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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Bellows convoluted length or live length.

EJMA 10th Edition

Angular rotation is occasionally referred to as rotational movement and is shown in LBS per degree. EJMA was founded in to establish and maintain quality design and manufacturing standards.

Bellows meridional membrane stress due to pressure. The Guide is intended to provide users with a basic understanding of expansion joints. Calculated maximum pressure in PSIG before expansion joint may squirm because of inplane instability. Bellows tangent circumferential membrane stress due to internal pressure. Axial force or pressure thrust is caused by the internal pressure of the bellows. The bellows resistance factor or working spring rate is shown in lbs per inch of compression or extension.

Bellows meridional membrane stress due to deflection. The fatigue life expectancy can be defined as the total number of complete cycles which can be expected from the expansion joint. This condition is predominantly associated with high meridional bending stress eima the root and crest of the convolutions.


Bellows circumferential membrane stress due to pressure. Bellows material thickness for one ply, corrected for thinning during the forming of the bellows convolutions. Excessive internal pressure may cause a bellows to become unstable and squirm.

It is calculated as either Lb or Lu plus length of pipe ends. Squirm is detrimental to bellows performance in that it can greatly reduce both fatigue life and pressure capacity. The main and most important result was that the calculated bending stress due to deflection could be considerably reduced. In order to evaluate the loads upon piping, supports, or equipment, it is necessary to determine the lateral forces and moments required to move an Expansion Joint. Bellows Yield at Temp: Axial force or thrust caused by the internal pressurization of the bellows.


Collar circumferential membrane stress due to internal pressure. The fatigue life expectancy of an expansion joint is affected by various factors such as: Zero length is shown for single bellows. The calculation of universal type Expansion Joints has been simplified by a modified equation for the axial movement per convolution.

A cycle is defined as one complete movement from the initial position in the piping system to the operating position and back to the initial position. Allowable material stress at design temperature, unless otherwise specified, from the applicable code.

EJMA carries out extensive technical research and testing on many important aspects of expansion joint design and manufacturing. 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. Single Bellows Axial Vibration Constants were revised. Modulus of Elasticity at design temperature, unless otherwise specified, for material.

Expansion Joints Exhaust Ejja. The Tenth Edition standards combine the knowledge and experience of the leading feee of expansion joints into an invaluable reference document. Any change in these factors will result in a change in the life of the Expansion Joint. The distinction of thin versus thick bellows has been added.

EJMA 10th Edition is the most current edition and supersedes all previous publications. This includes standard conversions in addition to constants used in calculations. Cycle Life is theoretical and is dependent upon the maximum stress range to which the bellows is subjected.

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 is not torsional rotation. Convolution height less the bellows material thickness. Bellows E at Temperature: Column squirm is defined as a gross lateral shift sgandards the centre section of the bellows. 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.

In case of external pressure the reinforcing effect of a possible external collar is excluded. Bellows convoluted length Lb plus the length of the bellows tangent ends or necks. Definitions in the Nomenclature section 1. stanxards

To order click here. Tightness of bellows, bands, and rings due to dissimilar material growth rates is considered. Lateral Working Spring Rate: Factor establishing relationship between the equivalent axial displacement per convolution due to lateral deflection.

The Expansion Joint Manufacturers Association is an organization of established manufacturers of metal bellows type expansion joints. In-plane squirm is defined as a shift or rotation of the plane of one or more convolutions such that the plane of these convolutions is no longer perpendicular to the axis of the bellows. The bellows resistance factor or working spring rate is shown in stndards per inch of lateral offset.

Yield strength at design temperature, unless otherwise determined, of bellows material after completion of bellows forming and any applicable heat treatment. Benchmark table inputs and outputs have been revised, with material standagds and correction factor. Pressure thrust can be calculated by multiplying the working pressure by the effective area PSIG x Ae.