Flange Knowledge
Pipe Fittings Knowledge


Differences between seamless elbows and welded elbows

Brief introduction about the classification of steel pipe elbows  Brief introduction about the classification of steel pipe elbows  According to the fluid direction of the pipelines, steel elbows can be divided into different degrees, such as 45 degree, 90 degree,180 degree, which are most common degrees. Also there has 60 degree and 120 degree, for some special pipelines. According to the raw material, the steel pipe elbows can be divided as seamless pipe elbow and welded pipe elbow. Here we’d like to share some knowledge about the seamless steel elbow and welded steel elbow.  The difference between seamless elbows and welded elbows Seamless elbows are made of seamless steel pipes through hot pushing, pressing or extrusion processes, and there are no welds on the elbows.In general, welded elbows smaller than DN600 are made of welded steel pipes, are made in the same process as seamless elbows. But there is a welded seam on the elbows. Welding elbows larger than DN600 are made of steel plates, and there will be 2 welds. If you need the seamless elbows when the size is above DN600, please inform in advance, we can also produce them. JS FITTINGS will show you the difference between seamless elbows and welded elbows in raw materials, manufacturing process, performance, appearance, size, application, cost and price. How to make seamless elbow The production of seamless elbows mainly uses hot pushed technology.The hot pushed elbow forming technology is to use special elbow pushing system core machine, mold and heating device, to set on the mould of billet in pushing forward movement, under the impetus of the machine in motion is heated and hole enlargement and forming process.  The hot pushed elbows have a good appearance, uniform wall thickness and continuous operation, they are suitable for the characteristics of mass production. Thus, the hot pushing technology becomes the main forming methods of carbon steel, alloy steel elbows, and also applied in some specifications of the stainless steel elbows. How is Welded elbow made? The raw materials of welded elbows are welded steel pipes and steel plates. Normally, the elbows’ diameter below DN600 are produced by welded steel pipe. The diameter more than DN600 requires steel plates. The first step of producing the welded elbow is bending the steel plates, then welded into circular. Welded steel elbows have the characteristics of high production efficiency, low cost and saving material.

How do the ASME B 16.9 60 inch pipe elbows be made?

How do the ASME B 16.9  60 inch pipe elbows be made? Methods of produce steel pipe elbows Steel pipe elbow is a kind of pipe fittings used for pipe turning, there are 90 degree elbows, 45 degree elbows and so on. It can be produced according to the engineering needs. Because of the different materials and different pressures, the manufacture process of pipe elbow is also different. So far, steel pipe elbow manufacturers commonly use 4 methods to produce seamless pipe elbows: hot-pushing, stamping,  extrusion and butt Welding. Hot- pushed Pipe Elbows The hot-pushing is a process used to produce seamless pipe elbows, using a elbow-push machine, a core mold and a heating device, the blank sheathed in the mold is pushed to run forward under the elbow-push machine. It’s a process of heating, expanding, diameter, and bending. The deformation characteristics of the hot-pushing elbows are determined according to the law of the metal material remains unchanged before and after plastic deformation. The diameter of the pipe blank is determined when the pipe is adopted. The diameter of the pipe is smaller than the elbow, to thinning out the rest of the body by expanding the diameter. Then the thickness of pipe elbow is uniform. The pipe elbows made by pushing machine have beautiful appearance and uniform wall thickness. The pushing machine is suitable for mass producing. So the main production process of general Carbon steel elbows and alloy steel elbows is hot-pushing which also used in certain specifications of stainless steel elbows forming. Stamped Pipe Elbows The stamping pipe elbow manufacturing process is the earliest application of the mass production of seamless elbow molding process which have been replaced by hot-pushing in common use. However, when the pipe elbow quality is small, some specifications and wall thickness is too thin or too thick , and with other special request, the factory will choose the stamping process. In the forming process, the diameter of blank pipe should be same with the finished pipe elbow, and be stamped into the forming of pipe elbows. Stamping process is divided into cold stamping and hot stamping, we select the manufacturing process according to the material. The stamping process is not as good as hot-pushing, especially the quality and appearance. In the forming process, the elbow outer-arc is in tension. There is no extra material to compensate the outer-arc, so the wall thickness at the outer-arc is about 10% thinner than before. However, due to the characteristics of unit production and low cost, the stamping process is suitable for small batch production of high-pressure thick-wall elbows.

