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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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. Fatigue life calculations were greatly enhanced and simplified.

EJMA 10th Edition

Axial Working Spring Rate: Bellows meridional bending stress due to deflection. Allowable material stress at design temperature, unless otherwise specified, from the applicable code. This is calculated on the full effective cross section of the bellows known as the effective area. It is characterized by tilting or warping of one or more convolutions. This condition is predominantly associated with high meridional bending stress at the root and crest of the convolutions.

EJMA 10th Edition

Axial force or pressure thrust is caused by the internal pressure of the bellows. This is not torsional rotation.

Collar circumferential membrane stress due to internal pressure. The distinction of thin staandards thick bellows has been added. Pressure thrust can be calculated by multiplying the working pressure by the effective area PSIG x Ae. The Guide is intended to provide users with a basic understanding of expansion joints.


Bellows tangent circumferential membrane stress due to internal pressure.

Total Equivalent Max Axial: Expansion Joints Exhaust Flanges. Significant Changes standrds the Tenth Edition: Total length of the expansion joint including the possible pipe ends.

The fatigue life expectancy of an expansion joint is affected by various factors such as: Convolution height less the bellows material thickness. Bellows meridional membrane stress due to deflection.

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.

In case of external pressure the reinforcing effect of a possible external collar is excluded. EJMA 10th Edition is the most current edition and supersedes all previous publications. Cycle Life is theoretical and is dependent upon the maximum stress range to which the bellows is subjected. Bellows meridional membrane stress due to pressure.

In order to evaluate the loads upon piping, supports, or equipment, it is necessary emja determine the lateral forces and moments required to move an Expansion Joint. Bellows circumferential membrane stress due to pressure. 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.

Bellows pitch and height tolerances were redefined relative to diameter. This is the displacement of the longitudinal axis of the Expansion Joint from its initial straight line position into a circular arc.

This condition is most associated with bellows which have a relatively large length-to-diameter djma and is similar to the buckling of a column under compressive load. Bellows meridional bending stress due to pressure.


Axial force or thrust caused by the internal pressurization of the bellows. Bellows E at Temperature: Joints Externally Pressurized Exp. Lateral Working Spring Rate: 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.

Distance between outermost ends of the convolutions in a universal expansion joint. Standdards squirm is defined as a gross lateral shift of the centre section of the bellows.

EJMA carries out extensive technical research and testing fjma many important aspects of expansion joint design and manufacturing. EJMA was founded in to establish and maintain quality design and manufacturing standards.

The fatigue life expectancy can be defined as the total number of complete cycles which can be expected from the expansion joint. Factor establishing relationship between the equivalent axial displacement per convolution due to lateral deflection.

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. Squirm is detrimental to bellows performance in that it can greatly reduce both fatigue life and pressure capacity.

Bellows material thickness for one ply, corrected for thinning during the forming of the bellows convolutions.