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From the structure of the sense, the reducer is also called the short tube, variable diameter tube diameter, diameter changes over, variable diameter, reducing nipple joint, reducing pipe, reducing pipe (Swaged Nipples), shrinkage (necking), bushing, cone tube, and the size of the tapered tube, size head, mouth, la beep mouth or reducing joint (reducing coupling), reducing period, variable diameter section, transition section (transition) or expanding pipe fitting (flared fitting), etc., a total of 20 kinds of names, Reducer and reducing pipe is the standard name, the size of the head is daily. Eccentric Reducer (Eccentric reducers), Concentric Reducer and pipe diameter. The bent pipe diameter is also called reducing elbow, flaring elbow. Reducer three-dimensional entity model of computer modeling method this paper describes the construction of the pipeline accessories reducer classification and ends with straight pipe three-dimensional entity model of the structure of three kinds of common computer drawing method. Skin on a series of circles on the skeleton of the method can accurately describe the structure of the bent pipe diameter, wall thickness and the structure of two end face and the straight pipe end face directly connected joint model of the complete unit can; By the size of the two is cone subtraction can accurately describe the structure of concentric reducer, but the structure of the two ends are connected to the wall thickness of straight pipe should be such as overlapping, and the phase of delivery after deleting the redundant edges to get full joint model; Eccentric reducer wall thickness changes associated with inscribed Angle, regardless of its cross section perpendicular to the axis of the itself or with the control of the axis of the vertical on both ends are not such as wall thickness of the circular, the simple approximate modeling method is directly connected interval is equal to the tube height of two size diameter of straight pipe end. These models are applied to the finite element numerical analysis, for a variety of external load stress distribution of visual display.

Whether stamping elbow, or elbow push system, when its corrosion? How do you detect it corroded? Elbow after corrosion, usually show the elbow pipe wall thinning, a partial pits and pitting. Now bend corrosion detection method is widely used at home and abroad is the method of magnetic flux leakage and ultrasonic test. (1) the method of ultrasonic ultrasonic testing technique is to use ultrasonic pulse reflection principle to measure the thickness of pipe wall corrosion after. Detection will launch ultrasonic pulse probe perpendicular to the elbow wall, probe first received by the inner surface of tube wall reflection pulse, then ultrasonic probe will receive from the reflection of the surface outside wall pulse, the pulse and the distance between the internal surface reflection pulse spacing reflects the thickness of tube wall. (2) the method of magnetic flux leakage magnetic flux leakage method is based on the basic principle of the high permeability of the properties of ferromagnetic materials, elbow corrosion defect of permeability is far less than the permeability of elbow, elbow in the applied magnetic field under the action of magnetized, when no defect of the bend, for the most part lines by steel tube, the lines of magnetic force uniform distribution; When bend internal flaws, the lines of magnetic force bent, leaking pipe surface and a part of the field lines. Escape detection by magnetization bend surface of magnetic flux leakage, can determine whether defects exist.

The difference between the stainless steel elbow and stainless steel bend as the name suggests is essentially the difference between “head” and “tube”, but in the production process is very different. The most basic is the difference between the stainless steel elbow and stainless steel bend relatively short. R = 1 to 2 times in the stainless steel elbow, multiples is called again big bend. Cold bending tube can be used in the manufacture craft in ready-made straight pipe with pipe bender bending, one-time completed without secondary anticorrosion. But the elbow to the factory customized, do anti-corrosion, ordering cycle is long. Elbow higher than bend but price is much higher than bend, not do the anti-corrosion treatment of damaged is known to ccba bend, but its because cheap in some demand is not high engineering use very much. Elbow manufacturers custom-made, anti-corrosion, ordering cycle is long. Cold bending tube can use ready-made straight pipe with pipe bender bending. One-time completed without secondary anticorrosion. Cold bending pipe construction technology has a oil standard, west-east gas with the enterprise standard. But open area with elbow bent pipe is ok, only consider the cost, elbow to be roasted, cold bending can be bended tube elbow high cost, of course. Sometimes narrow area must turn the elbow, such as regarding the section of pipeline, because of smallstainless steel bend radius of curvature, generally for the 6 d, and stainless steel bend for 40 d.

