This expansion joint design will accept large amounts of lateral offset in multiple planes. Each expandoflash cover is a combination of a flexible rubber membrane, supported by a closed cell foam to form flexible bellows, with two metal. Extreme care must be exercised while inspecting any pressurized system or component. Expansion joints absorb variations of ducts caused by thermal expansion and contraction. If an expansion joint is to be installed underground, or will be submerged in water, contact the manufacturer for speci. Anchor base expansion joint can be installed which incorporates two joints and an intermediate anchor. Macoga expansion joints for 2 biomass power plants in the british columbia, canada 09.
High expansion compensation, low adjusting forces, soft corner. What are expansion joints an expansion joint or movement joint is an assembly designed to safely absorb the heat induced expansion and contraction of construction materials, to absorb vibration, to hold parts together, or to allow movement due to ground settlement or earthquakes. Rubber expansion joints hks hks rubber expansion joints are available in different models universal, lateral and angular expansion joints, rubber bellows qualities depending on medium and the bellows design depending on pressure and temperature. This expansion joint as with the single metal bellows expansion joints. Metal bellows expansion joints for expansion and contraction. For this reason axial expansion joints should be installed coaxially with the piping.
However, stresses are induced in the expansion joint. Universal expansion joint this expansion joint has two bellows sections connected by a center pipe section. A single joint can also be used to absorb angular and lateral movements, as well as a combination of these 3 basic movements. The basic flexible element of an expansion joint is the metal bellows, which is flexible on all planes. Flange connection general stainless steel metal bellow expansion joint is the most common and popular, it is mainly used in pipe. These joints also absorb vibrations due to flow of gases. Two hinges angular expansion joints or alternatively one lateral expansion. Expansion joint products 5 dual expansion joints a dual expansion joint can be used to gain larger axial movement than that of a single piping expansion joint can handle. Macoga expansion joints for crude storage tanks in the north of england 07. Stainless steel expansion joint, type rfas applications a stainless steel expansion joint with carbon steel flanges for the use in thermal oil pipe systems. Immediately after placing the system in operation, a visual inspection shall be conducted to insure that the thermal expansion is being absorbed by the pipe expansion joints.
With the addition of tie rods this metal bellows expansion joint. Sealing problems and large space requirements of other expansion devices are eliminated with bellows expansion joints. This product is designed for the chemical processing and. We are recognized as the lead innovator for high temperature industrial expansion joint. The hinged expansion joint consists of bellows that are allowed to move at an angle by two. Using customerprovided components from an expansion joint removed from service, hose master can replace bellows and often reuse preexisting pipe and fittings. This type of expansion joint is basically meant for axial movements only. The cost of downtime of a critical expansion joint far exceeds the cost of a spare unit placed and protected in reserve onsite. Bellows of special expansion joints are designed according to ejma code. Newland corrugated bellows expansion joints may buckle under internal pressure in the same way as an elastic strut may buckle under an axial load. Metal expansion joints installation instructions keflex 1425 lake avenue woodstock, il 60098. Hvac expansion joints compensators and flexible connectors normal corr. Universal expansion joint assemblies consist of two bellows connected by a center spool piece wth. Expansion joint type 39 type 39 type 39 is a handbuilt low corrugated rubber comflex expansion joint and can therefore be customised to fit in any existing gap by virtue of its variable overall length.
The failure of bel lows expansion joint of 304 stainless steel was analyzed by guan. It is always important to have one axial expansion joint between two. Performance testing of bellows bellows are correlated with actual. This offers a costeffective option when dealing with very large diameter expansion joints. This offers a costeffective option when dealing with very large diameter expansion joints and special designs.
For an expansion joint to absorb the axial or lateral movements expansion or compression of a pipe, it must be arranged between two. Bellow expansion joints is one of the best expansion joints manufacturer offers metal bellows, metallic expansion joints, bellow couplings, valve bellows. The stainless steel bellows should be made to avoid lateral movements by providing directional main anchors at ends two direction supports acting at right angles to the axis of the pipe to direct the piping growth in to this joint. A universal expansion joint is an assembly containing two bellows connected by a centre pipe and equipped with tie rods. Metal expansion joints installation instructions pdf. Flexicraft provides a full range of metal bellows expansion joints designed for engine exhaust, including blowers, fans, diesel engine generators, marine exhaust. Dual center anchor base configurations series 1500 laminated bellows expansion joints are. Addition for friction force from guides between two. Bellows expansion joints because the bellows expansion joint is required to absorb thermal andor mechanical movements, the bellows element must be constructed of a relatively.
