The authority on expansion joints the ejma standards receive a free copy of a practical guide to. B6 guardian 306 ezflo garlock guardian 306 ezflo spooltype expansion joints feature an fep lining that is fused to the body of the expansion joint. Axial expansion joints which are designed to absorb large movements, can contain one, two or several bellows in one unit, and larger movements can also be achieved by pretensioning or by installing several expansion joints on the pipe section. 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. Metallic expansion joint project standards and specifications page 3 of 9 rev. A bellows may also be designed to absorb mechanical movements. These are specifically designed to address vibration and movement, and also have excellent noise reduction capabilities. Expansion joint selection expansion between the restraining rods are compensated within the. A comparison of the asme code and the ejma standards is given by hanna 11, concluding that the two conform quite well in most aspects. 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. The expansion joint manufacturers association is an organization of a metal bellows expansion joint manufacturers. Ejma is an organization of the leading international manufacturers of metal bellows expansion joints.
The authority on expansion joints the ejma standards receive a free copy of a practical guide to expansion joints with each printed. Designing with expansion joints 8 pressure thrust for a bellows type expansion joint, the pressure. An expansion joint or movement joint is an assembly designed to safely absorb the temperatureinduced expansion and contraction of construction materials, to absorb vibration, to hold parts. In the following pages examples of good practice in the use of expansion joints in dierent pipe systems are. The hinges and hinge pins must be designed to restrain the thrust of the expansion joint due to internal pressure and extraneous forces, where applicable. The list of acronyms and abbreviations related to ejma expansion joint manufactures association. Good morning friends, i was looking for ejma 9th edition standard. Expansion joint cyclic deflections and cycle life u.
Nonmetallic expansion joints division and of the expansion joint manufacturers association ejma feel that expansion joints are the forgotten components of many piping systems. Pdf optimization and standardization of flanged and flued. Axial expansion joints perfect for axial movements belman. The hinged unit will limit bending to only one plane, and the gimbal will permit bending in all planes. Assemblies not capable of restraining the pressure thrust of the system. The expansion joint manufacturers association is an organization of. Hyspan expansion joints, expansion joint technical. Expansion joint an expansion joint is a complete unit with metal bellows or rubber bellows and end fittings, plus, optionally, liner, cover and external hardware. Expansion joint replacement is also available if the current product has failed or needs to be replaced. Ejma standard of the expansion joint manufacturers association. Tutorial on modeling of expansion joints using caepipe. Select the appropriate pipe expansion joint that meets the movement criteria. Design, manufacturing and analysis of metal expansion bellows.
Expansion joint replacement is also available if the current product. Typical media that fabric expansion joints will get subjected to are. Standards of the expansion joint manufacturers association. Expansion joint manufacturers association rmw mechanical 28 may 11 09. Jul 22, 2015 the expansion joint manufacturers association, inc. Design and thermal analysis of thermal expansion joint in. All units meet the standards of the expansion joint manufacturers association ejma and. These standards combine the knowledge and experience of the associations technical committee and are available. The bellows is the flexible element of an expansion joint consisting of one or more. Metal expansion joints and connectors, rubber expansion joints, te. As a result, the expansion joint is very flexible, with up to 30% greater ability to. The expansion joint is constructed of high strength nylon tire cord without any metal reinforcement. Crn certification availability wide range of metallurgy exhaust applications engineered movements and cycle life ejma guideline design criteria.
When thermal expansion or other movements want to bend a pipe, in order to lower stresses, a controlled bending point can be added with a hinge or gimbal pipe expansion joint. A hinged expansion joint contains one bellow and is designed to permite angular rotation in one plane only, by the use of a pair of pins through hinge plates attached to the expansion joint ends. To insure the highest quality bellows for the least cost, all movement conditions must be taken into account. Expansion joints explained meccom industrial products. The data on some of the expansion joints from metraflex are presented first in this.
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. Receive a free copy of a practical guide to expansion joints with each printed copy of the tenth edition, you will receive ejmas practical guide to expansion joints, a pocket size primer based on ejma standards. Expansion joint manufacturers association pipelines. 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. An expansion joint or movement joint is an assembly designed to hold parts together while safely absorbing temperatureinduced expansion and contraction of building materials, and vibration, or to allow movement due to ground settlement or seismic activity. The coefficient list, graphical chart and calculation example are shown on the. Expansion joint manufacturers association wikipedia. Complete document standards of the expansion joint manufacturers association, inc. The expansion joint manufacturers association is an organization of established manufacturers of metal bellows type expansion joints. Two random variables x and y are jointly continuous if there exists a nonnegative function fxy. The expansion joints were shipped minus the shipping bars that usually hold the joint to a specific over all length.
