How did they get this dramatic of a change past the powerful expansion joint lobbyists. Ejma expansion joint manufacturers association, standards for. Expansion joint manufacturers association wikipedia. Ejma does not cover rubber bellows or metal hose design. Numerous researchers have conducted studies on bellows expansion joints with the help of standards such as asme and ejma. Joint manufacturers association, standards for expansion bellows. Standard specification for circular metallic bellows type. Bellows pressure carriers include low pressure exhaust bellows, 50 psi, 150 psi, and 300 psi. Welding is done by qualified welders using machines specially built for the purpose.
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 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. Design of bellows and bellows components shall be in accordance with ejma. Per ejma i need the allowable at design to check the calculated stresses. The ejma organization performs extensive technical research on a variety of topics concerning the design and. Triad bellows design and manufacturing uses bellows design software based on ejma 10th edition guidelines. Ejma standard is an internationally recognized advanced standard, which is used for almost all bellows standard. To become a member of ejma, a company must adhere to strict quality standards in all aspects of expansion joint design, fabrication and testing. Project standards and specifications page 2 of 9 rev. Multiply bellows is widely used because its flexibility and pressure tightness.
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. It utilizes the ability of a bellows to rotate in angular direction. Ejma was founded in 1955 to establish and maintain quality design and. Ejma 10th edition is the most current edition and supersedes all previous publications. For technical assistance please contact us or use the live help link on this page.
Ejma carries out extensive technical research and testing on many important aspects of expansion joint design and manufacturing. 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 asme curve was developed also using bellows fatigue data, but it provides design margins consistent with asme pressure equipment codes. Unreinforce design software for expansion joints bellows is available as. Triad bellows designs and manufactures metal bellows and metal bellows expansion joints in accordance with the expansion joint manufacturers associations latest 10th edition standards. Includes one copy of practical guide to expansion joints. Pipe loops are not held to this high of a standard. 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. Refer to ejma standards for proper guide spacing and anchor recommendations.
Bellows has been a ejma member since 2002 with representation on both the technical and management committees. Free technical support is available to all ejma standard 9th ed. Bellows design calculations are provided with each quotation. Ejma was founded in 1955 to establish and maintain quality design and manufacturing standards. The ejma bellows fatigue curve is a best fit curve based on data that wa. Uses bellows design software based on ejma 10th edition guidelines. 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. The standards are a combination of a variety of expansion joint manufacturers knowledge and experience. Other readers will always be interested in your opinion of the books youve read.
Custom stainless steel bellows expansion joint triad bellows. Good morning friends, i was looking for ejma 9th edition standard. 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 standard of aidyn duryea read about ejma standard pictures or see related. Ejma was founded in to establish and maintain quality design and manufacturing standards. Standards of the expansion joint manufacturers association, tenth edition 10th ejma adobe drm. It is essential that the weld in the bellows be as strong as the surrounding material. This ebook can only be opened on 1 device and no printing or copying of the content is allowed. Finally the validation of results of ejma design calculated value and fea value shows a very good agreement. Ejma standard stainless steel lateral corrugated bellow. 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.
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. The authority on expansion joints the ejma standards receive a free copy of a practical guide to expansion joints with each printed. Bellows vendors will often quote two different cycle lives for their bellows. Ejma standard universal hinge bellows expansion joint buy. Standards of the expansion joint manufacturers association. So, its the same method that we can find at ejma standards. The definitions are taken, in part, from the ninth edition of the ejma standards. Bellows shall be formed from solution annealed sheet confirming to the latest astm specification. Ejma standard pdf and on ejma standard pdf free download. Manufacture and test of seismic bellows for iter magnet. Based on customer requirement, design calculation can be made as per ejma standard and asme. The bellows and expansion joints can be tailor madeto meet specific requirements of the customer within the available product range. It was founded in 1955 to create and maintain a set of standards for quality expansion joint design and manufacturing.
Metallic expansion joints unisource manufacturing inc. Deepak g unreinforce bellows design calculation sheet ejma ninth edition client name. Bellows expansion joints are designed as per ejma standard. These standards combine the knowledge and experience of the associations. Ejma the expansion joint manufacturers association standards. Expansion joint unreinforce design software ejma standard.
