EJMA Standards: The Authority on Expansion Joints The EJMA Standards Receive a Free Copy of A Practical Guide To Expansion Joints With each printed . Good Morning friends, I was looking for EJMA 9th Edition Standard. Can someone please provide me this Standard (9th or 8th edition as well)? Petroleum Community Forum -Free Discussion and Education Community. I need EJMA Standard 10th Edition? Can anyone share? Petroleum Community Forum -Free Discussion and Education Community. Help.

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This condition is predominantly associated with high meridional bending stress at the root and crest of the convolutions. This is not torsional rotation. Collar circumferential membrane stress due to internal pressure. Total length of the expansion joint including the possible pipe ends.

Definitions in the Nomenclature section 1. Bellows Yield at Temp: Distance between outermost ends of the convolutions in a universal expansion joint.

This condition is most associated with bellows which have a relatively large length-to-diameter ration and is similar to the buckling of a column under compressive load. In case of external pressure the reinforcing effect of a possible external collar is excluded. Stanadrds of Elasticity at design temperature, wtandards otherwise specified, for material.

The maximum amount of movement axial extension, axial compression, lateral deflection, angular rotation, or any combination thereof which an Expansion Joint is capable of absorbing.

This Guide is not intended as a vree for expansion joint design or application details. The Tenth Edition standards combine the knowledge and experience of the leading manufacturers of expansion joints into an invaluable reference document.

Axial force or pressure thrust is caused by the internal pressure of the bellows. Bellows convoluted length or live length. The fatigue life expectancy of an expansion joint is affected by various factors such as: Any change in these factors will result in xtandards change in the life of the Expansion Joint. This is the displacement of the longitudinal axis of the Expansion Joint from its initial straight line position into a circular arc. EJMA was founded in to establish and maintain quality design and manufacturing standards.


The calculation of universal type Expansion Joints has been simplified by a modified equation for the axial movement per convolution. The Expansion Joint Manufacturers Association is an organization of established manufacturers of metal bellows type expansion joints. ejmw

EJMA 10th Edition

A new E-book version of the new 10th Edition Standards can be downloaded to your PC, laptop or tablet. The Guide is intended to provide users with a basic understanding of expansion joints. Single Bellows Axial Vibration Constants were revised.

Ftee strength at design temperature, unless otherwise determined, of bellows material after completion of bellows forming and any applicable heat treatment. Bellows material thickness for one ply, corrected for standardx during the forming of the bellows convolutions.

The work hardening of austenitic stainless steel, induced during the forming of convolutions, generally ejmma the fatigue life of an Expansion Joint often to a marked degree. Excessive internal pressure may cause a bellows to become unstable and squirm. The distinction of thin versus thick bellows has been added. Bellows meridional membrane stress due to pressure. Calculated maximum pressure in PSIG before expansion joint may squirm because of inplane instability.

Squirm is detrimental to bellows performance in that it can greatly reduce both fatigue life and pressure capacity. Tightness of bellows, bands, and rings due to dissimilar material growth rates is considered.

The design of every Expansion Joint must be such that the total displacement per convolution from all sources does not exceed the rated values. EJMA 10th Edition is the most current edition and supersedes all previous publications.

The bellows resistance factor or working spring rate is shown in lbs per inch of compression or extension. The number of fatigue cycles can now be calculated from the same set of fatigue curves which are relevant for the unreinforced bellows and for the toroidal bellows.


It is used in specific design calculations to relate U-shaped bellows convolution segment behavior to stahdards simple strip beam.

Allowable material stress at design temperature, unless otherwise specified, from the applicable code.

The bellows resistance factor or working spring rate is shown in lbs per inch of lateral offset. It is standxrds as either Lb or Lu plus length of pipe ends.

Benchmark table inputs and outputs have been revised, with material class and correction factor. This is calculated on the full effective cross section of the bellows known as the effective area. The main and most important result was that the calculated bending stress due to deflection could be considerably reduced. Bellows convoluted length Lb plus the length of the bellows tangent ends or necks. A new approach was developed for the design of reinforced bellows, resulting in a modified set of equations for some stress components and for the spring rates.

EJMA 10th Edition

This rating may be different for each size, type and make of Expansion Joint and is established by the manufacturer. Bellows meridional bending emma due to pressure. Axial Working Spring Rate: Factor establishing relationship between the equivalent axial displacement per convolution due to lateral deflection. Bellows meridional membrane stress due to deflection.

Calculated maximum pressure in PSIG before expansion joint may squirm because of column instability. To order click here. Total Equivalent Max Axial: This includes standard conversions in addition to constants used in calculations. EJMA carries out extensive technical research and testing on many important aspects of expansion joint design and manufacturing.