The tefbellows is an expansion joint that combines the properties of metal and ptfe into the most advanced expansion joint available for highly corrosive piping systems. Expansion bellows and construction expansion joints. We offer top quality manufacturing and sell coast guard approved rubber expansion joints with the most competitive pricing. It is essential that the weld in the bellows be as strong as the surrounding material. An expansion joint bellow element employed in a piping system is an assembly of generally more than one convolute in series. Other terms used compensator, flexible connector rubber bellows the flexible element within a rubber expansion joint. Regardless of accessories, such as liners and covers, it will deflect in any direction or plane that the bellows will. Expansion joints september 2008 195 where practical and where additional protection for bearing assemblies and hinges is warranted, a secondary sealing system may be provided below the expansion joint assembly. Expansion joints technical calculation selection of the expansion joint the main function of expansion joints is to compensate the movements and vibrations in piping systems, machinery and equipment.
Calculation of bellow parallel offset sanyi zheng sscl april 14, 1993. B6 guardian 306 ezflo garlock guardian 306 ezflo spooltype expansion joints feature an fep lining that is fused to the body of the expansion joint. Pressure balanced expansion joints pressure bellows. Ejma was founded in 1955 to establish and maintain quality design and manufacturing standards. Kaishu guan et al stated the failure of a bellow expansion joint of 304 stainless steel has been analysed. Thermal expansion of the carrier pipe during operation is therefore. In simple words, they are junction points which carry the emerging loads on the pipe section. Ejma bellows calculator pounds per square inch mechanical. The convolutes are designed strong enough to withstand the internal pressure of the system, at the same time the typical contour of the convolute assembly allow sit to flex under thermal movement of the connected piping. Bellows design calculation metal expansion joints, metal. Hence, type of raw material and its properties, its geometric features, other influencing design factors, construction or.
Designing with metal bellows metal bellows have long been a key component in demanding sensing and sealing applications. Download as xls, pdf, txt or read online from scribd. In addition to metal products we manufacture nonmetallic, duct type, fabric and composite expansion joints for the power generation, pulp and paper, cogeneration, and ship building industries, as well as many other types of industry. Expansion joint bellows are capable of movement in an axial, angular or lateral direction. What is the difference between a bellows and an expansion. Expansion joints installation and maintenance guide november 15, 20 october 31, 20 marissa leave a comment preparation, proper instruction and the right tools will lead to the successful installation or repair of any component aboard your vessels. The three parts are connected at the ends with end caps.
But it does have the same disadvantages as the sliding joint in that pressure inside tends to extend the fitting, consequently, anchors and guides must be. This program will also give you the steps and programing dimensions for the programable back gauge starting from the center out in both directions, flanges last. When using flexicraft metal bellows expansion joints, you can be assured they were designed and built to last. This pipe expansion joint is simply a bellows element with end connections. Ejma carries out extensive technical research and testing on many important aspects of expansion joint design and manufacturing.
The bellow that will be studied is of utype, which has a flank, f, that braid gas tight bellow innerline end cap l r z one. Optimization of fccu expansion joint application, system. One approach is to calculate the allowable parallel off set of bellows based on their parameters. No one can offer greater security or variety in meeting your needs for steam or any other applications. Are points which seperateand isolate expansion sections constituted on the pipe system. Expansion joints installation and maintenance guide. Flexicraft industries expansion joints and all flexible. Senior flexonics catalogs provide detailed specifications about our products and are a great reference for your specific application.
Single metallic expansion joint, 8 inch expansion joint. The flexible bellow consists of a number of convolutions, n, see figure 3. The movements that the expansion joint has to compensate are always movements from one part of the piping system relative to another. Use our different data sheets as references to see which bellows will meet your needs. Triad bellows design and manufacturing uses bellows design software based on ejma 10th edition guidelines. Metal bellows expansion joints for expansion and contraction. The performance of expansion joint is mainly depends on the geometric features of bellow. Metal expansion joints and metal bellows hose master.
Expansion joints installation and maintenance guide world. Calculation of bellow parallel offset sanyi zheng sscl april 14, 1993 abstract. Standards of the expansion joint manufactures association, inc. Rubber expansion joints, pipe joints, rubber piping and. Metallic bellows the main element of an expansion joint, which consists of one or more convolution, is called bellow. Ejma 10th edition is the most current edition and supersedes all previous publications.