Stainless steel tee on both ends of the direction of the straight line with the diameter of one end of the vertical bifurcation for small diameter, for small diameter pipe connection. Tee pipe fittings can be pided into square edge, round edge and endless. Tee, reducing tee pipe fitting surface is pided into hot dipped galvanized, electric galvanized, galvanized three categories, and black tee. Tee products are reducing tee 130 r, oblique tee, Y type tee, 165, the groove tee, mechanical tee, equal tee, and other three products, specifications by 1/2-6, has good mechanical properties, uniform surface gloss, geometry size precision, antirust capability is strong, can meet the requirements of interchangeability, convenient installation, long service life, environmental protection, the recovery rate of 100%. Sloper and reducing tee for standard parts, usually outside diameter are Ⅰ series and Ⅱ series, if nominal dimension for DN150x100, outer diameter for Ⅰ series, the wall thickness of grade Sch20, material for 20 # concentric sloper mark it as DN150x100 Ⅰ Sch20-20 R (C) GB/T12459. According to GB/butt welding tee T12459 logo, such as DN100X100X80. According to GB/socket welding tee T14383 identifier, such as DN20X15.

Reducing tee processing method is: in the pipeline for processing and reducing tee marks, and will play in marker. Special equipment: reducing tee at the top of the pipe on the device, the device includes a metal, transformer, commutator, bracket, etc.; Metal bar is heated, the use of jacks and metal bar ejection, outward wall material nature out of the formation of a reducing tee blank; Then a certain length corresponding specification section welding on the reducing tee blank of ejection forming, produce the final product. The reducing tee processing method adapted to different specifications of the pipes on the reducing tee pipe fittings processing; The special processing equipment, simple structure, low cost, manufacturing reducing tee pipe don’t need another injection molding machine and injection molds, can reduce the production cost of this kind of pipe fittings, improve production efficiency.

Flange is a kind of disc parts, flange are used in pairs, the most common in pipeline engineering. In pipeline engineering, the flange is mainly used for pipe connection. In need of connecting pipes and all kinds of installation of a flange, the low pressure pipe flange can use silk, the use of more than 4 kg pressure welding flange. When water pump and valve, and pipe connection, the local equipment, also made the corresponding flange shape, also known as flange connection. Where there are two surfaces in the surrounding use of bolt connection closed connection parts at the same time, generally referred to as the “flange”, such as ventilation pipe connections, this kind of parts can be called “flange parts”. But this connection is only a partial equipment, such as flange connection and water pumps, not good called the pump flange parts “. Relatively small, such as valve can call “flange parts”. In pipeline engineering, the flange is mainly used for pipe connection. In need of connecting pipes and all kinds of installation of a flange, the low pressure pipe flange can use silk, the use of more than 4 kg pressure welding flange. By sealing point between two pieces of flange and bolt fastening. Different stress of flange bolts with different thickness and use different.

Equal tee beautiful shape, the surface level off is smooth, acid and alkali resistance, corrosion resistance, simple sense strong performance. Welding such as diameter stainless steel tee forging is excellent, smooth surface, acid and alkali resistant high temperature resistant, reasonable prices, good appearance, texture performance is strong. Equal tee specifications: DN10-6. Equal tee in different fields widely used and the promotion, in different industries show good product performance and advantage, play an important role. Equal tee appearance is smooth, have good aesthetic feeling and simple sense, let users in the use of good feeling, won’t produce the feeling of disgust. Reducing tee is a head and a small branch pipe, obviously, the size of the two big is competent, indirectly from a small size is manifold. This tee to make standard classification can be pided into the national standard, the electric standard, water standard, American standard, Germany standard, Japanese standard, the standard and so on. By producing method can be pided into the system, pressing, forging, casting, etc. Meet the national standard, electricity, water standard, American standard, Germany standard, Japanese standard, the standard and so on. To the material pided into carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, PPC, etc.. In pure oxygen pipeline, generally is stressed, the more active oxygen; Impurities such as using the reducing tee, as long as the tube in the oxygen flow moves, because the pipe diameter change, flow rate changes may cause debris collisions with the pipe produced by fire or for velocity variation is produced with electrostatic discharge, are likely to cause fire in the pure oxygen tube. High pressure tee – oxygen mixed gas as fuel to natural gas, use gas flame heating tile shape circle tube billet heating, and then on the special equipment of billet hot push and pull a molding technology, the new process is especially suitable for application in natural gas source of construction unit. Stainless steel screw high-pressure tee forging is excellent, smooth surface, acid and alkali resistant high temperature resistant, reasonable prices, good appearance, texture properties. High pressure tee is widely used in water conservancy electric power, food, beer, dairy production, etc.