FAQs about cooperation during virus-COVID-19

Statement: Although we are affected by the epidemic, JS FITTINGS ensure all communication will be timely and transparent, working and production environment is sanitation and safety. The high infectivity of the Corona Virus Disease 2019 easily triggers fear and anxiety. CS pipe fittings customers and importers feel insecure about the goods exported from China, when know the news. For most customers' concerns, we give answers here to promote better cooperation with each other. 1. Is it safe to receive a letter or a package from China? Yes, it is safe. People receiving packages from China are not at risk of contracting the new coronavirus. From previous analysis, we know coronavirus do not survive long on objects, such as letters or packages.-----World Health Organization 《Frequently Asked Questions and Answers about 2019-nCoV and Animals》 https://www.cdc.gov/coronavirus/2019-ncov/faq.html 2. Are you working as usual? Until the Feb. 28th, the Foreign Trading Department is working from home. We can quot for new orders and sign contracts. We can receive the prepayment every week. Now, our factory is preparing for resume running. The local government has issued a series of policies to encourage resumption of work. At the beginning of March 2020, all our staff will back to work and the factory start producing. 3. Do you have CS seamless pipe fittings and forged flanges in stock?  We have more than 100 tons CS pipe elbows, pipe tees, pipe reducers, ASME & GOST flanges in the warehouse. However, we will ship according to the time list of prepayment. If you want to get the goods before your competitors and grab more market share, don't hesitate to contact us. We are pleased to help our customers to open a bigger market.   4. Production capacity and logistics status of the carbon steel pipe fittings and flanges. The automatic painting equipment can finish the work of washing, drying, painting and drying in the same time, which can save much time and ensure the output 700-1000 tons per month. All the equipment and production links are match丿with the environmental standards. The logistic will arrange according to the customs' demands. We will book the most suitable routes and confirm with customers before loading. 5. If I place the order today, when can you arrange the loading? We will ship the goods according to the time list of prepayment. Generally, when back to work, we can produce 1 container in 20-30 days, more 10 days 1 more container. If the total quantity is less than 5 containers, we can finish production in 30-40 days. Depending on the items of the order, the production time will be different. All details will be mentioned in the quotation list.  If you have other questions, welcome to contact us directly. Foreign Trade Department: Ms. Lisa WangEmail : admin@chinajsgj.comWhats App: +8618633894868Wechat: JSFITTINGSCHINA

Types of steel pipe flanges

Types of Carbon Steel Pipe Flanges The most used flange types are: Welding Neck, Slip On, Socket Weld, Lap Joint, Threaded and Blind flange. Below you will find a short description and definition of each type, completed with an detailed image. MOST COMMON FLANGE TYPES Welding Neck Flange Welding Neck Flanges are easy to recognize at the long tapered hub, that goes gradually over to the wall thickness from a pipe or fitting.The long tapered hub provides an important reinforcement for use in several applications involving high pressure, sub-zero and / or elevated temperatures. The smooth transition from flange thickness to pipe or fitting wall thickness effected by the taper is extremely beneficial, under conditions of repeated bending, caused by line expansion or other variable forces.These flanges are bored to match the inside diameter of the mating pipe or fitting so there will be no restriction of product flow. This prevents turbulence at the joint and reduces erosion. They also provide excellent stress distribution through the tapered hub and are easily radiographed for flaw detection.This flange type will be welded to a pipe or fitting with a single full penetration, V weld (Buttweld). Slip on Flange The calculated strength from a Slip On flange under internal pressure is of the order of two-thirds that of Welding Neck flanges, and their life under fatigue is about one-third that of the latter.The connection with the pipe is done with 2 fillet welds, as well at the outside as also at the inside of the flange.The X measure on the image, are approximately:Wall thickness of pipe + 3 mm.This space is necessary, to do not damage the flange face, during the welding process.A disadvantage of the flange is, that principle always firstly a pipe must be welded and then just a fitting. A combination of flange and elbow or flange and tee is not possible, because named fittings have not a straight end, that complete slid in the Slip On flange. Socket Welding Flange Socket Weld flanges were initially developed for use on small-size high pressure piping. Their static strength is equal to Slip On flanges, but their fatigue strength 50% greater than double-welded Slip On flanges.The connection with the pipe is done with 1 fillet weld, at the outside of the flange. But before welding, a space must be created between flange or fitting and pipe.ASME B31.1 1998 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.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. The image shows you the X measure for the expansion gap.The disadvantage of this flange is right the gap, that must be made. By corrosive products, and mainly in stainless steel pipe systems, the crack between pipe and flange can give corrosion problems. In some processes this flange is also not allowed. I am not an expert in this matter, but on the internet, you will find a lot of information about forms of corrosion.Also for this flange counts, that principle always firstly a pipe must be welded and then just a fitting.

