Standard edition was, of necessity, somewhat brief and covered only The EJMA TM Standards are intended for application to metallic bellows expansion joints. The Expansion Joint Manufacturers Association is an organization of a metal bellows expansion joint manufacturers. It was founded in to create and maintain a set of standards for quality expansion joint design and manufacturing. The EJMA standards are used worldwide as a reference for the proper. EJMA BOOK OF STANDARDS: Standards of the Expansion Joint Manufacturers Association, Inc. – Includes one copy of Practical Guide to Expansion Joints.

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Perhaps there was confusion over which code was applicable. Expansion Joints Exhaust Flanges.

Subscribe to our newsletters or Click Link to View Archives. Ejma uses Sym yield strength at room from cert not tensile.

EJMA 10th Edition

Available Positions Apply On-line. Fitness for Service 9 post s. Guest – Alexander on Monday, 25 August It will also assist the user in communicating design requirements to the manufacturers and to properly install and maintain the expansion joint in service. Sa is the allowable stress from the applicable code. EJMA was founded in to establish and maintain quality design and manufacturing standards.


Historically, designers have put large factors of safety stsndard the number of design cycles for bellows, which was in part justified since there was no design margin in the EJMA fatigue curve. In order to evaluate the loads upon piping, supports, or equipment, it is necessary to determine the axial forces and moments required to move an Expansion Joint.

This Guide is not intended as a source for expansion joint design or application details. Total Equivalent Max Axial: This condition is most associated with bellows which have a relatively large length-to-diameter ration and is similar to the eima of sttandard column under compressive load. The fatigue life expectancy can be defined as the total number of complete cycles which can be expected from the expansion joint.

Safety 10 post s. He is an ASME Fellow and has more than 60 publications and five patents and is a frequent speaker and chairman in technical forums.

Due Diligence 5 post s. This would be a very good development as it will lead to more uniform design practices and less confusion.

Tightness of bellows, bands, and rings due to dissimilar material growth rates is considered. Bellows Standqrd at Temperature: Litigation Support 3 post s. General Interest 4 post s.

Axial force or thrust caused by the internal pressurization of the bellows. Subscribe to this blog post Please fill in your email address to subscribe to updates from this post.


Materials Degradation and Corrosion 15 post s. Allowable material stress at design temperature, unless otherwise specified, from the applicable code.

Expansion Joint Manufacturers Association

The Tenth Edition standards combine the knowledge and experience of the leading manufacturers of expansion joints into an invaluable reference document. Bellows meridional membrane stress due to pressure. Angular rotation is occasionally referred to as rotational movement and is shown in LBS per degree.

It is calculated as either Lb or Lu plus length of pipe ends. Bellows convoluted length or live length. Response to Stress Question.

EJMA 10th Edition

Heavy Lift 13 post s. This is the displacement of the longitudinal axis of the Expansion Joint from its initial straight line position into a circular arc. The number of fatigue cycles can now be calculated from the same set syandard fatigue curves which are relevant for the unreinforced bellows and for the toroidal bellows.

The work hardening of austenitic stainless steel, induced during the forming of convolutions, generally improves the fatigue life of an Expansion Joint often to a marked degree.

Was he fudging the first time?