Langfang DingYang

Some Problems That Can Not Be Ignored When Using Carbon Steel Flanges in Pipes

fittingflange | 12 October, 2018 16:16

Carbon steel flange in the pipeline when there are many problems need special attention, can not be ignored. If the pipe is very wet, we must pay attention to, because too humid environment may lead to carbon steel flange rust phenomenon, will greatly reduce the performance of carbon steel flange, can not reach the normal use effect. Carbon steel flange in pipe fittings in the use of the following considerations include the following aspects, first of all, we do not put carbon steel flange in a humid place, because carbon steel and water will rust for a long time, the surface will be changed, mechanical properties will be changed accordingly, which gives us the use of trouble, so we want to Try to avoid, and then we pay attention not to use hard things to impact the carbon steel flange itself, so that the surface of the carbon steel flange out of the scars, if serious damage to the sealing surface will make the future seal is not very strong. Carbon steel flanges are used in Building valves of cathodic protection pipeline networks and buried pipe valve wells requiring potential segregation. The cathodic protection situation of the buried pipeline network can be clearly grasped by segmented (area) isolation; the cathodic protection segmented (area) can be evaluated and processed according to different cathodic protection conditions; when the protection potential of the adjacent patches (area) is the same (or similar) and meets the protection potential requirements. The two sides of the insulating carbon steel flange can be connected by spans for unified protection; when the protective potential of adjacent sheets (zones) differs greatly and the sheets (zones) can not meet the requirements of the protective potential, the sheets (zones) that can not meet the requirements of the protective potential can be specially treated until they meet the requirements, and then the sheets can be connected to run. Carbon steel flange in the pipeline use process must pay attention to the above problems, so that not only can achieve the normal practical effect, but also to avoid shortening its service life.

Characteristics of Seamless Carbon Steel Tee

fittingflange | 09 October, 2018 14:03

The carbon steel butt welded tee is usually used for the installation of the regulating valve. Concentric reducer is favorable for fluid flow, and has less interference with fluid flow when changing diameter. Seamless tee so that gas and vertical flow of liquid pipes use concentric reducer. The eccentric pipe with different diameter is flat on one side, which is conducive to exhaust or discharge, and is convenient for start-up and maintenance. Therefore, the eccentric pipe with different diameter is usually used for horizontal installation of liquid pipes. The different diameter pipe is also called the big and small head, the two ends of the pipe mouth diameter is different, used to connect different diameters of the pipe or flange for diameter change. The two ends of a concentric pipe with different diameters, the center of the circle is on the same axis. When the diameter is changed, the position of the pipe will remain unchanged if the axis is used to calculate the position of the pipe. The two ends of the eccentric reducer are cut inside the circumference of the pipe, and are generally used for horizontal liquid pipes. Butt welding tee is a steel hot-press forming or forging forming elbow, its connection form is directly butt welding tee and steel pipe . The main manufacturing standards of stainless steel butt welding tee are generally GB / T12459, GB / T13401, ASME B16.9, SH3408, SH3409, HG / T21635, HG / T21631, SY / T0510. The butt welding tee usually have equal diameter tee, different diameters three links, etc. the materials are carbon steel, alloy steel and stainless steel. When the content of chromium in the steel is about 1.2%, a very thin oxide film (self-passivation film) is formed on the surface of the steel by the interaction between chromium and oxygen in the corrosive medium. Seamless tee can prevent the further corrosion of the steel matrix. Besides chromium, the commonly used alloying elements are nickel, molybdenum, titanium, niobium, copper and nitrogen to meet the needs of concentric use for various purposes. Requirements for the structure and properties of different diameter pipes. A certain production and processing technology is adopted in the production of straight-sealed three-way concentric different diameter pipes to ensure that good effects and properties can be displayed in the production and processing. Weak corrosive medium such as air, steam, water, acid, alkali, salt and other chemical corrosive medium corrosion resistant steel of concentric pipe with different diameters.