Differences between steel pipe bends and pipe elbows

Differences between steel pipe bends and pipe elbows Steel pipe bend is a bending pipe that used to change the pipeline direction. It is similar to pipe elbow, but differently, pipe bend is longer than elbow and usually manufactured for the specific needs.So it depends on different bending radius (R) to distinguish bend and elbow.In case the bending radius is more than 2 times of D (diameter), it is pipe bend.In case bending radius in 1D or 2D, it is an elbow. (short radius elbow and long radius elbow). How does the steel pipe bend make? The pipe bend is bent by a set of bending equipment with two processes: Cold simmering and hot pushing. (Including bending, squeezing, pressing, forging, machining, etc) Differences between Steel Pipe Bend and Elbow Pipe bend and elbow both for change the pipe direction, still there are a lot of differences in the below aspects:Bending RadiusManufacturing ProcessesDifferent costApplication scope Bending Radius of Bend and Elbow As we talked above,Steel pipe bend radius: Above 2 times of D, so there are 2D, 2.5D, 3D, 5D, 6D, 7D or 8D pipe bend.Steel pipe elbow radius: R=1D or R=1.5D or 2D. Below 1.5D is a short radius elbow, and more than 1.5D but not over 2D is a long radius elbow.R is the radius of curvature; D is (elbow or bend) pipe diameter. As the above picture, CLR could be in 1D, 1.5D, 2D, 3D, 5D, etc. Different manufacturing processes Bend: Could be bend directly from a finished pipe with cold bending processes, to different degrees.Elbow: Shall be made according to standard manufacture procedures, with hot finishing or hot bending, to a certain degree, 45°, 90° or 180°. Cost different Professional manufacturer of asphalt machines. Our sales and R&D team have over 10 years’ experience to focus on asphalt distributor, synchronous pavement surface vehicles and other road machinery and equipment.  Different applications scope Bend: Compatible with slower liquid and lower pressure.Elbow: Compatible with high pressure and rapid liquid.Sometimes elbows must be used in narrow sections because the radius of curvature of the elbow is small, generally 2D, but the pipe bend could be up to 40D. We supply steel pipe bend with below ranges: Manufacturing standard: AISI B16.49Material: Carbon steel, Alloy steel, Stainless steelMaterial standards: ASTM A234 WPB, WPC, WP1, WP5, WP9, WP11, WP22, WP91; ASTM A403 304/304L, 316/316L.Outer Diameters: 1/2'' to 48''. DN15 to DN1200Radius range: R=2D, 2.5D, 3D, 5D, 6D, 7DDegree range: 45 degree, 60 degree, 90 degree and customized.Wall thickness: SCH 10, SCH 40, SCH80Coatings: Black paint, galvanized, epoxy coated, 3PE, FBE

Advantages and Disadvantages of Socket Weld fittings

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.

