Universal expansion joints without tie rods for absorbing axial, lateral and angular movements. This offers a costeffective option when dealing with very large diameter expansion joints and special designs. Should an expansion joint location have very large axial andor. These help in providing a compressive and expansive effect on the device thereby helping to withstand extreme conditions. Axial expansion joint with bellows of stainless steel 1. Expansion joints arsenflex flexible metal hoses and expansion. The production of rubber bellows for expansion joints belongs to the contitech business unit air spring systems as both are similar rubber bellow products with. When it comes to the design and manufacture of expansion joints, adsco is an industry leader recognized the world over for the quality and innovation of our products. Ayvaz is one of the biggest metal bellowed expansion joint manufacturers. The assemblies may include fabricated elbows, tees, and straight sections of duct work, in carbon steel or stainless steel, and in diameters of 42. You can also find technical information as a pdf download at. The bellows is the basic element of expansion joint, which can be made by mechanical and hydraulic forming as the requirement in megaflexon facility. The expansion joints must also not be exposed to high externally radiated or accumulated heat. We look at a problem with the design of expansion joints.
Vaidutes felikisas jakusikas, transverse vibration of bellows expansion joints journal of applied mechanics, trans of the asme. Rubber bellows for expansion joints expansion joints are parts of piping systems for fluid and gaseous media. The expansion joint manufacturers association standard, 7th edition, 2000 addenda allowable stress basis. For information on expansion joints not described, please contact the factory. The failure of bellows expansion joint of 304 stainless steel was analyzed by guan et al.
Corrugated expansion joints lens expansion joints rubber expansion. Using customerprovided components from an expansion joint removed from service, hose master can replace bellows and often reuse preexisting pipe and fittings. Bellows cycle life shall be determined per appendix x of the asme b 31. The basic flexible element of an expansion joint is the metal bellows, which is. Axial extension has been referred to as axial movement, traverse, elongation or extension. Series ffb bellows expansion joints are designed and constructed per application to meet specific design requirements regarding combinations of pressure, temperature, motions, and cycle life. To make metal expansion joint bellows, metal bellows manufacturers attach the metallic bellows with end fittings, control rods, liners, cover, and other components to.
For application to curbs style ej important sizing note. Ejma standards pdf free 102 ejma standards, ejma standards pdf, ejma standards 10th edition pdf. Universal expansion joints universal metal bellows expansion joints are constructed with two metal bellows of equal length separated by a center pipe. Metal bellows and metal bellows expansion joints have the same basic components regardless of the manufacturer and manufacturing method. Metal expansion joints from unisource manufacturing. Prior to 1988, coverage of metallic bellows expansion joints in asme b31. The amount of deflection is based on the amount of angulation each bellows can take and the length. Bellows provides custom designed expansion joints in duct work and fabricated duct work assemblies.
The metragator is an externally pressurized expansion joint that has several advantages over other bellows joints. Fabric expansion joints can handle combined axial, lateral, angular and torsional movements with just one unit, the expansion joint locations should be carefully selected to keep the number of expansion joints in the system to a minimum and still absorb all of the duct movements. A bellows expansion joint is an assembly of two or more bellows which help to tackle expansion or contraction in the system. Dual units are rated for either 8, 12, or 16 of axial travel. Temporary 20 inch bypass line with expansion joints failed due to its unsatisfactory design. Erv expansion joints from elaflex hiby are moulded single sphere type rubber bellows with swiveling metal flanges. Apr 07, 2021 the expansion joint manufacturers association, inc. Triad bellows series1 expansion joints are manufactured with multiple layers of heavier gauge t321 ss material to achieve higher pressure ratings. If this cannot be achieved or proves expensive, the pressure thrust must be restrained by suitable expansion joint hardware, i. To make metal expansion joint bellows, metal bellows manufacturers attach the metallic bellows with end fittings, control rods, liners, cover, and other components to form a whole product. If the primary movement is extension pipe contraction the joint can be preset at the factory. Metraflex expansion joint data model metragator page 2, 3 compensators page 4 bellows connector page 5 model mnlc page 6, 7 model mn page 8, 9 model mc page 10, 11, 12 metraloop page bellows designs bellow. Metal expansion joints and metal bellows hose master.
