This expansion joint is made up of two articulated bellows joined by an intermediate sleeve. 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 flexible header of wabocrete ii coupled with wabosiliconeseal make it an ideal expansion joint system for the new construction or repair of existing joints. A practical and cost effective means of achieving flexibility in a piping design is through the application of expansion joints. Apr 09, 2020 ejma standards pdf documents similar to ejma 9th standards of expansion joint manufacturers association 9h. Detailed calculations to validate design in accordance with latest edition of the ejma standards are.
Penflex expansion joints are manufactured in accordance with the expansion joint manufacturers association ejma standards, 10th edition,astm b31. 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. Asiapacific canada europe middle east south america united. Witzenmann, the inventor of the metal hose and founder of the metal hose and expansion joint industry is the top name in this area. The allowable movements shown are based on a minimum of 3000 nonconcurrent cycles. Ejma carries out extensive technical research and testing on many important aspects of expansion joint design and. Senior flexonics pathway is pleased to present this catalog of metal expansion joints from 2 pipe size 50mm nd to 144 diameter 3. These expansion joints enable angular rotation on any plane and can also absorb large lateral movements, which will depend on the central sleeve length. Expansion joint for connecting the reciprocating or pulsating machinery shall be able to absorb equipment vibration and vibration and the mechanical resonant condition. Do not weld in the near vicinity of a nonshrouded expansion joint without protecting the expansion joint from damaging weld splatter. The ejma standards are recognized throughout the world as the authority on the proper selection and application of metallic bellows type.
Designing with expansion joints becht engineering company, inc. To become a member of ejma, a company must adhere to strict quality standards in all aspects of expansion joint design, fabrication and testing. Liners are used to protect the bellows element of an expansion joint assembly. If an expansion joint is to be installed underground, or will be submerged in water, contact the manufacturer for speci. An evaluation of ejma stress calculations for unreinforced. However, it is useful as a generic title for expansion joints which are nonmetallic, and used in ducts at low pressures. Apr 05, 2021 the tenth edition standards combine the knowledge and experience of the leading manufacturers of expansion joints into an invaluable reference document. The expansion joint manufacturers association is an organization of established manufacturers of metal bellows type expansion joints. The standardization for certain types of expansion joints is also conditional for. 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.
We can either adapt the expansion joints in this catalogue to comply with these design codes and. The term fabric expansion joint is a little misleading, in that it covers a wider range of products and materials than just fabrics. Asiapacific canada europe middle east south america. 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. The guide is intended to provide users with a basic understanding of expansion joints. These standards combine the knowledge and experience of the associations technical committee and. Ejma which types of expansion joints have this problem. A double expansion joint consists of two bellows joined by a common connector which is anchored to some rigid part of the installation by means of an anchor base. Expansion joints should not be located at any point in a piping system that would impose torque to the expansion joint as a. Triad bellows series1 expansion joints are manufactured with multiple layers of heavier gauge t321 ss material to achieve higher pressure ratings. Jul 14, 2019 the wtandards resistance factor or working spring rate is shown in lbs per inch of lateral offset.
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. 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. Designing with expansion joints 23 pressure balanced expansion joint ejma ejma becht engineering company, inc. Fabric expansion joints are used primarily to contain gaseous fluids. The results are badgers fabric and metal expansion joints installed worldwide in power. Apr 05, 2021 a practical and cost effective means of achieving flexibility in a piping design is through the application of expansion joints. Also, as an active member of the expansion joint manufacturers association, keb. Jun 26, 2020 the expansion joint manufacturers association is an organization of established manufacturers of metal bellows type expansion joints. Updated edition of the manual of expansion joint technology according to the. Apr 05, 2021 ejma is the expansion joint manufacturers association. Bellows expansion joints, the subject of this thesis, are being increasingly used to. Bellows design analysis is performed in accordance with various design codes including. Rigid laboratory and field tests of garlock expansion joints are what back up our assurances of long life and reliable service. Department of mathematics, university of texas at austin.
The ejma standards are used worldwide as a reference for the proper selection and application of metallic bellows expansion joints. Includes one copy of practical guide to expansion joints. Each expansion joint produced by witzenmann can be designed and. Garlock nonmetallic expansion joints and flexible cou. You can also find technical information as a pdf download at. The latter provides a significantly higher cycle life. Metal expansion joints and connectors, rubber expansion joints, te. It was founded in 1955 to create and maintain a set of standards for quality expansion joint design and manufacturing.
