Search Results

Pipe cap have other names, such as sealing head, plug, LIDS, pipe cap, bulkhead. Pipe cap’s application is to cover pipe in the form of weld or installation with thread. USES: 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. Closure phase in the form of close, only the blind flange can be sealed, sealing, and welded tube cap is not detachable. Pipe cap, including convex cap, conical shell, variable diameter section, the design of the flat cover and tighten. Dis cap , avoid joining together, will be thinned and high stress. Splice weld direction when asked to only allow is radial and ring. After large 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. Source: China Pipe Fitting Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

A pipe tee is a kind of industrial pipe fittings. It is mainly used to either combine or split a fluid flow. Most common tees have the same inlet and outlet sizes, but reducing tees are also available. Pipe tee is forming will be bigger than the three links of the diameter of the tube billet, flattening diameter size, about to tee at the site of the tensile branch open a hole; Tube billet heating, in the forming die, and within the tube billet load stretching pipe punching die; Under the action of pressure pipe by radial compression, the radial compression in the process of metal flow in the direction of branch pipe and branch pipe formed under tensile of progressive die. The whole process of the pipe is made by the radial compression and branch pipe drawing process and forming parts. Unlike hydraulic bulge forming tee, branch pipe pipe tee metal is of the pipe by the radial motion compensation, so also known as the radial compensation technology. Due to adopt heating after pressing pipe tee, material forming required equipment tonnage is reduced. Hot pressing tee with wider adaptability of material, is suitable for low carbon steel, alloy steel, stainless steel materials; Especially large diameter and wall thickness of tee, usually use this forming process. Source: China Pipe Tee Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

4-way pipe fitting is also called pipe cross. If a branch line passes completely through a pipe tee, the fitting becomes a cross. A cross has one inlet and three outlets, or vice versa. They often have solvent welded socket ends or female threaded ends. 4-way pipe fitting can generate a huge amount of stress on pipe as temperature changes, because they are at the center of four connection points. A tee is more steady than a cross, as a tee behaves like a three-legged stool, while a cross behaves like a four-legged stool. (Geometrically, “any 3 non-colinear points define a plane” thus 3 legs are inherently stable.) Crosses are common in fire sprinkler systems, but not in plumbing, due to their extra cost as compared to using two tees. Source: China Pipe Fitting Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Blind flange is a kind of a solid round plate with no center holes but with uniformly distributed bolt holes along the periphery of the plate. It is used for covering or closing the end of a pipe or conveniently cleaning sundries in pipelines for pipeline maintenance. Blind flanges have the same function as shell covers and pipe caps except minor differences—shell covers cannot be disassembled if installed while blind flanges are fastened by bolts and easily dismantled. Sealing faces of blind flanges can be categorized into several kinds: flat face (FF), raised face (RF), male and female face (MFF), ring joint face (RTJ), tongue and groove face (TG), etc. Materials of blind flanges include carbon steel, alloy steel, stainless steel, plastic, copper, aluminum, etc. A blind flange is a solid disk used to block off a pipeline or to create a stop. It is machined in the same manner as a regular flange with the mounting holes around the perimeter and the gasket sealing rings machined into the mating surface. The difference is that a blind flange has no opening to allow fluid to pass through. The blind flange can be inserted between two open flanges and used to block off the flow of liquid through a pipeline. Categories of blind flanges From the perspective of appearance, blind flanges can be pided into blind plate flanges, figure 8 blind flanges (also called spectacle blind flanges) as well as paddle blanks and paddle spacers, among which paddle blanks are generally used in conjunction with paddle spacers. Production processes of blind flanges There are four production processes of blind flanges: striking & forged, cast-forged, medium plate cutting and casting. Function of blind flanges Blind flanges have the same block-off function as shell covers, pipe caps and welding pipe plugs. Due to good sealing performance, they provide an ideal and reliable solution for the systems requiring complete sealing. Among various kinds of blind flanges, figure 8 blind flanges are shaped like Arabic number 8, with blind plate at one end and restrictor ring at the other end. Restrictor rings have the same diameter as pipelines but has no throttling function. Figure 8 blind flanges are easy to use: when sealing is required, blind plate can be used, while when normal operation is needed, restrictor ring can be used. In addition, restrictor rings can be also used to fill the clearances after mounting blind plates. Blind flanges should not be galvanized when used in systems with oil as medium but should be hot-dip galvanized in systems with other media. The minimum hot dip galvanized coating weight is 610g/m2, based on CB*/Z343 standard. The blind flange does not have a bore. It is used to blind off a flange or even a valve. When used at the end of a pipe or fitting, it provides an easy to open access for further extension of the pipe. The blind flange and its bolts are stressed more than any other flange. This flange has a raised face. Often a blind flange is inserted into a pipeline when a repair is required further up the line. This allows the flanges down stream to be disconnected without fear of losing liquid. Many times this type of blockade is used when adding another line onto an existing pipeline or when a new valve is being added. This blockade is also used to shut down a line when it is no longer needed. Without the blind flange it would be difficult to perform maintenance or repairs on a pipeline. The flow would need to be shut off at the nearest valve, which could be miles away from the repair area. Valves are also very expensive and are prone to sticking. The blind flange is a much more cost efficient way of sealing a pipe. When a pipeline is being constructed, a blind flange is often incorporated into the final length of pipe. This design allows for expansion or continuation of the pipeline by simply adding onto the final flange. This holds true for the addition of tees in the pipeline as well. A tee can be installed and then blocked in order to leave the option of running a pipe at a later date. The use of flanged pipe has allowed pipelines to be built in a much faster manner than traditional welded seam pipelines. Moreover, it has made the task of repair and sectional replacement a simpler job. Sections of pipe can now be assembled anywhere in the world and shipped to the job site. Once there, they can simply be bolted into place and the pipeline can resume transportation of its liquid cargo. Source: China Flange Manufacturer: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