What Is The Welding Procedure for Flanges?

fittingflange | 07 October, 2018 11:38

Necessary equipment and tools for manual welding equipment, a handle type corner mill, an electric pneumatic hammer, a flat ruler. Prepare to check and debug the equipment before welding to ensure the normal operation of the equipment; prepare 4.0J402 electrode to dry at 300 350 C for an hour. The assembly of the welding process assembles the vertebral body and the large flange according to the drawing requirements, and then divides the large stainless steel flange into eight equal parts on average. Because the alloy steel flange is thicker, the groove is larger, so the segmental symmetrical, multi-layer welding is adopted. The weld quality requires at least the strength of the weld metal. The surface of the weld is smooth and smooth, and has no defects such as burn through, porosity, welding leakage, slag inclusion, undercut and incomplete welding. The remaining height is less than 2mm.

Flange Manufacturers Link Way Diversification

fittingflange | 15 September, 2018 16:39

Flange manufacturers usually have flanges with different diameters at the top and bottom, generally smaller than the bottom. They can provide better pressure at a relatively fixed height, especially when they can "retract". Flange manufacturer aims to provide a near constant strain rate of flange and a solid height below a normal flange. Each flange uses a variable pitch to achieve a constant alloy steel flange rate and pipe, deflecting the course of rotation to provide a solid height equal to about two line diameters. Flange manufacturers have some uses as follows: to react to the tension of a steel wire flange by pulling the elongated end and body shapes to provide resistance and return to its tightly wound shape. This type of resistance is why flat welded flanges are used in everything from hardware curtain doors or scales to even garage doors closed. Winding: torsional flanged piping with tight or loose parallel port. They should not be tightly wound together with pipes. The initial tension of the flanged flange is not uniform, so it is difficult to test accurately. The space between 20% and 25% of the thickness of the wire is ideal. Swirl: the rotation of pipes should comply with the regulations. The flanges in the unwinding direction cause high stress and early failure. When the flange rotates, the past longitudinal axis which is the correct direction line to the flange rotation, the need to follow the angle similar to the thread bolt or screw clockwise direction or angle of the pipe, otherwise left-handed. Flat welded flanges can be manufactured to suit different loads, applications, or specific conditions by changing the pipe size, line size, or even the length of the flange. Self-designed flanges have always been problematic. Flange manufacturers can provide a lot in a fairly short turnaround time, but may not always be able to provide the customization needed to best suit your product or application. In the past many custom carbon steel flange manufacturers were small enough to make custom flanges, but were unable to provide fast turnaround or consistent quality. Small Solid Height: Butt welded flanges can be designed to fit each moving pipe into the next pipe, so the height of the solid can be equal to the thickness of one or two conductors. This is very useful, and the height of the solid is limited. Floating Rate: These flanges provide constant, uniform spacing and increase strength, speed, rather than a constant force rate (periodically compressed flange). Larger pipes gradually start to exert force at the bottom. A variable pitch can be designed, if desired, to achieve uniform speed.

International Flange Standard System

fittingflange | 04 September, 2018 15:20

There are two main international standards for pipe flanges: European flanges and pipe fitting system represented by German DIN (including the former Soviet Union) and American pipe flange system represented by American ANSI pipe flange system. In addition, there are Japanese JIS pipe flanges, but in petrochemical plants generally used only for public works, and the international impact is small. This paper briefly introduces the pipe flanges of different countries as follows: 1. European system pipe flanges 2 represented by Germany and the former Soviet Union, American system pipe flanges 3 represented by ANSI B16.5 and ANSI B 16.47, and British and French pipe flanges 2, respectively. To sum up, the international standard of pipe flange can be summarized as two different and non-interchangeable stainless steel flange systems: one is the European pipe flange system represented by Germany, the other is the American pipe flange system represented by the United States. IOS7005-1 is a standard promulgated by the International Organization for Standardization (ISO) in 1992. The standard is actually a pipe flange standard which combines two sets of pipe flanges from the United States and Germany.