Other names: head, plug, LIDS, pipe cap, stop. Purpose: welding on the pipe end or installed outside the pipe thread to cover wall pipe fittings. Use closed pipeline, function the same as the tube wall. Stainless steel pipe cap including convex stainless steel pipe cap, conical shell, variable diameter section, the design of the flat cover and tighten. Convex stainless steel tube caps include: hemispherical stainless steel tube cap, oval stainless steel tube caps, disc stainless steel pipe cap. From the standpoint of stress, convex stainless steel pipe cap in the gradually from hemispherical stainless steel tube cap is not good, but look from the manufacturing difficulty, good manufacture gradually. Pipe cap parameters: 304 l stainless steel: 304 316 316 l, 321, 2520, 310, 316, such as material. Size: DN15-48 “) wall thickness: SCH5 – SCH160 standard: ASME DIN JIS BS GB/T, JB SH HG USES: water, beverages, beer, food, petrochemical, nuclear power, chemical fertilizer, shipbuilding, machinery, medical equipment, waterproof processing, pipes, etc. Packing: wooden box, carton service: provide technical advice, installation guide disc, such as stainless steel pipe cap r, avoid joining together, will be thinned and high stress. Splice weld direction when asked to only allow is radial and ring. After large stainless steel pipe cap may cancel this request. Stitching distance requirements, for more than 3 g, and not less than 100 mm (welding heat affected zone is high stress zone, and in the chemical composition of the area will be a loss. So to avoid the high stress area, the area and thickness. According to the practical experience, the stress attenuation length is greater than 3 g, and not less than 100 mm). But refrigeration equipment is difficult to meet the requirements, has its particularity. The butt welds joining together after forming the head, should be 100% rays or ultrasonic testing, the qualified level with the equipment shell. Finally forming the same welding seam detection level, scale and equipment shell, high waste.

According to the different levels of stress, butt welding flange gasket also have different material, from the low pressure asbestos pad, high-pressure asbestos pad to metal pads. Development of butt welding flange in the actual production and used in different ways and process of production and the production, according to the process and principle, and have important value and role of different, in the actual production to add some elements increase the features and value of carbon steel flange, do well the use of the characteristics and value. Flange connection is convenient to use, can withstand greater pressure. In industrial pipe butt welding flange connection is widely used. Within the family, pipe diameter is small, and it is low voltage, invisible butt welding flange connection. If in a boiler room or production site, the flange connection of pipes and equipment are everywhere. 1, the pipeline of pipeline connection and keep the sealing property; 2, easy to change line a long period; Carbon steel or carbon steel, carbon content WC is less than 2% of the iron carbon alloy. Carbon steel in addition to carbon generally contain small amounts of silicon, manganese, sulfur and phosphorus. 3, easy to disassemble pipeline; 4, easy to pipeline closed a long period. Japan’s butt welding flange industry history for more than half a century, during which underpins the machinery industry in Japan and has made great contributions to the economy of Japan. Japanese forging forging association and Japan institute of technology in June of 2002 will be consolidation, its purpose is a member of the two organizations to strengthen the organization and its functions, make them more efficient operation. So will can strengthen service for members, in order to conform to the trend of the modern, with international forging industry. Mainly refers to the mechanical properties of butt welding flange depends on the carbon content in steel, and generally do not add a lot of alloy element in steel, sometimes referred to as the carbon steel or carbon steel. Alloy steel carbon steel tee, flange, reducer, such as the high school low pressure pipe fittings with today’s domestic and international first-class production equipment, testing equipment and a variety of specifications of the pipe elbow flange forging heat treatment line of cold forming hot push-pull forging machine such as a variety of complete technology company also has a wide range of testing equipment such as nondestructive flaw detection of chemical analysis and metallographic examination physics experiment etc. Strong technical force can produce American standard, standard gb standards of various specifications of the stainless steel flange, tee, reducer, etc. Series of products are chemical state power corporation designated as fixed-point collaborative manufacturers.

Elbow use and installation purposes: elbow for the connection of the pipe bend. Connect two pipes with the same nominal diameter, and make the pipe to make the angle turn. Material pision of carbon steel elbow, cast steel elbow, alloy steel elbow, stainless steel elbow, copper elbow, aluminum alloy elbow, etc.. Elbow can be said to cover the use of all walks of life, small to large household enterprises. Each elbow has its own advantages and uses, sincerely welcome new and old friends to come to buy. Elbow is commonly used in pipe installation of a connecting pipe, for the connection of the pipe bend. Other names: 90 degree elbow, right angle bend, love and bending, etc.. Wear-resistant elbow can be favored by the market and continue to replace some of the traditional wear-resistant materials, the root cause lies in its excellent product quality, as well as in the traditional wear-resistant materials and materials. In order to obtain the performance influence of the upstream elbow on the performance of the inner cone flowmeter and the length of the shortest straight pipe, the numerical simulation of the 90 mm diameter and equivalent diameter ratio 0.45/0.65/0.85 was carried out. Simulation medium is often warm water, Reynolds number range: 0.498 * 105 ~ 4.98 * 105, the research program is pided into two types of the baseline and the upper reaches of the single 90 degree elbow, a total of 15 groups. Based on the relative error of the average outflow coefficient and the main evaluation criteria of the installation condition, the length of a straight pipe with a single 90 degree elbow is presented and compared with the foreign research results.

