In order for the expansion joint to provide the expected service, the pipe line must have the recommended num. With each copy of the ninth edition, you will receive ejma s practical guide to expansion joints, a pocket size primer based on ejma standards. The ejma standards are recognized throughout the world as the authority on the proper selection and application of metallic bellows type expansion joints for. The latter provides a significantly higher cycle life. Purchase of standards includes a free practical guide with each book. Bellows company team outside the houston, tx facility local phone. The ejma bellows fatigue curve is a best fit curve based on data that was available, so it provides an expected average cycle life. The other is in accordance with the standards of the expansion joint manufacturers association. The tenth edition standards combine the knowledge and experience of the leading manufacturers of expansion joints into an invaluable reference document. Our expansion joints are designed to last as long as the system. Ihs markit is your source for ejma standards and publications. American boa is a member of the expansion joint manufacturers association ejma and manufacturers expansion joints in accordance with the latest ejma addendum.
The ejma standards are recognized throughout the world as the authority on the proper selection and application of metallic bellows type. Twisting about the longitudinal axis of the expansion joint can reduce bellows life or cause expansion joint failure and should be avoided. The expansion joint manufacturers association is an organization of established manufacturers of metal bellows type expansion joints. Ejma standards in the design of singleply and multiply bellows of 102 dia. This ebook can only be opened on 1 device and no printing or copying of the content is allowed. Each expansion bellow shall be subjected to minimum hydrostatic test pressure equal to 1. Penflex expansion joints are manufactured in accordance with the expansion joint manufacturers association ejma standards, 10th edition,astm b31. Design of bellows for expansion joints is predominantly determined by movement, pressure, temperature, service life, materials and corrosion. Expansion fittings and loops for hvac piping spectrum health. Expansion joint is any device containing one or more bellows used to absorb dimensional changes, such as those caused by thermal expansion or contraction of a pipeline, duct or vessel. Standards of the expansion joint manufacturers association, inc. Expansion joint for connecting the reciprocating or pulsating machinery shall be able to absorb equipment vibration and vibration and the mechanical resonant condition.
Sealing problems and large space requirements of other expansion devices are eliminated with bellows expansion joints. All expansion bellows covered by this certificate are approved for load cycles. The term fabric expansion joint is a little misleading, in that it covers a wider range of products and materials than just fabrics. The wtandards resistance factor or working spring rate is shown in lbs per inch of lateral offset. Expansion joint manufacturers association wikipedia. Ejma standards pdf free 102 on escape the fate mexico street. To become a member of ejma, a company must adhere to strict quality standards in all aspects of expansion joint design, fabrication and testing. With each printed copy of the tenth edition, you will receive ejma s practical guide to expansion joints, a pocket size primer based on the ejma s standards. Ejma was founded in to establish and maintain quality design and manufacturing standards. Pdf buckling considerations for ushaped bellows utilized in. It was founded in 1955 to create and maintain a set of standards for quality expansion joint design and manufacturing. Ejma 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.
We can either adapt the expansion joints in this catalogue to comply with these design codes and. Stability, fatigue and optimization of thinwalled structures under. Bellows of special expansion joints are designed according to ejma code. Asme section viii division 1 appendix 26 june 2004 addenda. Ejma is the expansion joint manufacturers association. Includes one copy of practical guide to expansion joints. Also, as an active member of the expansion joint manufacturers association, keb. Our mission is to maintain quality design and manufacturing standards. Metal expansion joints and connectors, rubber expansion joints, te. Designing with expansion joints 7 pressure thrust ejma which types of expansion joints have this problem. Asiapacific canada europe middle east south america united.
Maximum velocity for bellows without sleeves shall be in accordance with ejma 9th adition table 4. The ejma standards are intended for 3pplieation to metallic bellows expansion joints. However, it is useful as a generic title for expansion joints which are nonmetallic, and used in ducts at low pressures. Garlock expansion joints offer superior performance, reliability and service life. Ejma module package lauterbach verfahrenstechnik gmbh. Jul 14, 2019 the wtandards resistance factor or working spring rate is shown in lbs per inch of lateral offset. Jan 01, 2019 conventionally, design and manufacturing of the formed bellows are extensively addressed in standards of expansion joint manufacturers association ejma. Ejma which types of expansion joints have this problem. Standards of the expansion joint manufacturers association inc. Expansion joints should not be located at any point in a piping system that would impose torque to the expansion joint as a result of thermal change or settlement. Fabric expansion joints are used primarily to contain gaseous fluids. The expansion joint manufacturers association, inc. Jun 26, 2020 the expansion joint manufacturers association is an organization of established manufacturers of metal bellows type expansion joints.
The ejma standards are used worldwide as a reference for the proper selection and application of metallic bellows expansion joints. This catalog outlines the selection and installation of our metal bellows. Type of expansion joint advantages disadvantages bellows ejma expansion joint manufacturers association no packing leaks inexpensive custom fabrications can be done quickly high temperatures. Ejma code 16 expansion joint manufacturing association ninth edition. Using a bellows configuration corresponding to standard, e. Ejma carries out extensive technical research and testing on many euma aspects of expansion joint design and manufacturing. Ejma carries out extensive technical research and testing on many important aspects of expansion joint design and manufacturing. Modelling flexible bellows by standard beam finite elements diva. The tenth edition standards combine the knowledge and experience of the leading manufacturers of expansion joints into an invaluable. Bellows design analysis is performed in accordance with various design codes including. The ejma organization performs extensive technical research on a variety of topics concerning the design and manufacturing of expansion joints. In addition to the ejma standards, they will also design in.