Future Trend of High Pressure Fittings

fittingflange | 31 August, 2018 13:58

Future Trend of High Pressure Pipe Fitting Stamping elbow has the characteristics of hygiene, processing, high temperature resistance and anti-ultraviolet radiation. It is a new material with high added value. The stamping stainless steel butt welded elbow pipe has the advantages of smooth inner wall, small heat medium flow resistance, acid and alkali resistance, long service life and easy installation. The heat conductivity of stamping elbow used in floor heating requires good heat conductivity, low temperature heat shock resistance and low temperature impact resistance. During winter construction, the pipe is not easy to be impacted and ruptured, which increases the flexibility of construction arrangements and environmental protection can be recycled, without polluting the environment. However, it will cause secondary pollution if it can not be recovered, and there are problems such as controlling crosslinking degree and crosslinking uniformity, etc. The processing is complex and directly affects the performance of the pipe. Stamping elbow has long-term compressive performance in performance, only from the design stress, stamping elbow compressive performance is the best. However, due to various factors, the actual wall thickness of the floor heating pipe is usually 2mm. Under this wall thickness, all kinds of pipes can meet the requirements of floor heating. Pressure resistance advantage of punched carbon steel butt welded elbow pipe can not be reflected. Modern pipe features: LTHS advantages; can withstand strong impact advantages; smooth surface; semi-permanent service life (China and Korea certification service life of 100 years); outstanding flexibility at high temperature and low temperature; hot fusion and renewable use; when used as tap water pipeline can meet sanitary requirements: environmental protection The high-pressure fittings plant has stabilized since the dangerous months before, reversing losses at the compressor plant after a period of layoffs and stock of fittings. After a period of operation, the factory absolutely matched the workers and implemented the system of competition. Rumors of disadvantage to factories have also been circulated during the preceding panic-stricken transitional period, and the military will have to be stabilized to avoid unnecessary trouble. With training to improve the skills and quality of the entire factory staff, lay a good foundation for the future.

Matters Needing Attention for Elbow Manufacturers to Make Alloy Elbow

fittingflange | 29 August, 2018 17:34

Stainless steel elbow manufacturers in the production of alloy elbows to understand the impact of the advance rate on the number of elbow shape: the advance rate as an important process parameter, indirectly controlled by hydraulic system flow conditioning. The rate of advance is fast and production rate is improved, but the thinning rate of wall thickness is increased. In the discussion section of double clamping, the sealing ring will not be affected when the pipe is bended and deformed by external force. The advanced products of the function, goal and degree of skill of alloy elbow pipe fittings clamping connection are introduced. Set up machine protection installation to avoid injury to hands. The smaller the ratio of elbow wall thickness to section diameter D is, the better the bonding function of the die is, but the more casual the inner arc of the elbow is, the more unstable and wrinkled it is. The usual allowance is elbow to 10% to 20% of wall thickness. According to the characteristics of metal volume stability during plastic deformation, wall thickness stability (actual slight thinning), elbow outer arc length and tube blank length equal. Influence of raw material, wall thickness and outer diameter of blank for pushing elbow on the shape of pushing elbow The technological parameters of how many shapes of pushing elbow are as follows: the raw material of pushing blank, the raw material of mandrel head, the wall thickness and outer diameter and shape, the heating temperature and its dispersion and pushing speed. The certain principle of the advance rate is that the principal compressive stress of the inner wall of the elbow is less than the compliance limit of the material at this temperature, and the elongation of the outer wall of the elbow is less than the maximum elongation of the material at this temperature. Considering the safety and service life of alloy steel elbows, the key points should be put on improving the resistance, impact resistance and wear resistance of pipeline lining, so that carbon steel butt welded elbows can be used in power, mining, metallurgy and other occupations, and the transportation, import and use of materials. Considerable pressure can be suffered in short distance and low pressure transportation. The heat transfer coefficient, permeability and intermediate frequency power of the material are large, and the propulsion rate is fast.

Spinning Process of Stainless Steel Pipe Fittings

fittingflange | 25 August, 2018 15:39

With the development of spinning technology, spinning process has gradually replaced traditional process to produce stainless steel forged pipe fitting . Western developed countries have adopted technical blockade on China's technology. Therefore, our research goal is to achieve the ultimate reduction of stainless steel pipe spinning, stainless steel pipe diameter increased to 800mm. And the development of the corresponding specifications of the strong spinning equipment, the realization of large diameter stainless steel pipe production technology localization. Stainless steel pipe fitting are mainly used in aerospace and ordnance industries. One of the most important advantages of metal spinning process is that it can make integral seamless rotary hollow parts, which eliminates the defects of discontinuity, strength reduction, brittle cracking and tensile stress concentration related to welds. Based on the above force parameters, the structure of the powerful spinning machine is designed. The structure of the spinning wheel seat of the spinning machine is compared and the final scheme is determined. The axial feed system and the radial feed system are designed. The kinematics analysis of the transmission parts of the spindle structure is carried out. The newly designed unloading device is introduced in detail.