Steel Pipe Dimensions - Schedule 80

Steel Pipe Demisions-SCH 10 Internal and external diameters, areas, weights, volumes and number of threads for schedule 80 steel pipesBased on ASTM A53 - Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless. ASTM A53 pipe  - also referred to as ASME SA53 pipe - is intended for mechanical and pressure applications. Can be used in steam, water, gas and air lines. Suitable for welding and forming like coiling, bending and flanging.· 1 in2 = 645.2 mm2 = 6.452 cm2 = 6.452x10-4 m2· 1 ft (foot) = 0.3048 m Related FAQS Steel Pipe Dimensons - Schedule 40Differences between steel pipe bends and pipe elbowsWhat's the features of seamless carbon steel tee fittings and pipe reducers?Industrial Pipe Fittings Standards

Steel Pipe Dimensons - Schedule 40

Steel Pipe Dimensons - Schedule 40 ANSI schedule 40 steel pipes' internal and external diameters, areas, weights, volumes and number of threads. Based on ASTM A53 - Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless. ASTM A53 pipe - also referred to as ASME SA53 pipe - is intended for mechanical and pressure applications. Can be used in steam, water, gas and air lines. Suitable for welding and forming like coiling, bending and flanging.· 1 in2 = 645.2 mm2 = 6.452 cm2 = 6.452x10-4 m2· 1 ft (foot) = 0.3048 m Related RFQS Steel Pipe Dimensions - Schedule 80About JS FITTINGS MS/CS pipe fittingsWhat is the most effective inspection method for seam pipe elbow?How to get the samples of pipe fittings?

ASME/ANSI B16.5 flange and bolt demisions

ASME/ANSI B16.5 Flange and Bolt Demisions Flange dimensions are determined by the pipe size and the pressure class required for the application. Flanges are standardized according publications from organizations like ASME, MSS, API and others. ASME/ANSI B16.5 provides· weld neck flanegs· slip-on flanges· socket weld flanges· threaded flanges· lap joint flanges· blind flangesFlange dimensions for pipes ranging 1/2" to 24" - in classes ranging 150 to 2500. · Steel Pipe Dimensons - Schedule 40· Steel Pipe Dimensions - Schedule 80

What's the features of seamless carbon steel tee fittings and pipe reducers?

What's the features of  seamless carbon steel tee fittings and pipe reducers? Carbon steel tee fittings are generally used for regulating valve devices and used for draining.Concentric reducers  are beneficial to fluid activities and have less interference to fluid flow regimes during reducing diameters.  Seamless tee for liquid and gas pipe, using concentric reducer to reduce diameter. Because the eccentric reducer is flat on one side, it is convenient for exhausting and draining, which is convenient for operation and maintenance. Therefore, the liquid pipeline of the horizontal device generally uses an eccentric reducer.The reducer is also called the size head. The diameters of the two nozzles are different. They are used to connect pipes or flanges of different diameters for diameter reduction. The nozzle of the concentric reducer, the center of the circle is on the same axis, when the diameter is reduced, and the orientation of the tube is calculated by the axis, the orientation of the tube is constant, and 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. Butt welding tee is a steel hot press forming or forging forming elbow. Its connection method is to directly weld the tee and the steel pipe. The main production standards of the butt welding tee are generally GB/T12459, GB/T13401. , ASME B16.9, SH3408, SH3409, HG/T21635, HG/T21631, SY/T0510.

The key step in the production of butt flanges - annealing

The key step in the production of butt flanges - annealing 5 STEPS 1. Whether the annealing temperature reaches the specified temperature. The welding flange treatment is generally a solution heat treatment, which is commonly called "annealing", and the temperature range is 1040~1120 °C. You can also observe through the observation hole of the annealing furnace. The flanged pipe fittings in the annealing zone should be in an incandescent state, but there is no softening and sagging.Second, the welding flange is used to process the water vapor in the casting furnace. On the one hand, check whether the material of the furnace body is dry. When the furnace is installed for the first time, the material of the furnace body must be dried. Second, if there are too many water stains on the flanged pipe fittings entering the furnace, if there is a hole on the flange pipe fittings, do not leak water. Go in, or else destroy the atmosphere of the stove.Third, the furnace body sealability. The soldering flange bright annealing furnace should be closed and isolated from the outside air; if hydrogen is used as the shielding gas, only one exhaust port is open (used to ignite the discharged hydrogen). The method of inspection can be applied to the joint gap of the annealing furnace with soapy water to see if it runs. The place where the gas is easy to run is the place where the annealing furnace enters the pipe and the place where the pipe is discharged. The sealing ring in this place is particularly easy to wear, and often Check frequently.Fourth, protect the gas pressure. In order to prevent micro-leakage on the welding flange, the protective gas in the furnace should maintain a certain positive pressure. If it is hydrogen shielding gas, it generally requires more than 20kBar.Fifth, the annealing atmosphere. For the welding flange, pure hydrogen is generally used as the annealing atmosphere, and the purity of the atmosphere is preferably 99.99% or more. If another part of the atmosphere is an inert gas, the purity can be lower, but it cannot contain too much oxygen or water vapor.