Joint opening plus curb widths must be considered for bellow. Bellows company team outside the houston, tx facility. Expansion joints with 2 ply testable and monitored bellows for north european refinery 08. These expansion joints are generally designed to accommodate lateral movement only. Bolts should be installed from the bellows side so that the bolt heads are adjacent to the bellows to insure that the bolts do not. Lateral expansion joints designed to absorb lateral deflection. Transportation of foodstuffs, potable water distribution. Metal bellows expansion joints offer a cost effective alternative to other expansion. Once you have determined the part that best matches your requirements, we will be able to see if a standard or custom design would be the most beneficial for your situation. Bellows expansion joints comprise of a bellow, end fittings, control rods, liners, and. All the two ply metal bellows manufactured in bsi are in accordance with the expansion joint manufacturers association ejma guidelines latest edition. Buckling of double bellows expansion joints under internal pressure by d. Universal expansion joints are mainly used to absorb any combination of the.
In order to locate ourselves close to the customers, ayvaz. Metal expansion joints engineering, manufacturing and sales. Definition of the use of expansion joints bellows in piping. Universal rubber expansion joints lateral rubber expansion joint design. Metal bellows expansion joints offer a cost effective alternative to other expansion devices while optimizing the productive life of a piping system.
Bellows are widely used in industrial and mechanical applications such as rod. The failure of a bellow expansion joint of 304 stainless steel has been analysed. It consists of two metal bellows with an intermediate pipe and connectors on both sides. The expansion joint manufacturers association, inc. Tied universal expansion joints are constructed with two stainless steel bellows of an equal length separated by a center pipe just like a standard universal joint. Universal expansion joints are mainly used to absorb any combination of the three basic movements in the piping system.
Tied metal expansion joints retain pressure thrust developed by internal pressure, through the use of hardware. Normal corr expansion joints employ a standardized bellows design ideally suited for general industrial applications. Tied custom metal expansion joints for general pressure applications. The axial expansion joint consists of bellows with flanged or welded terminals. 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. Low corrugated rubber bellows with reinforcing inserts and builtin packing profile for absorption of the swivel flanges. Our expansion joints are designed to last as long as the system. If a bellows expansion joint is located in a space with no access, then the shell wall must be cut open, which results in laborintensive and. Sleeve of the expansion joint is failing and because of these failures, bellows. The gimbal expansion joint is usually used in pairs of two or in combination with the hinged expansion joint. Sleeve of the expansion joint is failing and because of these failures, bellows directly exposed to hot gases also. Apr, 2016 there are two sets of hinges linked with a floating ring that is responsible for absorbing the pressure of the expansion joint assembly.
Bellow expansion joints manufacturer metal bellows kp. This expansion joint consists of two bellows connected by a center spool piece with flange or pipe ends. Offered with flanges or butt weld ends from 3 to 48 nominal diameter for design pressures to 300 psig at 650f. Expansion joint specifically designed for highway use within structures creating longitudinal movements of 15 mm, vertical movements up to 10mm. Failure of the duct is been observed in expansion joints. The basic constituent element of expansion joint, bellows, can be specified, considering on movement, pressure, temperature, service life and corrosion rate required. An expansion joint is a specially engineered product inserted in a rigid. In line pressure balanced expansion joint two ply monitored bellows design temperature. Hvac expansion joints compensators and flexible connectors.
The technical calculations of flexocon engineers designs are. Other terms used compensator, flexible connector rubber bellows the flexible element within a rubber expansion joint. All units meet the standards of the expansion joint manufacturers association ejma and military specification mile178. Two 24 diameter fabric expansion joints for an oil refinery. The first invention, a metal hose which was developed and patented in 1885, was followed by a patent for the metal expansion joint. For application to curbs style ej important sizing note.
The expansion joints must also not be exposed to high externally radiated or accumulated heat. If you are unsure of what kind of bellows design is right for you contact our engineers today and we will provide you with the right bellows for your application. An expansion joint or movement joint is an assembly designed to hold parts together while safely absorbing temperatureinduced expansion and contraction of building materials, and vibration, or to allow movement due to ground settlement or seismic activity. 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.
Pipe supports for pipe loop expansion joint stronger fix points. The lowcycle fatigue life of bellows using elasticplastic anal ysis was predicted by hamada and tanka 11. Designer and manufacturer of expansion joints belman as. The universal arrangement allows greater axial, lateral.
The amount of deflection is based on the amount of angulation each bellows can take and the length of the center spool. For an expansion joint to absorb the axial or lateral movements expansion or compression of a pipe, it must be arranged between two fixed points. Stress corrosion cracking scc caused by wet hydrogen sulfide was responsible for the failure. As a special form of the axial expansion joint, the universal expansion joint has only a limited pressure resistance for stability reasons and, moreover, loads the adjacent pipe supports with the axial compressive force resulting from the internal pressure. For applications where a thermal expansion of the piping has to be absorbed. This type of expansion joint requires the most control of the adjacent piping in regards to anchors and guiding.