China's Stainless Steel Pipe Fittings Industry Is Developing Rapidly and Widely Used

fittingflange | 21 August, 2018 14:31

With the rapid development of China's economy, all walks of life have achieved fairly good development. Competition in the stainless steel pipe fittings market is also increasing, as a downstream industry in food, pharmaceutical processing and packaging industry, the impact of stainless steel pipe fittings is also increasing. Stainless steel pipe fitting originated in 1980s, and is a new industry. After 20 years of exploration and exploration, it has begun to take shape. Stainless steel pipe fittings are a kind of pipe fittings, mainly made of stainless steel. With the development of economy, the application range of stainless steel pipe fittings is more and more extensive. The analysis of corrosion resistance of passivation layer on stainless steel surface, combined with advanced production technology and equipment application, the stainless steel clamp produced not only meets the daily production and living needs, but also fills the domestic blank. In the past ten years, with the rapid development of China's macro-economy, the stainless steel pipe fittings industry in China has developed rapidly. Stainless steel threaded pipe fitting are more and more popular in life and industrial applications because of their environmental protection and safety, playing an important and irreplaceable role. There is bound to be fierce competition in the huge market. Over the past few years, there are too many enterprises in the industry, and the competition in product sales is too intense. Now society is an era of information explosion. It is unavoidable for enterprises to encounter competitors in their products. Competition exists in the industry, which is a good thing for some enterprises. Because of competition, companies improve product quality and service quality, and consumers get better or more consumption and services with less money. While the industry is developing and advancing, the market is also winning the competition in the industry. For some competitive large enterprises, through competition, the scale of enterprises becomes larger and larger, and the popularity becomes higher and higher. With the rapid development of the stainless steel forged pipe fittings market in China, the application and R&D of its core production technology will become the focus of attention of enterprises in the industry. Stainless steel pipe fittings manufacturing enterprises want to occupy a favorable position in the market, it is necessary to constantly explore new application areas, strengthen brand upgrade, in order to cope with fierce competition.

An Important Part of Pipe Fitting Manufacturing

fittingflange | 09 August, 2018 17:29

The heat treatment process of butt welded pipe fitting is an important part of pipe fittings manufacturing. Through the heat treatment steps of heating, heat preservation and cooling, the processing hardening, residual stress and metal deformation defects produced in the forming process are eliminated, and the metal structure and properties of the tubes after forming are changed, the state before the deformation processing is restored or the performance is improved and raised. The commonly used heat treatment equipment is a reverberatory furnace, electric furnace, and so on. The usual control mode is that the thermocouple in the furnace is connected to the control device of a temperature time automatic recorder through a sensor. There are different regulations for heat treatment in different product standards. Not all deformed tubes are heat-treated. Usually, when the final forming temperature is not less than 723 degrees C (recrystallization temperature) for a tube of low carbon steel, the heat treatment can not be done, because the final state of the tissue is basically a normalizing state under this temperature, below this temperature or higher than 980. Heat treatment should be carried out; heat treatment of alloy steel or stainless steel pipes, whether cold or hot forming, should be carried out.

Forming Characteristics of Flange Parts

fittingflange | 03 August, 2018 10:16

In order to avoid the flange type axisymmetric parts cracking in extrusion and improving the forming limit, the traditional hot extrusion process is considered, and the radial local loading is provided to change the stress state in the process of stainless steel flange deformation and improve the plastic deformation ability. In the actual forming, the side slider is mainly used to contact the blank, and the radial loading is provided by connecting the hydraulic transmission device with the side slider. In the process of blank extrusion by punch, the blank is subjected to radial pressure at the same time. Under the condition of lateral pressure holding, the plastic deformation of carbon steel flange zone is increased. The most important thing for stainless steel is to keep its surface clean. Once it has been corroded, the surface of the stainless steel will change its appearance, not so clean. So those that have the ability to corrode stainless steel must be kept away from production. Whether acidic or alkaline gas or liquid, keep away from the production environment.