The basic constituent element of expansion joint, bellows, can be specified, considering on movement, pressure, temperature, service life and corrosion. The production of rubber bellows for expansion joints belongs to the contitech business unit air spring systems as both are similar rubber bellow products with textile reinforcement. A bellows expansion joint is an assembly of two or more bellows which help to tackle expansion or contraction in the system where it is designed to fit in. Bellows of special expansion joints are designed according to ejma code. An expansion joint is a device primarily formed by flexible bellows used to absorb movements in. Ultralon expansion joints can offer working temperatures from 300f. Adding accessories and end connections to the bellows increases its capabilities making the expansion joint functional for a wide range of applications. Rubber bellows are generally found in 2 types like single arc rubber bellow and multi arc rubber bellow and its comes with without both side flanges and other related accessories. These are usually anchors, tie rods, hinges or gimbal structures.
We have worked very closely with the licensor for many years to develop the designs and implement improvements to prolong the life of the expansion joints in this very. The vacuum ring is recommended when the expansion joint is used in negative pressure. Viii, division 1, 2001 edition bellows element geometry bellows material. Bellows expansion joint hard pipe loop design conditions pipe 6 inch schedule 40 movement 4 axial compression pressure 150 psi temperature 300. Our expertise and manufacturing capabilities include bellows type metal expansion joints and connectors, rubber expansion joints, te. Our expansion joints are known and trusted by clients the world over, with thousands of installations for clients like abb air preheater, samsung engineering, and general electric. When this movement is not absorbed by the piping system itself, an expansion joint is the perfect solution. Witzenmann, the inventor of the metal hose and founder of the metal hose and expansion joint industry is the top name in this area. A hinged, pinned and slotted expansion joint design is frequently used where large. Control rods are not designed to restrain bellows pressure thrust. The allowable movements shown are based on a minimum of 3000 nonconcurrent cycles. Consisting of flanged ends and a flexible section, much the same as a flanged metal bellows, the rubber expansion joint can absorb within its free length more.
Rubber expansion joints compensators are used as flexible connectors within pipe systems. Type of fabric expansion joint asiapacific supply co. F length of run 177 feet 98% less anchor load than bellows expansion joint 83% less anchor load than hard pipe loop 75% less space required than hard pipe loop drawn to scale x x. This guidebook is an informative and inspirational tool for the reliable specification and selection of the correct type of metallic expansion joints.
Click on the map below and learn about a member near you. The flexible element of an expansion joint, consisting of. The bellows bottom line is a publication of oakridge bellows for a free subscription sign up at. Table of contents the data on some of the expansion joints from metraflex are presented first in this guide. High quality braided flexible metal corrugated hose and metal bellows expansion joints. For lower pressure applications a series2 expansion joint will provide increased movement capability.
Control rods like limit rods can be designed to take full pressure thrust loads as well as loads imposed by the weight of the expansion joint. The units presented are standard products and range from the simplest single bellows expansion joints with weld ends to the more complicated universals, hinged and gimbal expansion joints. The design basis of expansion joints other than ushape bellows shall be submitted to stress engineer for approval. Standard materials include t304, 321, and 316 stainless steel, as well as inconel, monel, and other alloys.
Metal bellows expansion joints specification guide your trusted source worldwide 3. A bellows may also be designed to absorb mechanical. Since the pressure is on the outside of the bellows, more corrugations can be added to the design resulting in a joint capable of more movement. Expansion joint detail for 1 25 mm joint to provide adequate clearance between metal flanges and bellows for a 1in. All expansion joints shall be capable of at least 200 full coincident pressure and temperature cycles at design conditions and movements. Metal expansion joints thermal growth, equipment movement, vibration or pressure pulsation may generate movement in a piping system. Detail expansion joint modelling bellows hardware restraints.