Joint probability density function joint continuity pdf. Designing with expansion joints becht engineering company, inc. In the above definition, the domain of fxyx,y is the entire r2. Optimization and standardization of flanged and flued expansion joint design article pdf available in journal of pressure vessel technology 14 march 2019 with 556 reads how we measure reads. Below are the illustrations of the typical situations for employing simple expansion joint type of bellows depending upon the application and configuration of the piping profile. The main use of single expansion joint in a piping system is. It is based upon the method found in ejma expansion joint manufacturers association. Designing with expansion joints 7 pressure thrust ejma which types of. The thin joint is analysed in accordance with asme viii, division 1 appendix 26. Expansion joint examples using hinged or gimbal expansion joints. Analysis of the flue gas humidity contents of soot or fly ashes flushingwashing of ducts. The expansion joints are used to dissipate the energy during contraction or expansion in pipes.
Receive a free copy of a practical guide to expansion joints with each printed copy of the tenth edition, you will receive ejmas practical guide to expansion joints, a pocket size primer. An evaluation of ejma stress calculations for unreinforced. Different types of expansion joints are widely used in piping industries. Modelling flexible bellows by standard beam finite elements. Expansion joint engineering according to design codes such as ejma, asme, ped, en 445, en 149147 etc. Standards of the expansion joint manufacturers association, tenth edition 10th ejma adobe drm. Round, multilayered dekomte metallic expansion joint, nominal pressure pn10, with nominal diameter dn500 and up to 5,3 angular movement, weld ends made from 1. A practical guide to expansion joints cern document server. Expansion joint examples using hinged or gimbal expansion. Ejmathe expansion joint manufacturers association, inc. Leave a comment on ejma standards free pdf ejma standards. Ejma the expansion joint manufacturers association standards 2008 ejma expansion joint manufacturers association download bok. The expansion joint in the above photo runs through the brick pavers as well as through the structural slab that supports the plaza. Bellow material code letter material code short name astm aisi name max.
Ejma standards ejma standards pdf ejma ejma 9th edition download ejma standard 9th edition ejma standard 9th ed. Ejma was founded in 1955 to establish and maintain quality design and manufacturing standards. Depending on the nominal diameter and length, axial expansion joints have the ability to absorb minor. This catalog outlines the selection and installation of our metal bellows. Designing with expansion joints 7 pressure thrust ejma which types of expansion joints have this problem. Installation guidelines section this section provides information about. 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. X and y are jointly continuous with joint pdf fx,y e. Definition of the use of expansion joints bellows in piping. It was founded in 1955 to create and maintain a set of standards for. Include the designations for the type xs for xflexsingle, drain connection d, and purge connection p. The expansion joint manufacturers association, inc. As i know, the ejma shall be subject to appendix 26 in asme sec viii. Air clean dust content chemical load by acids, solvents, etc.
Ejma tolerances for the installation and manufacture of. Ejma standards and most reliable expansion joint manufacturers catalogs provide numerous examples to assist. However, some significant differences exist and are discussed. The guide is intended to provide users with a basic understanding of expansion joints. The ejma standards are recognized throughout the world as the authority on the proper selection and application of. Waterproofing is handled on the structural slab by a buried waterproofing membrane. Examples of movement conditions that typically occur in a piping system are. This covers detailed calculation from ejma expansion joint manufacturers association, design, modelling, thermal and structural analysis of axial type expansion joint. Joint pdf calculation example 1 consider random variables x,y with pdf fx,y such that fx. Ejma defines the bellows tangent membrane stress due to pressure as s1.
The availability of supporting structures for anchoring and guiding of the piping, and the direction and magnitude of thermal movements to be absorbed must be considered when selecting the type and. Typical movement conditions that occur in a piping system are. A proper specification for a bellows pipe expansion joint should reflect what the actual system movements will be. Both the ejma expansion joint manufacturer association standards and most reliable pipe expansion joint manufacturers catalogues provide numerous examples to assist the user in this effort. Purchase of standards includes a free practical guide with each book. The list of acronyms and abbreviations related to ejma expansion joints manufacturers association.
Both the ejma standards and most reliable pipe expansion joint manufacturers catalogs provide numerous examples to assist the user in this effort. Ejma 10th edition, the latest revision, what has changed. The expansion joint bisects all of the building elements including the structural slab, membrane, and wear course bricks. Each joint is designed to consume 2 of contration and expansion total 4 movement. With each copy of the ninth edition, you will receive ejmas practical guide to expansion joints, a pocket size primer based on ejma standards. This product is designed for the chemical processing and. The tenth edition standards combine the knowledge and experience. Ejma the expansion joint manufacturers association.
The expansion joint manufacturers association ejma, the authority on metal expansion joints, has revised the standards in the latest 10 th 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. It was founded in 1955 to create and maintain a set of standards for quality expansion joint design and manufacturing. American boas main competitive priorities for the expansion joint market are service. These standards combine the knowledge and experience of the associations technical committee and are available to assist users, designers, and others in the.
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