Jul 14, 2019 ejma was founded in to establish and maintain quality design and manufacturing standards. Ejma standard of the expansion joint manufacturers association. Ejma standard universal hinge bellows expansion joint. We perform standard pressure tests on all our bellows to ensure the unit will not squirm in service. Tests are not mandatory by ejma, but it is highly recommended to perform a pressure or. Pressure thrust can be calculated by multiplying the working pressure by the effective area psig x stajdards.
A wide variety of ejma bellows expansion joint options are available to you, such as equal. Prior to 1988, coverage of metallic bellows expansion joints in asme b31. Ejma standard 1980 provides strength evaluation equations for multiply. The expansion joint manufacturers association is an organization of a metal bellows expansion joint manufacturers. Expansion bellow design as per ejma 93edn, 95a, 96e. International software development of bellows master ii and other compensator design software. The ejma standards are used worldwide as a reference for the proper selection and application of metallic bellows expansion joints. The ejma bellows fatigue curve is a best fit curve based on data that. Hyspan is a member of the ejma, and all hyspan products comply with the standards.
Design of bellows and bellows components shall be in accordance with ejma standards. This includes standard conversions in addition to constants used in calculations. Bellows shall be formed from solution annealed sheet confirming to. Metal bellows design software solutions mbdss version on customer requirement, design calculation can be made as per ejma standard and asme. Currently, our pipe expansion joints are being designed and manufactured per the 9th edition of the ejma standards. 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. However, the analytical treatment of its behaviours is difficult compared with that of singleply bellows, since the uncertainty of friction between plies exists. Ejma is the expansion joint manufacturers association. 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. Hedh is the standard reference source for heat transfer and heat exchanger design.
Ejma hand calculations x caesar ii intergraph cadworx. The ejma standards are recognized throughout the world as the authority on the proper selection and application of metallic bellows type. The ejma standards are recognized throughout the world as the authority on the proper. Modelling flexible bellows by standard beam finite elements diva. Ejma is the expansion joints manufacturers association. 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. Ejma 10th edition is the most current edition and supersedes all ejma standards 10th ed. Metal bellows cycle life ejma vs asme oakridge bellows. Refer to ejma standard for proper guide spacing and anchor recommendations. As an aid to the basic understanding of expansion joints the ejma publishes the practical guide to expansion joints.
Use our different data sheets as references to see which bellows will meet your needs. 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. 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. Hyspan expansion joints, expansion joint technical. When such a fatigue design basis is provided in the ejma standards. Bellows were required to be designed in accordance with the rules for pressure design of unlisted components par. Ejma used that curve to best predict bellows cycle life. Ejma 10th edition is the most current edition and supersedes all. The manufacturers warranty may be void if improper installation procedures have been used. Welcome to triad bellows stainless steel exhaust bellows data sheets page.
Bellows expansion joints manufactured to ejma 10th edition standards. Bellows circumferential membrane stress due to pressure. Bellows is to be hydraulically or expansion punched formed. Standards of the expansion joint manufacturers association, inc. The expansion joint manufacturers association, inc. Bellows expansion joints are employed in piping systems to absorb differential thermal expansion while containing the system pressure.
This document explains how metal bellows expansion joints function, correct applications, and handling, installation and safety standards. Ejma expansion joint manufacturers associaton member u. Ejma standard stainless steel dual axial corrugated bellow expansion joint. The axial movement capability is the result of the angular rotation of the bellows and their center to center distance. Bellows expansion joint design vs asme asme mechanical. Can someone please provide me this standard 9th or 8th edition as well. The rogue appendix 26 group came up with a curve that dropped below all points. Multiply bellows are well suited for those applications requiring low spring rate or where cyclical vibration may be a problem. The ejma standards can be applied to the remainder of the expansion joint regardless of the code selected for the bellows design.
Their bellows calculation method is most frequently used for metal bellows expansion joint 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. 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 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. This software has been developed as a standard customized package complying with the standards of both ejma ninth edition and asme. And it does not explain why his allowables dont jive.