Expansion joints bellows blueline expansion joints are three convolution connectors, available from 1 to 12 in diameter, that compensate for moderate movement or misalignment, have increased flexibility and can easily be installed in piping systems. Senior flexonics pathway is pleased to present this catalog of metal expansion joints from 2 pipe size 50mm nd to 144 diameter 3. Multiply bellows expansion joint with tie rods 932015 na mptr2 maximum working temperature 480 f rated for full vacuum nsf 372 lead free the wetted surface of this product contacted by consumable water contains less than one quarter of one percent 0. These bellows allow angular movement of the adjacent piping while restricting axial and lateral displacement. Hinged expansion bellows hinged expansion bellows are useful when support of an adjacent pipe spool by the expansion bellows. Metallic expansion joint catalog pdf version us bellows. Material complies with state codes and standards, where. Bellows were required to be designed in accordance with the rules for pressure design of unlisted components par. In line pressure balanced expansion joint two ply monitored bellows design temperature. Pathway has more experience with this process than any other expansion joint company.
The paper deals with dynamic stability and natural frequency of composite corrugated bellows expansion joint. This element is designed to absorb thermal movements that result from a change in temperature in a piping system. Gimbal, hinged, dual, and universal tied styles are construction options. Cover a device used to provide limited protection of the exterior surface of the bellows of an expansion joint from foreign. Download expansion joint brochures and catalogues belman as. The pressure supporting canvass consists of fabric and metal reinforcement, as wire or solid rings. Since the pressure thrust is in almost all cases substantially bigger than the bellows spring. Our expansion joints are designed to last as long as the system. Joints designs all expansion joints and bellows to ejma, asme b31. Pdf dynamic stability and natural frequency of composite.
The bellows bottom line practical advice on expansion joints by greg perkins sept 2012 this month torsion on expansion joints in piping systems understanding design options the bellows bottom line is a publication of oakridge bellows for a free subscription sign up at. Joint opening plus curb widths must be considered for. Newland, buckling of double bellows expansion joints under internal pressure, engineering failure analysis, elsevier, volume 12, page 387399. Protect with wet chloridefree insulation in addition. In this simplified formulae are developed by a thin walled pipe model.
Floating plate flangestype 66 unaflex type 66 expansion joints are provided with class 150 drilling carbon steel flanges awwa class d c207 floating on each end of the expansion joint. Bellows necks are flared vanstone to retain the flanges. Consult with american boa for the selection of the most economic expansion joint design. Pdf failure of 304 stainless bellows expansion joint. The mechanical forming, which is also known as roll forming, involves passing. Sealing problems and large space requirements of other expansion devices are eliminated with bellows expansion joints. Metal bellows expansion joint product specifications. Bellows expansion joints because the bellows expansion joint is required to absorb thermal andor mechanical movements, the bellows element must be. Series 1500 laminated bellows expansion joints are designed for installations where the principal movement is axial. Our standard material for the circular type bellows is austentic steel, that is, aisi 304 and 316. Standard joints are designed for 2 or 3 axial compression pipe expansion and 0. 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. Series epd dual expansion joints utilize two sets of bellows with a center anchor base, effectively doubling the axial motion capability of a single expansion joint.
The basic constituent element of expansion joint, bellows, can be specified, considering on movement, pressure, temperature, service life and corrosion rate required. This expansion joint design will accept large amounts of lateral offset in multiple planes. Blueline flexible couplings, expansion joints and bellows. Fmh expansion joints design of bellowsdesign of bellows the bellows is the flexible element of an expansion joint consisting of one or more convolutions and the end tangents. The pressure thrust tends to expand the bellows of the expansion joint.
The convoluted portion of an expansion joint is designed to flex when thermal movements occur in the piping system. Penflex delivers high quality products that lead the industry in wall thickness, providing for greater durability and improved resistance to chemical corrosion as well as improved reliability in high pressure applications. This will insure that the expansion joints will have a long life. Flexibility is provided by reducing thickness or increasing outside diameter of expansion joint. 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.
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