“Pression Nominal” is the rating designator followed by a designation number indicating the approximate pressure rating in bars. Piping Class Ratings based on the ASME B16.5 – Pipe Flanges and Flanged Fittings: NPS 1/2 through NPS 24 Metric/Inch Standard – class and the corresponding ISO 7005 PN (Pression Nominal*) ratings: Flange Class                          150 300 400 600 900 1500 2500 Flange Pressure Nominal (PN)    20   50   68 110 150  260   420 1 bar = 1×105 Pa (N/m2) = 0.1 N/mm2 = 10,197 kp/m2 = 10.20 m H2O = 0.98692 atm = 14.5038 psi (lbf/in2) PN ratings do not provide a proportional relationship between different PN numbers, whereas class numbers do. Class numbers are therefore recommended before PN ratings. Note! The piping rating must follow the pressure-temperature rating of the weakest pressure containing item in the system. These pressure classes also have differing pressure and temperature ratings for different materials. Unique pressure classes for piping can also be developed for a process plant or power generating station; these may be specific to the corporation, engineering procurement and construction (EPC) contractor, or the process plant owner. The ANSI/ASME pressure classes for Flat-Face flanges are 125# and 250#. The classes for Ring-Joint, Tongue & Groove, and Raised-Face flanges are 150#, 300#, (400# – unusual), 600#, 900#, 1500#, and 2500#. The flange faces are also made to standardized dimensions and are typically “flat face”, “raised face”, “tongue and groove”, or “ring joint” styles, although other obscure styles are possible. Source: China Flange Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