Problems Needing Attention in Using Stainless Steel Pipe Fittings

fittingflange | 28 July, 2018 16:20

For users, it is not only necessary to pay attention to the selection and purchase of stainless steel pipe parts at the purchase stage, but also ensure that the quality and applicable butt welded pipe fittings are purchased. It is also necessary to operate in accordance with the correct process and method when installing piping parts, so as to ensure that the piping parts achieve very good installation results. In addition, we need to pay attention to the following problems in the process of using the pipeline, so as to optimize the use effect of the pipeline, so as to ensure that the pipeline has a good application effect. Question 1: Pay attention to the structural state of pipe fittings. In the process of using stainless steel pipes, we should pay attention to the structural state of the pipes and see if there are cracks in the structure of the road parts. If they are found to have such phenomena, it is necessary to repair the pipes in a timely manner. If it can not be repaired, it is necessary to replace the new threaded pipe fittings . Problem 2: Pay attention to the installation status of pipeline fittings. In view of the normal use of stainless steel pipe fittings, not only the normal structure state is required, but also the installation state is completely correct. Therefore, in the process of using piping parts, we should also pay attention to the installation status of the road parts, and make timely adjustments when they are in poor condition. Use problem three: use correctly. The use of stainless steel pipe fittings is also like the use of many other products. You need to ensure that you use them correctly and your performance will be very good.

Non Corrosion Factors of Stainless Steel Flanges

fittingflange | 25 July, 2018 17:21

Stainless steel flanges will not corrode, pitting, rust or wear. Stainless steel is also one of the most powerful materials for building metal materials. Because stainless steel has good corrosion resistance, it can make structural components permanently maintain the integrity of engineering design. The chrome stainless steel stamping flange also sets mechanical strength and high extensibility in one body and is easy to make parts. It is satisfied with the needs of architects and structural designers. All metals react with oxygen in the atmosphere and form oxide films on the surface. Iron oxide formed on ordinary carbon steel continues to oxidize, causing corrosion to expand and eventually form holes. Paint or oxidizing metals can be used for plating to ensure the surface of carbon steel. As is known to all, this protection is only a thin film. Stainless steel flanges are widely used in oil, chemical, nuclear power plants, food manufacturing, building, shipbuilding, paper, medicine and other industries. It has different use in different industries and shows the value of use in various industries.

Precautions for Flange Purchase

fittingflange | 19 July, 2018 11:28

Flange is the benchmark for determining the nominal pressure level of pipelines. According to the previous introduction, there are many kinds of carbon steel flanges . Different types of stainless steel flange have different sealing performance and are suitable for different occasions. Here we discuss only how to choose different types of flanges for reference only. A. Flange type The structure type pipe flange is divided into six basic types according to the connection with the pipe: flat welding, butt welding, socket welding, loosening sleeve, threaded flange and whole flange. The sealing face type flange sealing surface has five kinds: full plane, convex surface, concave convex surface, tenon groove surface, circular groove surface and so on. Flanges code Different standards of flange sealing surface and type of name, code name slightly different. See table 6-1 and table 6-2. Table 6-1 seal face name and code comparison table Serial number SH 3406-96 HG20592 to 20635-97 JB/T74 to 90-94 1 Full plane (FF) full plane (FF) plane (FF) 2 Convex surface (RF) raised surface (RF) convex surface (RF) 3 Concave convex surface (MF) concave convex surface (MFM) concave convex surface concave convex surface (MF) 4 Tenon groove face (TG) tenon groove surface (TG) tenon groove face groove (TG) 5 Tenon groove face (TG) ring connection surface (RJ) ring connection face ring connection surface (RJ)

Strength of Large Stainless Steel Flanges

fittingflange | 16 July, 2018 11:13

First of all, large stainless steel flanges should have enough strength, and they must not be deformed when fastened. Flange sealing surface should be neat and clean. When installing, the oil stain and rust stains should be carefully cleaned. Large stainless steel flange connection is easy to operate and can withstand great pressure. Flange connections are widely used in industrial pipelines. In the family, the diameter of the pipe is small, and it is low pressure, so the flange connection is not visible. If in a boiler house or production site, there are flanged pipes and equipment everywhere. Second, the large stainless steel flange gasket should have good oil resistance and anti-aging performance, as well as better elasticity and mechanical strength. The installation should be based on the shape of the joint, with different sections and dimensions of the gasket, and placed correctly. Third, the tightening force of large stainless steel flanges should be uniform and the compression of pads should be controlled at 1/3 left.
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