It is also integrated with our design software to ensure the integrity of all materials used against the design code. The expansion joint shall be able to handle the axial, lateral, angular or rotational movements or a combination of one or more above, at all operating conditions. Designed specifically to suit the customer project. Moreover, expansion joints serve as assembly aids for pipe elements such as valves, where they are used as dismantling pieces or couplings. American expansion joint manufacturers association ejma criteria. Ejma was founded in 1955 to establish and maintain quality design and manufacturing standards. In addition, the guidance provided by the rules of the expansion joint manufacturers association standards ejma with regard to squirm are. Bellows were required to be designed in accordance with the rules for pressure design of unlisted components par. To prevent the bellows failure chances we have provide. The guide is intended to provide users with a basic understanding of expansion joints. Column squirm is defined as a gross lateral ejjma of the centre section of the bellows.
Ejma carries out extensive technical research and testing on many important aspects of expansion joint design and. This knowledge contributes to providing new versions of the ejma book of standards. Ejmaexpansion joint manufacturers association global ihs. Designing with expansion joints 8 pressure thrust for a bellows type expansion joint, the pressure. The ejma standards are recognized throughout the world as the authority on the proper selection and application of metallic bellows type expansion joints for safe and reliable piping and vessel installation. The industry has kept abreast of the technological advances in rubber compounding and synthetic fabrics to provide rubber expansion joints having advantages not available in other materials. Prior to 1988, coverage of metallic bellows expansion joints in asme b31. The allowable movements shown are based on a minimum of 3000 nonconcurrent cycles. Single tied metallic expansion joints with twoply alloy bellows. Single hinged expansion joint and duct work assembly. Standards of the expansion joint manufacturers association.
Apr 09, 2021 ejma is the expansion joint manufacturers association. At the same time, expansion joints allow nearly forceand torquefree connection of pipes to sensitive fittings, appliances and equipment e. In 1974, asme rekindled a 1966 effort to develop design rules and performance equations covering expansion joints for use in heat exchangers and pressure vessels. Thanks the expansion joint manufacturers association is an organization of a metal bellows expansion joint manufacturers.
The standards are a combination of a variety of expansion joint manufacturers knowledge and experience. For lower pressure applications a series2 expansion joint will provide increased movement capability. Designing with expansion joints 8 pressure thrust for a bellows type expansion joint, the pressure thrust force is the effective thrust area recommended by the manufacturer times the pressure. Garlock fluid sealing products technical manual piping. These standards combine the knowledge and experience of the associations technical committee and are available to. Apr 09, 2020 expansion joint manufacturers association, although a new ejmma is typically free of any faults or defects, new dont let a few small mistakes erode the value of your growing book collection. In addition, pressure drops, heat loss, high anchor loading together with the large space. Includes one copy of practical guide to expansion joints i need ejma standard 10th edition. Every expansion joint produced by senior flexonics pathway is designed and manufactured in strict accordance with ejma standards. Multiaxial fatigue life prediction of bellow expansion joint du. Ejma is the global association of leading expansion joint manufacturers and suppliers. Expansion joint engineering according to design codes such as ejma, asme, ped, en 445, en 149147 etc. The expansion joint manufacturers association ejma, the authority on metal expansion joints, has revised the standards in the latest 10th edition ejma standards are recognized throughout the world as the authority on the proper selection and application of metallic bellows type expansion joints for safe and reliable piping and vessel installation.
Senior flexonics pathway is pleased to present this catalog of metal expansion joints from 2 pipe size 50mm nd to 144 diameter 3. In nuclear applications, design of the bellows shall comply with standard nuclear design codes such as asme section iii, rccmr etc, which follow design by analysis. Asiapacific canada europe middle east south america. We would be pleased to provide you with designs of other. Designing with expansion joints becht engineering company, inc. 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. Doing business with an ejma member takes the risk out of vendor selection, when you insist on ejma membership, you can be sure that you are. Pipe guides fmh expansion joints 5 proper alignment of the adjoining pipe is of essential importance to the correct functioning of an expansion joint. The expansion joint manufacturers association is an organization of a metal bellows expansion joint manufacturers. Indicate maximum temperature and pressure rating, and maximum expansion.
A practical and cost effective means of achieving flexibility in a piping design is through the application of expansion joints. It is calculated as either lb or lu plus length of pipe ends. Expansion joints provide an excellent solution for isolation of settlement, seismic deflection, mechanical vibration and sound attenuation transmission produced by a range of equipment. The ej were designed according to the expansion joints manufacturer association code ejma, the diameters range from 0. Ayvaz is one of the biggest metal bellowed expansion joint. An evaluation of ejma stress calculations for unreinforced. This ebook can only be opened on 1 device and no printing or copying of the content is. These standards combine the knowledge and experience of the associations technical committee and are available to assist users, designers, and others in the selection and application of expansion joints for safe and reliable piping and vessel installation. Ejs designs every expansion joint in compliance with ejma standards. All units meet the standards of the expansion joint manufacturers association ejma and military specification mile178. Design, manufacturing and analysis of metal expansion bellows. Bellows are designed in accordance with the ejma expansion joint manufacturer association, asme b31.
1337 346 1053 724 178 69 226 1275 667 500 857 783 1005 1043 395 547 990 362 647 315 392 783 87 585 260 1415 157 1353 1114