The continuation of rolling process for steel pipe rolling and reducing process. steel pipes rolling is a steel pipes with mandrel movement process in the multiple frame, and steel pipe deformation and movement of the rollers and mandrel work together. Can is a free floating mandrel, also is all by metal drive forward movement; Can also be a limit of lift, that is, to a speed of rods, limit the freedom of movement. In the process of movement, the mandrel, roll and steel pipe connection into a whole, the change of any one of these links will cause the change of the state of the system as a whole, and rolling theory is the theory of study of the relationship between them. The kinematics of steel pipes rolling phenomenon 1, kinematics phenomenon 2, sliding phenomenon 3, tension coefficient MPM motion analysis 1, the displacement of the rolled piece and the mandrel 2, frame and its determination 3, intermittent rolling analysis 4, single rolling mandrel movement characteristics The deformation and stress in steel pipes rolling 1, internal stress analysis of tandem rolling 2, wall deformation and stress analysis Source: China Steel Pipe Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Stainless steel blind flange with the rapid development of domestic foreign minister pipeline construction, pipeline pressure test become an indispensable important link, in before, during and after the test must be conducted for each section of the pipeline ball-passing sweep line, generally for 4 ~ 5 times. Especially after the pressure test, pipeline inside water is very difficult to clean, cleaning the number will be more. In the closed ball using repeated construction method of welding head, its existing problems: one is to increase the Labour strength of workers; 2 it is repeated welding consumables high head method, need more large equipment, the cost is high. For long distance pipeline pressure test to pass the ball after the scanning line, at the serve by repeated welding head method of high labor intensity big, consumables, need more large equipment, the problem of high cost, this paper proposes a new simple quick opening large blind flange construction method. The construction method of this article introduces the structure of the fast-opening blind, work steps and intensity. Through application on acerbity NingLan gas transmission pipeline engineering, prove fast-opening blind construction method than repeated three times welding head construction methods to improve work efficiency, not only reduce the labor intensity of workers, and reduce the cost. Stainless steel flanges need to do some preparation work before measurement, measurement, according to certain way and method to determine the different measurement methods, according to the specific situation to ensure the accuracy of the measurement. To introduce the following Stainless steel blind flange measurement: measure the preparation work before the: 1. According to the large flange position before measurement, should first sketches, equipment each connecting large flange and numbered consecutively, so that the fixture installation to the number, according to certain way and the principle for installation, ensure the normal use. 2. Because when installation of Stainless steel flange diameter is different, possible hi-lo (different), the thickness of the gasket is not equal, so the processing of fixture should correspond to the side of the Stainless steel flanges are not interchangeable, thus measurement by size and number is the key to the fixture processing and installation 3. Measurement, it is best to arrange three people, two of them were measured, and one to proofread and fill out a form, measuring tool use vernier caliper, if there were no conditions available outside calipers and steel ruler. Measurement is a careful work, is the precondition of fixture installation, measure and record must be prepared to correct, when completing this form must be clear. Seriously to each other in the actual measurement to cooperate, can according to the principle of the right to cooperate and use. Source: China Blind Flange Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

There can be many variations on the shell and tube heat exchanger design. Typically, the ends of each tube are connected to plenums (sometimes called water boxes) through holes in tubesheets. The tubes may be straight or bent in the shape of a U, called U-tubes. 1, the fixed tube plate When the temperature difference between the two fluids is large, a compensating ring (or expansion joint) is welded in the proper position of the outer shell of the fixed tube plate heat exchanger with both ends of the tube sheet and the shell being integrated. When the shell and tube bundle thermal expansion is not the same time, the compensation ring slow elastic deformation to compensate for thermal stress caused by thermal expansion. Features: simple structure, low cost, shell-side cleaning and maintenance difficulties, the shell process must be clean and not easy to scale the material. 2, U-tube U-tube heat exchanger tubes are bent into a U-shaped tube, fluid inlet and outlet were installed in the same side on both sides of the head with a partition into two rooms, each tube is free to expand and retract, to solve the heat Compensation problem. Features: simple structure, light weight, suitable for high temperature and high pressure applications. Pipe cleaning difficult, tube fluid must be clean and not easy to scale material. 3, floating head type Shell and tube heat exchanger at both ends of the tube plate, one end is not connected with the shell, the end of said floating head. Tube heating, the tube with the floating head can be free along the axial stretching, completely eliminating the temperature stress. Features: complex structure, high cost, easy cleaning and maintenance, complete elimination of temperature stress, the application of universal. The simple design of a shell and tube heat exchanger makes it an ideal cooling solution for a wide variety of applications. One of the most common applications is the cooling of hydraulic fluid and oil in engines, transmissions and hydraulic power packs. With the right choice of materials they can also be used to cool or heat other mediums, such as swimming pool water or charge air. One of the big advantages of using a shell and tube heat exchanger is that they are often easy to service, particularly with models where a floating tube bundle (where the tube plates are not welded to the outer shell) is available. Source: China shell and tube heat exchanger Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

