Ejma expansion joint manufacturers association, standards for. Good morning friends, i was looking for ejma 9th edition standard. Triad bellows design and manufacturing uses bellows design software based on ejma 10th edition guidelines. Jul 14, 2019 ejma was founded in to establish and maintain quality design and manufacturing standards. Ejma carries out extensive technical research and testing on many important aspects of expansion joint design and manufacturing. 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. For technical assistance please contact us or use the live help link on this page. And it does not explain why his allowables dont jive. Ejma does not cover rubber bellows or metal hose design. We perform standard pressure tests on all our bellows to ensure the unit will not squirm in service. 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 authority on expansion joints the ejma standards receive a free copy of a practical guide to expansion joints with each printed.
Prior to 1988, coverage of metallic bellows expansion joints in asme b31. Jul 26, 20 the ejma bellows fatigue curve is a best fit curve based on data that was available, so it provides an expected average cycle life. Uses bellows design software based on ejma 10th edition guidelines. Design of bellows and bellows components shall be in accordance with ejma standards. Bellows has been a ejma member since 2002 with representation on both the technical and management committees. Bellows shall be formed from solution annealed sheet confirming to. Ejma was founded in to establish and maintain quality design and manufacturing standards. The rogue appendix 26 group came up with a curve that dropped below all points. Their bellows calculation method is most frequently used for metal bellows expansion joint design.
This document explains how metal bellows expansion joints function, correct applications, and handling, installation and safety standards. Deepak g unreinforce bellows design calculation sheet ejma ninth edition client name. Metal bellows design software solutions mbdss version on customer requirement, design calculation can be made as per ejma standard and asme. Ejma hand calculations x caesar ii intergraph cadworx. Free technical support is available to all ejma standard 9th ed. Ejma standard universal hinge bellows expansion joint. Numerous researchers have conducted studies on bellows expansion joints with the help of standards such as asme and ejma. Hedh is the standard reference source for heat transfer and heat exchanger design.
The authority on expansion joints 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. A wide variety of ejma bellows expansion joint options are available to you, such as equal. Expansion joint unreinforce design software ejma standard. Use our different data sheets as references to see which bellows will meet your needs. Custom stainless steel bellows expansion joint triad bellows. Bellows vendors will often quote two different cycle lives for their bellows. The ejma organization performs extensive technical research on a variety of topics concerning the design and. Ejma 10th edition is the most current edition and supersedes all ejma standards 10th ed. Ejma standard universal hinge bellows expansion joint buy. The bellows and expansion joints can be tailor madeto meet specific requirements of the customer within the available product range. How did they get this dramatic of a change past the powerful expansion joint lobbyists.
It was founded in 1955 to create and maintain a set of standards for quality expansion joint design and manufacturing. This includes standard conversions in addition to constants used in calculations. Hyspan expansion joints, expansion joint technical. Ejma expansion joint manufacturers associaton member u. Ejma standard of the expansion joint manufacturers association. Bellows is to be hydraulically or expansion punched formed.
Ejma used that curve to best predict bellows cycle life. The ejma standards are recognized throughout the world as the authority on the proper selection and application of metallic bellows type. International software development of bellows master ii and other compensator design software. Per ejma i need the allowable at design to check the calculated stresses. The difference between the large id of the bellows and the small id of the bellows will provide an area upon which the pessure will develop a compressive load on the nozzle. You can also choose from welding, male ejma bellows expansion joint, as well as from stainless steel, carbon steel ejma bellows expansion joint, and whether ejma bellows expansion joint is forged, or casting. Ejma the expansion joint manufacturers association standards. Ejma standard universal hinge bellows expansion joint, find complete details about ejma standard universal hinge bellows expansion joint,hinge expansion joint,bellows expansion joint,expansion joint from pipe fittings supplier or manufacturertianjin wide metal hose co. Includes one copy of practical guide to expansion joints. This software has been developed as a standard customized package complying with the standards of both ejma ninth. Bellows expansion joint design vs asme kstaylor mechanical 4 dec 01 16. 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. The standards are a combination of a variety of expansion joint manufacturers knowledge and experience. Nov, 2018 standard edition was, of necessity, somewhat brief and covered only the ejma tm standards are intended for application to metallic bellows expansion joints.
The ejma standards can be applied to the remainder of the expansion joint regardless of the code selected for the bellows design. Bellows expansion joints manufactured to ejma 10th edition standards. The axial movement capability is the result of the angular rotation of the bellows and their center to center distance. Unreinforce design software for expansion joints bellows is available as. 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. The asme curve was developed also using bellows fatigue data, but it provides design margins consistent with asme pressure equipment codes. Triad bellows designs and manufactures metal bellows and metal bellows expansion joints in accordance with the expansion joint manufacturers associations latest 10th edition standards. Ejma expansion joint means this expansion joint is designed or tested by ejma calculation, to ensure the feasibility and safety the ejma standards are used worldwide as a reference for the proper selection and application of metallic bellows expansion joints. Standards of the expansion joint manufacturers association, tenth edition 10th ejma adobe drm. Bellows were required to be designed in accordance with the rules for pressure design of unlisted components par. Based on customer requirement, design calculation can be made as per ejma standard and asme. Bellows circumferential membrane stress due to pressure.