Throughout the 20th century and into the 21st, badger engineered expansion joint products have been approved by leading engineering and end user companies. The other is in accordance with the standards of the expansion joint manufacturers association. Twisting about the longitudinal axis of the expansion joint can reduce bellows life or cause expansion joint failure and should be avoided. These standards combine the knowledge and experience of the associations technical committee and are available to. Apr 05, 2021 expansion joints that are installed within ten pipe diameters downstream of elbows, tees, valves or cyclonic devices should be considered to be subject to flow turbulence. The tenth edition standards combine the knowledge and experience of the leading manufacturers of expansion joints into an invaluable reference document. For lower pressure applications a series2 expansion joint will provide increased movement capability. Modelling flexible bellows by standard beam finite elements diva. Ejma carries out extensive technical research and testing on many euma aspects of expansion joint design and manufacturing. The ejma bellows fatigue curve is a best fit curve based on. Bellows were required to be designed in accordance with the rules for pressure design of unlisted components par. We would be pleased to provide you with designs of other. Expansion joint manufacturers association wikipedia. In order for the expansion joint to provide the expected service, the pipe line must have the recommended num.
The results are badgers fabric and metal expansion joints. Typical narrow arch expansion joint movementspring. Then the marginal pdf s or pmfs probability mass functions, if you prefer this terminology for discrete random variables are defined by fyy py y and fxx px x. Expansion joints provide an excellent solution for isolation of settlement, seismic deflection, mechanical vibration and sound attenuation transmission produced by a range of equipment. Standards of the expansion joint manufacturers association, inc. Analysis and design of multiply metallic bellows by do ubido core. Ejma standards pdf documents similar to ejma 9th standards of expansion joint manufacturers association 9h. Ejma was founded in to establish and maintain quality design and manufacturing standards. Its not always a cheap accessory so be sure a liner is needed before specifying one. The expansion joint manufacturers association is an organization of a metal bellows expansion joint manufacturers. Ejma standards pdf free 102 on escape the fate mexico street.
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. 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. 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. American boa is a member of the expansion joint manufacturers association ejma and manufacturers expansion joints in accordance with the latest ejma addendum. Every expansion joint produced by senior flexonics pathway is designed and manufactured in strict accordance with ejma standards. Ihs markit is your source for ejma standards and publications. Ejma the expansion joint manufacturers association, inc. Prior to 1988, coverage of metallic bellows expansion joints in asme b31. Jul 26, 20 bellows vendors will often quote two different cycle lives for their bellows. The tenth edition standards combine the knowledge and experience of the leading manufacturers of expansion joints into an invaluable. First consider the case when x and y are both discrete. 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. The expansion joint manufacturers association, inc.
Ejma standards in the design of singleply and multiply bellows of various shapes and. The wtandards resistance factor or working spring rate is shown in lbs per inch of lateral offset. Designing with expansion joints 24 bellows expansion joint types yes small yes pressure balanced gimbal yes hinged yes yes yes. In addition to the ejma standards, they will also design in. Ejs designs every expansion joint in compliance with ejma standards.
This catalog outlines the selection and installation of our metal bellows. The set of articulations of the two bellows must be designed to support the pressure force hinged. Because of this constant drive to improve, there is a wide selection of systems, materials and performance capabilities from which an owner or engineer may select. The actual flow velocity should be multiplied by 4 to determine if a liner is required per the above guidelines. Crete siliconeseal system is a high performance expansion joint system utilizing a dynamic twopart sealant between impact absorbing elastomeric concrete headers. Metal expansion joints installation instructions pdf. Fmh expansion joints design of bellowsdesign of bellows. The first invention, a metal hose which was developed and patented in 1885, was followed by a patent for the metal expansion joint in 1920. Expansion control systems for additional information about watson bowman acme products, please. 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. Ejma standard of the expansion joint manufacturers association.
1732 1127 1455 212 982 400 701 356 1289 860 68 137 1599 540 924 1623 142 572 432 292 1791 921 1573 1045 709 1045 1637 1431 1711 1309 146 396 950 1301 1352