As the match of the two carbon steel flanges can not be absolutely concentric, leading to carbon steel flange sealing surface is not parallel. So tighten the bolt when the carbon steel flange bending moment, so that the force carbon steel flange is not uniform. As a result, on the sealing surface, while reducing the sealing pressure, on the other side to strengthen the sealing pressure, in order to achieve the purpose of sealing, had to tighten the bolts tighten, this will lead to carbon steel flange deformation under the action of the load , It is prone to leakage. Another is the rigidity of the carbon steel flange requirements, the original design of the carbon steel flange, the only strength calculation, but little rigidity calculation, but more and more production practice has proved that carbon steel flange stiffness will also affect the carbon steel flange seal , Rigidity of the carbon steel flange will produce insufficient warping deformation, the gasket force is not uniform, and lead to leakage. Source: China Flange Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

The technical requirements of stainless steel pipe fittings are clearly defined in various standards or technical agreements. The main contents include the following: (1) variety specification. Provisions of stainless steel pipe fittings should have the shape, size and its tolerance, the theory of trial, etc.. Round pipe specifications are usually expressed in DxS, such as 50mmx2mm stainless steel pipe diameter of 50mm, wall thickness of 2mm. The precision of the dimension is the thickness of the wall, the precision of the outside diameter and the ellipticity. (2) surface quality requirements. The internal and external surface condition of stainless steel pipe fittings and the degree of the existence of the allowable surface defects. (3) chemical properties. The chemical composition of steel and P, the maximum content of S and test methods. (4) the physical and mechanical properties of the steel structure: the metallurgical structure, mechanical properties and technological properties of the steel. (5) inspection standards. Requirements for inspection items, sampling locations, sample shapes and dimensions, test conditions and methods, etc.. In the production of stainless steel pipe in addition to conventional test items, and sometimes need to carry out some of the process performance test. Geometric dimensions include outer diameter, inner diameter and wall thickness. It is also required to control the radius of curvature. If the radius is 1.5d, the radius of curvature must be within the required tolerances. As most of these stainless steel pipe fittings are connected to pipes by welding, in order to improve the quality of welding, the end of the stainless steel pipe fitting should be cut into a groove, leaving a certain angle with a certain edge; this requirement is relatively stringent and there are regulations for edge thickness, angle and range of variation. The surface quality and mechanical properties of pipe fittings are basically the same as those of the tubes. The stainless steel grade of stainless steel pipe fitting is the same as the connected pipe in order to facilitate welding. There should be surface treatment for all stainless steel pipe fittings, removing the inner and outer scales by shot blast and then coating with anti-corrosion paint. This process is not only for exporting to other countries, but also for preventing oxidation rust during domestic transportation. There are also some requirements for packing. For small size stainless steel pipe fittings, we need to make a wooden box which is about 1 cubic meter and the total weight of pipe fittings inside should not exceed one ton; this standard allows a mixed package, that is, putting the small size stainless steel pipe fittings into the big ones, but the total weight can not be over 1 ton. For big size stainless steel pipe fittings, we need to have a single package, for example, stainless steel pipe fittings with size of 24 inch should be packed alone.  In addition, the marks on packages, is to indicate the size, steel number, batch number and manufacturer trademark. Stamp the stainless steel pipe fitting with steel seal along with documents of packing list and written warranty. Source: China Pipe Fitting Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

