smoothing agents and similar organic matter, but it can not remove the rust, scale, flux, etc. of the steel surface, so it can only be used as an adjutant in the production of antisepsis.  2, the tool rust First, use steel wire and other things to polish the steel surface to remove loose or raised scale, rust, welding slag and so on. 3, curved pipe pickling Ordinary chemistry and electrolysis are used for pickling treatment. The anti-corrosion of curved pipe is only chemical pickling, which can remove scale, rust and old coating, and can sometimes be used as re-disposal after blasting and rust removal. Chemical cleaning can certainly bring the appearance to the inevitable cleanliness and roughness, but its anchor pattern is shallow and it is easy to cause pollution. 4, sandblasting and rust removal The jet rust removal is driven by a high-power motor to rotate the jet blades at high speed, so that the abrasives such as steel grit, steel shot, wire segment and minerals can be sprayed on the outer surface of the elbow under the effect of centrifugal force, which can completely eliminate rust, oxide and dirt. And the elbow can achieve the required average roughness under the effect of abrasive impact and friction. In order to achieve the desired descaling effect, the abrasive should be selected according to the hardness of the elbow, the original corrosion level, the required appearance roughness, the type of coating, etc., regarding the single-layer epoxy, two-layer or three-layer polyethylene coating. The inclusion of abrasives with steel grit and steel shots is more likely to reach the illusion of rusting.

why the welding Tees were fracture during working About welding of joints The joint weld seam of the large-diameter butt weld tee is on the intersecting line where the main pipe and the branch pipe intersect, and the shape and position are more complicated than the butt weld seam, and the weld quality is difficult to control during welding. According to statistics, the leakage rate of such welds accounts for 80% of the leakage rate of all process welds. The main defects are not penetration, porosity and slag inclusion. About the bevel ends of tee The weld bevel on the intersecting line is mainly formed by manual gas cutting or plasma cutting. The processing precision is not high, the groove angle is too small, and the welding process parameters are improperly selected, which will result in incomplete penetration. Another main reason for the quality defect of the welded tee is that the process is wrong, the outer groove of the branch pipe is processed into the inner groove, and the branch pipe is directly lapped on the main pipe for welding. Incomplete penetration reduces the strength of the weld. For pipes that transport corrosive media, as the production cycle increases, the heat affected zone of the weld is thinned, resulting in weld leakage. The reason for the generation of pores and slag inclusions is that the oil, rust, moisture and other impurities in the groove and the vicinity before welding are not cleaned, and the skin is not removed during the welding process. In addition, during the welding operation, the welding speed is too fast, and the welding current is too small, which accelerates the cooling speed of the weld. seline" seline"

What's the difference between the butt weld fittings and socket fittings? 1. Connection type： 1）Butt welding connection is to fix all the two parts after spot welding, of course, the welder's requirements are also slightly higher, because the butt welding needs to do 100% RT inspection under strict working conditions, Butt welding connection is common used in chemical oil, electric power, gas and steel industries. 2) Socket welding is to weld the pipe into the valve body for welding, and the shape of the internal thread connection is similar after molding. Generally speaking, carbon steel pipes and stainless steel pipes of 2" or less are used for socket welding. Stainless steel pipes are also used for butt welding below 2", such as flange flange flanges; titanium pipes, duplex steels, nickel bases. Alloys and the like are basically used for butt welding. 2. Difference1) Socket welds form fillet welds, while butt welds form butt welds. It is better to analyze the butt joints from the strength and stress state of the welds than the sockets. Therefore, in the case of high pressure grades and occasions where the use conditions are bad, the form of docking should be adopted.2) Socket welding is generally used for small diameters of DN40 or less, which is economical. Butt welding is generally used for DN40 or above. The form of socket welding is mainly used for small diameter valves and pipe, pipe fittings and pipe welding. Small-diameter pipes generally have a thin wall thickness, are easy to be misaligned and ablated, and are difficult to weld, and are more suitable for socket welding. In addition, the socket of the socket welding has a reinforcing effect, so it is also used under high pressure. However, socket welding also has shortcomings. One is that the stress condition after welding is not good, the welding is not welded, and there are gaps inside the pipe system. Therefore, the pipe system used for crevice corrosion sensitive media and the pipeline system with high cleaning requirements are not suitable. Use socket welding. Furthermore, for ultra-high pressure pipes, even small-diameter pipes have a large wall thickness, and it is possible to avoid socket welding by using butt welding.3) The former must be one big and one small in diameter before it can be inserted into the weld. The latter diameters may be the same or different. 2. The welding groove is different in form. 3 welding process is different. The strength after welding is different.4) Most of the lower pressure grades are smaller socket welds, and the higher pressure grades are often butt welds. Butt welds are 100% tested for flaw detection to ensure no leaks.