A complete line of products, combined with our extensive experience, means. Find minimum feet required for this amount of expansion from chart. Rubber expansion joints are a flexible connector fabricated from natural or synthetic elastomers and fabrics with metallic reinforcements designed to provide stress relief in piping systems due to thermal changes. Just specify a few key dimensions, pick a metal alloy and youre good to go. Our experience and broad product range enable us to provide high quality solutions and services for the benefit of our customers. Common failure areas of expansion joint to inspect the common failure areas are the bellows inner ply leaking. Using customerprovided components from an expansion joint removed from service, hose master can replace bellows and often reuse preexisting pipe and fittings. Single tied metallic expansion joints with twoply alloy bellows. Designed specifically to suit the customer project. The pressure thrust forces cancel acting across the tie rods attached to the tie flanges.
Witzenmann, the inventor of the metal hose and founder of the metal hose and expansion joint industry is the top name in this area. Definition of the use of expansion joints bellows in piping. Routinely monitor testable 2ply bellows using the test port. Caculation of bellow parallel offset sanyizheng physics research division efd vacuum group dec. Please look at the id chart to choose the right products depending on the intended. Rubber expansion joints carries the largest online inventory of single arch rubber expansion joints, dual arch rubber expansion joints and more.
The expansion joint manufacturers association standard, 7th edition, 2000 addenda. They are designed with several bellows where the effective area of the balancing bellows is twice that of the line bellows. Place the bellow element in the suitable fixture as shown in the figure 6. Expansion joint engineering according to design codes such as ejma, asme, ped, en 445, en 149147 etc. Forces and moments acting on anchors can be calculated based on model selected. The expansion tallies with that of the chosen compensator. Torsion destabilizes an expansion joint reducing its ability to. The expansion tallies with that of the chosen compensator the fixes points are dimensionned so that they can absorb the reaction forces and stiffness rate that arise during use.
When flexibility for this movement cannot be designed into the piping system itself, an expansion joint is the ideal solution. Ejma bellows calculator free download as excel spreadsheet. Review the metal expansion joint flexible coupling models below to choose the optimal design for your application, or contact our highly trained staff for assistance. A complete line of products, combined with our extensive experience, means our industrial customers find exactly what they need. In fact, theyve become so familiar that many engineers now think of bellows as generic items.
This offers a costeffective option when dealing with very large diameter expansion joints and special designs. Viii, division 1, 2001 edition bellows element geometry bellows material. Universal pressure balanced expansion joint with elbow at turbine pipeline. To combine axial, lateral and angular movements, please refer to the how to order section to increase cycle life or movements, please refer to graph on cycle life rated bellows extension is equal to rated axial movement. The basic flexible element of an expansion joint is the metal bellows, which is. Download metallic pipe exapnsion joint catalog pdf download fabric expansion joint catalog pdf expansion joint data tables. Expansion joint an expansion joint is a complete unit with metal bellows or rubber bellows and end fittings, plus, optionally, liner, cover and external hardware. The expansion joint manufacturers association standard, 7th edition, 2000 addenda allowable stress basis. Lateral expansion joint applications lateral expansion joint installation angular expansion joint applications angular expansion joint installation what is expansion joint description of compensators. Metal bellows expansion joint offers greater compression than the standard mc ultimate in control and safety. But it does have the same disadvantages as the sliding joint in that pressure inside tends to extend the fitting, consequently, anchors and guides must be able to withstand this force. The first invention, a metal hose which was developed and patented in 1885, was followed by a patent for the metal expansion joint in 1920. Flexpert bellows stainless steel expansion bellows metal. Expansion calculation leaders in pipe joint restraint and.
The expansion joint manufacturers association, inc. Just enter the step number and dimensions from the calculator directly into your back gauges computer, very easy. Welcome to triad bellows stainless steel exhaust bellows data sheets page. Sac can form expansion jointsbellows compensators of thickness from as low as 0. This product is designed for the chemical processing and. Specification for metallic expansion joint project standards and specifications table of content scope 2 references 2 units 2 design requirements 3 general 3 material 3 bellow design 3 bellows design criteria 4 mechanical design 4 external cover 5 internal sleeves 5 element identification and dimensions 5 welding and nondestructive. Expansion calculation leaders in pipe joint restraint. If you are too aggressive disassembling an old expansion joint, you could bend, dent or damage the pipe or vent. Single metallic expansion joint, 8 inch expansion joint u. Furthermore, an important suggestion should be made that the effect of environmental medium on fatigue life must be paid more attention to when dealing with fatigue analysis for bellows expansion joints. An expansion jointbellow element employed in a piping system is an assembly of generally more than one convolute in series. Welding is done by qualified welders using machines specially built for the purpose.
583 533 797 710 39 54 1078 1073 1548 1257 933 1426 495 986 915 387 298 790 747 581 1353 1340 179 561 638 729 858 1313 1207 245