In the atmospheric corrosion resistance, if is the industrial atmosphere or heavy pollution area, you will need to clean in time to avoid the corrosion. Flange suitable for use in food processing, storage and transportation. High pressure equipment and pipeline, using 10 copper, aluminum, steel, stainless steel type lens or other shaped metal gasket. Flange in the use of specific areas show important performance and value, fully grasping the use of specific operations and contribution, ordinary is suitable for the occasion of temperature below 120 ℃, Pressure is lower than 5 mpa, for general corrosive medium, the most commonly used is acid-proof asbestos board. High pressure washer and sealing surface contact width is very narrow (line contact), processing with gasket sealing surface roughness is higher. Polyurethane whether or heat-resistant steel, stainless steel plate shape the best comprehensive properties of steel, austenite have enough strength, and has excellent plasticity and hardness is not high also, this is also one of the reasons they are widely used. Pneumatic actuator is a kind of can produce plastic deformation, and has certain strength rings made of materials. Valve pressure testing machine most gaskets from non-metallic plate cutting, or produced by professional factory in accordance with the provisions, the size, the material of asbestos rubber sheet, asbestos board, PE board, etc.; Another with steelskin belt with asbestos tape winding of spiral wound gasket. Different stress of flange bolts with different thickness and use different. Flange there two surfaces in the surrounding use of bolt connection closed connection parts at the same time, but this connection is only a partial equipment, such as flange connection and water pumps, not good called the pump flange parts “. The LED fluorescent lamp austenite size stainless steel with the vast majority of other similar metal materials, its tensile strength, yield strength and hardness, as the temperature of the lower and higher; The plastic is decrease with temperature decrease. Photoelectric switch, pump and valve in and pipe connection, the local equipment, also made the corresponding flange shape, also known as flange connection. Pneumatic valve is also useful to sheet metal (tin, stainless steel), such as asbestos made of nonmetallic material wrapped package metal gasket; Low-voltage standard small diameter wire connect flange, high pressure and low pressure of large diameter used welding flange, the thickness of the flange and the connection of different pressures are different, such as flange and bolt diameter and quantity of water pump connection, not good called the pump flange parts “.

How to adjust the weld gap is an important step in stainless steel welded pipe production, such as the gap is too large, resulting in a decrease of proximity effect, eddy heat is insufficient, the joint between the weld crystal bad and incomplete fusion or cracking; Gap is too small to cause proximity effect increases, the welding heat is too big, cause the burning of the weld; Or weld after extrusion, rolling the deep pit formation, affect the surface quality of the weld. The torch in stainless steel welding control processing has a wealth of experience, the following will introduce for everybody four effective way to control the weld gap. 1, the welding temperature control Welding temperature is mainly affected by high frequency eddy current thermal power, as long as change the capacitance and inductance of loop or voltage and current can change the size of the excitation frequency, so as to achieve the aim of controlling the welding temperature. For low carbon steel, welding temperature control in 1250 ~ 1460 ℃, the wall thickness 3 ~ 5 mm penetration can meet the requirements. In addition, the welding temperature can be accomplished by adjusting the welding speed. 2, the control of extrusion Two edges of tube billet heating to welding temperature, under the extrusion of squeezing roller, forming a common metal grain interpenetrate, crystallization, eventually forming solid weld. If the extrusion pressure is too small, the amount of common crystal small, weld metal strength drops, stress produces after cracking; If the extrusion pressure is too large, will make molten metal being squeezed out of the seam, not only reduce the weld strength, and can produce a large number of inside and outside burr, even cause the welding seam defects such as. 3, high frequency induction coil position control High frequency induction coil should be close to squeeze roll as far as possible. Located away from the squeezing roller, induction coil, if effective heating time is longer, heat affected area is broad, weld strength; On the other hand, the lack of weld edge heating, bad after extrusion molding. Impedor is a magnet for or a compound tube, the impedance of cross-sectional area should not be less than steel pipe diameter usually 70% of the cross-sectional area, its role is to make the induction coil, steel pipe weld edge and magnet form a electromagnetic induction loop, proximity effect, eddy heat concentrated near the steel pipe weld edge, the tube billet is heated to the welding temperature. Impedance for a drag in the tube billet steel wire, the center should be relatively fixed position in the center of the close to squeeze roll. Powered on, due to the steel pipe billet rapid movement, impedance device by pipe wall friction loss is bigger, often need to change.