The ejma standards are used worldwide as a reference for the proper selection and application of metallic bellows expansion joints. Ejma 10th edition is the most current edition and supersedes all previous publications. Can someone please provide me this standard 9th or 8th edition as well. The authority on expansion joints the ejma standards are recognized throughout the world as the authority on the proper selection and application of metallic bellows type expansion joints for. It utilizes the ability of a bellows to rotate in angular direction. Design of bellows and bellows components shall be in accordance with ejma. Currently, our pipe expansion joints are being designed and manufactured per the 9th edition of the ejma standards. Pipe loops are not held to this high of a standard. Pressure thrust can be calculated by multiplying the working pressure by the effective area psig x stajdards. 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 definitions are taken, in part, from the ninth edition of the ejma standards. Ejma was founded in 1955 to establish and maintain quality design and manufacturing standards. However, the analytical treatment of its behaviours is difficult compared with that of singleply bellows, since the uncertainty of friction between plies exists. Multiply bellows are well suited for those applications requiring low spring rate or where cyclical vibration may be a problem.
The manufacturers warranty may be void if improper installation procedures have been used. Ejma standard of aidyn duryea read about ejma standard pictures or see related. Bellows pressure carriers include low pressure exhaust bellows, 50 psi, 150 psi, and 300 psi. These standards combine the knowledge and experience of the associations. Design calculation for four types expansion metal bellows like unreinforced, reinforced, rectangular and toroidal. Expansion joint manufacturers association wikipedia. The ejma bellows fatigue curve is a best fit curve based on data that wa. Standard specification for circular metallic bellows type. Whether youve loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them. To become a member of ejma, a company must adhere to strict quality standards in all aspects of expansion joint design, fabrication and testing.
Ejma standard is an internationally recognized advanced standard, which is used for almost all bellows standard. Joint manufacturers association, standards for expansion bellows. Bellows shall be formed from solution annealed sheet confirming to the latest astm specification. Our dual axial expnasion joint works in the same way a hinged expansion joint does. 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. Standard edition was, of necessity, somewhat brief and covered only the ejma tm standards are intended for application to metallic bellows expansion joints. When such a fatigue design basis is provided in the ejma standards. Hyspan is a member of the ejma, and all hyspan products comply with the standards. Ejma the expansion joint manufacturers association, inc.
Refer to ejma standard for proper guide spacing and anchor recommendations. The expansion joint manufacturers association is an organization of a metal bellows expansion joint manufacturers. Metal bellows cycle life ejma vs asme oakridge bellows. Modelling flexible bellows by standard beam finite elements diva. It is essential that the weld in the bellows be as strong as the surrounding material. Ejma was founded in 1955 to establish and maintain quality design and.
Ejma standard pdf and on ejma standard pdf free download. So, its the same method that we can find at ejma standards. Ejma 10th edition is the most current edition and supersedes all. Standards of the expansion joint manufacturers association, inc. Ejma is the expansion joint manufacturers association. Bellows design calculations are provided with each quotation. Standards of the expansion joint manufacturers association. Other readers will always be interested in your opinion of the books youve read. This software has been developed as a standard customized package complying with the standards of both ejma ninth edition and asme. Ejma expansion joint manufacturer association latest standard 9th edition and asme.
Finally the validation of results of ejma design calculated value and fea value shows a very good agreement. Bellows expansion joints are employed in piping systems to absorb differential thermal expansion while containing the system pressure. The other is in accordance with the standards of the expansion joint manufacturers association. Here by adding the inner liner in the bellows gives the better results and performance achieved then the conventional. Do not use chains or any lifting device directly on the bellows or bellows cover.
Project standards and specifications page 2 of 9 rev. This ebook can only be opened on 1 device and no printing or copying of the content is allowed. Ejma standard universal hinge bellows expansion joint, find complete details about ejma standard universal hinge bellows expansion joint,hinge expansion joint, bellows expansion joint,expansion joint from pipe fittings supplier or manufacturertianjin wide metal hose co. The ejma bellows fatigue curve is a best fit curve based on data that. Metallic expansion joints unisource manufacturing inc. Bellows expansion joints are designed as per ejma standard. Bellows expansion joint design vs asme asme mechanical.
Welding is done by qualified welders using machines specially built for the purpose. Our product the metal bellows designs is only of its kind in the global market which has been specially developed to cater to the design analysis of the expandable metal bellows joints design. Ejma standard stainless steel lateral corrugated bellow. Welcome to triad bellows stainless steel exhaust bellows data sheets page. The latter provides a significantly higher cycle life. Ejma standard 1980 provides strength evaluation equations for multiply.