According to the research institutions to verify that the life of the coating depends on the type of coating, coating quality and construction environment and other factors, the surface treatment of alloy pipe on the life of the coating about 50%, therefore, should be strictly in accordance with the Code On the surface of the alloy elbows requirements, continue to explore and summarize, and constantly improve the surface treatment methods of alloy elbows. 1, cleaning of alloy elbows The use of solvents, emulsions to clean the surface of steel to achieve the removal of oil, grease, dust, lubricants and similar organic matter, but it can not remove the steel surface rust, oxide, welding, etc., so in the anti-corrosion production only as an auxiliary means. 2, The surface of the alloy elbows derusting Mainly the use of steel wire brush and other tools to polish the steel surface, you can remove loose or tilt of the oxide, rust, welding slag and so on. Manual tool derusting can reach Sa2 level, power tools rust can reach Sa3 level, if the steel surface attached to a solid iron oxide skin, tool rust effect is not ideal, not up to the requirements of anti-corrosion construction of the anchor depth 3, The pickling of the alloy elbows General use of chemical and electrolytic two methods for pickling treatment, pipeline corrosion only chemical pickling, you can remove the oxide, rust, the old coating, and sometimes can be used as a blasting and then re-treatment. Chemical cleaning, although the surface can achieve a certain degree of cleanliness and roughness, but the anchor is shallow, and easy to cause pollution to the environment. 4, The spray (throw) shot rust of alloy elbows Spray (throw) shot rust is driven by high-power motor spray (throw) shot high-speed rotation of the blade, steel sand, steel balls, wire segments, minerals and other abrasives in the centrifugal force on the surface of the alloy fittings spray (throw) , Not only can completely remove the rust, oxides and dirt, and the steel pipe in the abrasive impact and friction under the action, but also to achieve the required uniform roughness. Source: China Elbow Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

1, Please measure the outer circumference of the stainless steel head. If the cylinder is processed in advance, please inquire with the company about the size of the predetermined outer circumference. 2, the stainless steel head circumference of 4 equal parts, and in the cylinder and stainless steel head on the mark. 3, according to the sequence of positioning welding, positioning of the welding location, please customers according to the diameter and thickness of self-selected sites. 4, positioning welding is completed, the welding. Attention to the protection of the surface of stainless steel head 1. Stainless steel head and cylinder group after welding, it is necessary to promptly clean up the weld, heat affected zone and the surrounding welding slag, spatter, contaminants, and PT inspection and surface pickling. 2. To prevent the surface of the stainless steel head bump scratches. 3. To prevent direct contact with carbon steel to avoid iron contamination. 4. not in the open air storage, rain. 5. Avoid forced welding. Structural design to prevent restraint stress is too large. 6. Hydrostatic test water chloride content of not more than 25mg / L, after the test to dry in time. 7. Stainless steel pickling can not use hydrochloric acid to reduce acid. 8. Strictly observe the “compatibility rules” of the media compatibility. Note: for 0Cr18Ni9 and 304 metastable austenitic stainless steel head is easy due to improper surface protection, and cause surface pitting. When coupled with the processing stress, welding stress, eventually leading to stress corrosion and intergranular corrosion. To this end, customers pay special attention to the surface of such stainless steel protection. Head Caution 1. Carbon steel head cracks in the nitrate, ammonia, alkaline sodium and other environments, please explain the elimination of residual stress when ordering stainless steel head. 2. Austenitic stainless steel in a chloride ion of specific circumstances will occur stress corrosion cracking, please select the appropriate material in the design. 3. To be hot-dip galvanized or aluminized carbon steel containers, please do first heat treatment to remove residual stress. Source: China Pipe Fitting Manufacturer – wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)