Industrial Pipe Fittings Standards

Industrial Pipe Fittings Standards 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 taper Types Of Industrial Pipe Fitting StandardsThere 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. Welcome to contact us with your BOQ and we can ship globally with short deliver time.

About JS FITTINGS MS/CS pipe fittings

About JS FITTINGS MS/CS pipe fittings  Hebei Jinsheng Pipe Fitting Manufacturing Co.,Ltd. is a manufacturer, stockiest & suppliers of MS Pipe Fittings. About JS FITTINGS MS/CS pipe fittings MS&SS Pipe Fittings have special quality finishing and duress for long life, high pressure and zero defects. The product differentiation is based on the premier finish of JS FITTINGS MS Pipe Fittings with minimum burr at the edge . The JS FITTINGS MS Pipe Fittings with grooved ends for perfect welding and fabrication of the fittings in mega projects in oil and gas industry for long life of the product. Orders of JS FITTINGS are guaranteed fast delivery of the Pipe Fittings in China. The main reason being we have an excellent warehousing and storage facilities for both finished and semi finished MS Pipe Fittings. JS FITTINGS MS Pipe Fittings are made ready as per the urgent requirements of the customers. JS FITTINGS MS Pipe Fittings are packed in plywood case or pallet with plastic wraps. About Surface treatment Surface treatmentThe main surface treatment of JS FITTINGS MS Pipe Fittings is usually carried out by sandblasting, shot blasting, grinding, pickling, etc. The surface of the pipe has been rusted, scratched, etc., and the JS FITTINGS MS Pipe Fittings has a smooth surface to meet the requirements of subsequent processing and inspection. After treating with shot blasting, the surface hardness of the Pipe Fittings will be harder.Surface protectionFor the surface protection of carbon steel and alloy Pipe Fittings, the method of painting is usually adopted, and the method of passivation after pickling is applied to SS steel (for all surface-cut SS steel pipe fittings, it is not necessary to be passivated). The main purpose of pipe surface protection is to prevent corrosion and at the same time achieve the appearance of the product. Usually, our clients put forward specific requirements for the surface protection, and JS FITTINGS completes the protection of the surface of the pipe fittings according to the requirements of our clients.

JS FITTINGS can supply other kind of pipe fittings--Forged Steel Fittings

JS FITTINGS forged carbon steel pipe fittings JS FITTINGS is a leader of quality forged steel fittings of all types; we offer several grades to accommodate your industrial application in the field. We deliver custom forged steel fitting orders on time, and forged steel fittings from your drawings and specifications are our specialty. JS FITTINGS will perform specialized destructive testing (PWHT, Charpy, V-Notch, Hot Tensile) and NDE (Mag Particle, Dye Penetrant/LPI, Ultrasonic) at your request. CouplingsHalf couplingsReducersPipe capsUnionsSoc-o-letsWeld-o-letsThread-o-lets90° socket weld elbowsTeesWe produce high quality forged steel fittings for an array of applications.  Material that JS FITTINGS can supply Carbon steel SA234WPB/C, SA420WPL6, WPL3 Chrome/moly steel SA234, WP5, WP9, WPQQ, WP12, WP22 Stainless steel 304/L/H, 316/L/H, 310, 317L, 321/H, 347/H, 410, 416, 420, 17-4, 440, Alloy 20, E52100 Nickel Alloys steel 200, 201, 400, K500, 600, 625, 800H/HT, 825, X-750, C276, Hastelloy B & C22