Normal metallic expansion joint, when used for a long period of time in an environment transporting gases and liquids of high pressure and temperature can cause cracks, leakages, deformations, and eventual failure of the pipelines. Metal expansion joints and metal bellows hose master. Welcome to triad bellows stainless steel exhaust bellows data sheets page. The eej cover is 60mil thick, reinforced epdm bellows widely used in roof to roof and roof to wall cant applications. Most bellows expansion joints have a life span of 1011 years. The figure below typifies good practice in the use of a single expansion joint to absorb axial movement. This is what happens, shell moves independently of the tubes. Tie rods or limit rods stabilize the center pipe connection and distribute movement evenly between bellows. Universal tied, aut metal expansion joints contain two bellows separated by a pipe spool and tie rods designed to contain the pressure thrust force. All the two ply metal bellows manufactured in bsi are in accordance with the expansion joint. Designed to cover the mid temperature and pressure range for general process equipment. Universal metal bellows expansion joints are constructed with two metal bellows of an equal length separated by a center pipe. They are mainly required to absorb any of the three general.
What is the difference between a bellows and an expansion. Triads dual metal expansion joints consist of two single bellows connected by center pipe. It consists of an extruded rubber bellows, vulcanized to two 80x80x9. It is usually furnished with limit rods or full thrust tie rods, depending upon the service conditions. Now we can see the benefit of the expansion joint, then the expansion joint is installed. Inspection of metal bellows expansion joint piping systems duration. Arrangement of pipe joint expansion joints in three joint systems for compenfitting example 7 eb 7 expansion joints with tie rods should expansion joints for pump connection withwithout tie rods for absorbing vibrations.
These joints generally have two bellows linked with a center pipe and fitted with the tie rods. Suited for combined and multiple types of movements. Ejma was founded in 1955 to establish and maintain quality design and manufacturing standards. Expansion joint bellows are capable of movement in an axial, angular or lateral.
Its designed that end pipe and flange are welded at the both edge of bellows. Lateral expansion joints can move in all lateral directions simultaneously for absorbing expansion from two pipe sections in different directions. Oakridge bellows metal expansion joints 9,236 views. Single tied metallic expansion joints with twoply alloy bellows. Immediately after placing the system in operation, a visual inspection shall be conducted to insure that the thermal expansion is being absorbed by the pipe expansion joints in the manner for which they were designed. 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. Flange connection general stainless steel metal bellow expansion joint is the most common and popular, it is mainly used in pipe connection, aborb the extension and compression of pipe, according to different working situation, usually we recommend different structure, but for most common, we recommend general stainless. Lateral deflection the relative displacement of the two ends of an expansion joint. To prevent this from happening, bellows are used in the system, thereby being termed as bellow expansion joints. Brba, brbc, brbg, brbs and brbwc exterior roof bellows expansion joint systems, surface mount, membrane options, closed cell support foam. Fabric expansion joint catalog inko engineering supplies pte ltd. There two types of expansion joint, first the thin joint. What is the need of expansion joints and bellows in piping.
You can also find technical information as a pdf download. The term bellows is used by extension for a number of applications that do not involve air transfer. Flange connection general stainless steel metal bellow. A bellows expansion joint is an assembly of two or more bellows which help to tackle expansion or contraction in the system. This paper is concerned with the analysis of this phenomenon for the universal expansion joint which incorporates. Witzenmann, the inventor of the metal hose and founder of the metal hose and expansion joint industry is the top name in this area. Angular expansion joints designed to allow only angular movements. A universal type expansion joint is one which contains two bellows with a connecting pipe between them. Hinged expansion joint this expansion joint has a single bellows section and is designed. Universal expansion joints without tie rods for absorbing axial, lateral and angular movements.
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. Nystroms roof bellows system is an effective, flexible joint closure for a wide variety of standard and special applications. Expansion joints technical manual draco mechanical supply. Delivery of two fccu expansion joints for a european refinery 06. Pdf failure of 304 stainless bellows expansion joint. It can only absorb axial movement and must always be installed between two fixed points. Senior flexonics pathway produces round and rectangular metal expansion joints in all types of hardware configurations from 2. With this you can effectively find technical data and select the expansion joint needed for your project. Note that the expansion joint is placed between two main anchors and that it is located near one of the anchors. An expansion joint bellow element employed in a piping system is an assembly of generally more than one convolute in series. Use our different data sheets as references to see which bellows will meet your needs.
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