This element is designed to absorb thermal movements that result from a change in temperature in a piping system. The expansion joint manufacturers association is an organization of a metal bellows expansion joint manufacturers. All standards, all students ifrs standards the annotated ifrs standards nas standards api. The minimum ndttesting and inspection requirements for bellows shall be as per the attached quality plan. We had full access to inhouse software for an older version of ejma code. Can someone please provide me this standard 9th or 8th edition as well. Technical assistance hyspan expansion joints, bellows. Jul 14, 2019 leave a comment on ejma standards free pdf ejma standards. Papers presented at aspect 90, a conference organized by the society for underwater technology and held in. Historically, designers have put large factors of safety on the number of design cycles for bellows, which was in part justified since there was no design margin in the ejma fatigue curve. Since 1958 this organization has published the standards which. Ejma the expansion joint manufacturers association standards. Ejma used that curve to best predict bellows cycle life.
Ejmastandards expansion joint manufacturers association. The ejma standards are recognized throughout the world as the authority on the proper selection and application of metallic bellows type expansion joints for. Papers presented at aspect 90, a conference organized by the society for underwater technology and held in aberdeen, scotland, may 3031, 1990. Ejma standard of the expansion joint manufacturers association. Bellows are one of the most efficient energy absorbing elements for engineering system. The authority on expansion joints the ejma standards receive a free copy of a practical guide to expansion joints with each printed. Bellows shall be formed from solution annealed sheet confirming to the latest astm specification. Section iii, asme section viii, astm e165 and asme b31. The standard pressure test is performed at one and a half times the operating pressure. How did they get this dramatic of a change past the powerful expansion joint lobbyists. Includes one copy of practical guide to expansion joints. And it does not explain why his allowables dont jive. It is essential that the weld in the bellows be as strong as the surrounding material. 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.
Pressure thrust can be calculated by multiplying the working pressure by the effective area psig x stajdards. The basic flexible element of an expansion joint is the metal bellows, which is flexible on all. The ejma bellows fatigue curve is a best fit curve based on data that was available, so it provides an expected average cycle life. These standards combine the knowledge and experience of the associations technical committee and are available to assist users, designers, and. Standards of the expansion joint manufacturers association, inc. Bellows vendors will often quote two different cycle lives for their bellows.
Over thirtyfive diametrical sizes, multiple segments, five end plate styles, and high vacuum flanges can be assembled in numerous configurations, without the high cost and long lead time associated with custom assemblies. Numerous researchers have conducted studies on bellows expansion joints with the help of standards such as asme and ejma. Bellows shall be formed from solution annealed sheet confirming to. 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. Custom metal expansion joints and stainless steel bellows assemblies for the aerospace, cryogenic, various engineering and manufacturing industries. Expansion bellow design as per ejma 93edn, 95a, 96e. Jul 26, 20 bellows vendors will often quote two different cycle lives for their bellows. The other is in accordance with the standards of the expansion joint manufacturers association. Ejma is an organization of the leading international manufacturers of metal bellows expansion joints. Leave a comment on ejma standards free pdf ejma standards. Design of bellows and bellows components shall be in accordance with ejma standards. Analysis and design of multiply metallic bellows by do ubido core.
Standards of the expansion joint manufacturers association, tenth edition 10th ejma adobe drm. A bellows may also be designed to absorb mechanical. Members can help customers determine the best expansion joint design for their specific application. It provides specific code coverage for metallic bellows expansion joints by adopting, with exceptions and additions, a widely used industry standard for expansion joints, the ejma standards. Ejma was founded in to establish and maintain quality design and manufacturing standards.
The overall philosophy of appendix x was to adopt the ejma standards with modifications that the code committee felt were necessary to make the ejma. Standard specification for circular metallic bellows type. Bellows has been a ejma member since 2002 with representation on both the technical and management committees. Design of bellows and bellows components shall be in accordance with ejma. Ejma the expansion joint manufacturers association, inc. The expansion joint manufacturers association is an organization of established manufacturers of metal bellows type expansion joints. It discusses the parameters and conditions specified by the piping system designer and how to design an expansion joint as a costeffective component. Expansion joint manufacturers association wikipedia. Bellows is to be hydraulically or expansion punched formed. Ejma expansion joint manufacturers associaton member u. Ejma the expansion joint manufacturers association. The most optimum bellows is designed for the operating and upset conditions, has a high instability pressure, and has only one longseam weld.
The pressure stresses include circumferential hoop stress in the bellows tangent as well as the convolutions. Ejma standards ejma standards pdf ejma ejma 9th edition download ejma standard 9th ed. Ejma was founded in 1955 to establish and maintain quality design and manufacturing standards. These standards combine the knowledge and experience of the associations. The organization is dedicated to the advancement of expansion joints through cooperative empirical and analytical programs.
The ejma standards are recognized throughout the world as the authority on the proper selection and application of metallic bellows type. These standards combine the knowledge and experience of the associations technical committee and are available. The rogue appendix 26 group came up with a curve that dropped below all points. Ejma was founded in 1955 to establish and maintain quality design and. Metal bellows cycle life ejma vs asme oakridge bellows. As a result, ejma members are motivated to provide exceptional service on a consistent basis. Pipe loops are not held to this high of a standard. This includes standard conversions in addition to constants used in calculations. The tenth edition standards combine the knowledge and experience of the leading manufacturers of expansion joints into an invaluable. Standard bellows offers a large selection of stock bellows assemblies to meet a variety of design needs. Piping design and analysis influence on pipe support selection and design is an overview on piping design and analysis, including factors that effect overall configuration, piping layout, the total system, as well as an introductory into pipe stress analysis flexibility concerns and other design considerations. This pressure test is not mandatory per ejma, therefore, the customer must specify if this test is required. Good morning friends, i was looking for ejma 9th edition standard.
The new 10th edition ejma standard is now available both in printed version and ereader format. Ejma standards in the design of singleply and multiply bellows of. The latter provides a significantly higher cycle life. The ejma standards are recognized throughout the world as the authority on the proper. 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. Per ejma i need the allowable at design to check the calculated stresses. Ejma and its members are a valuable resource for technical information. Ejma members maintain an excellent history of customer satisfaction. Expansion joint application and design course covers how to provide flexibility in the piping system by employing expansion joints to accommodate thermal expansion and contraction of sections of pipes or ducts. This ebook can only be opened on 1 device and no printing or copying of the content is allowed. Ejma also functions as a forum for discussion and correlation of technical information from members and outside sources including engineering societies, universities, industry, and government.
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