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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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 ejm.

This is calculated on the full effective cross section of the bellows known as the effective area. Lateral Working Spring Rate: Calculated maximum pressure in PSIG before expansion joint may squirm because of column instability.

It will also assist the user in communicating design requirements to the manufacturers and to properly install and maintain the expansion joint in service.

Bellows are rated by the manufacturer in terms of maximum allowable axial displacement per convolution, ec and ee. The distinction of thin versus thick bellows has been added. The Guide is intended to provide users with a basic understanding of expansion joints.

Yield strength at design temperature, unless otherwise determined, of bellows material after completion of bellows forming and any applicable heat treatment. Cycle Life is theoretical and is dependent upon the maximum stress range to which the bellows is subjected. The bellows resistance factor or working spring rate is shown in lbs per inch of lateral staandards. Zero length is shown for single bellows.


EJMA was founded in to establish and maintain quality design and manufacturing standards. Modulus of Elasticity at design temperature, unless otherwise specified, for material.

Standarxs convoluted length or live length. The Expansion Joint Manufacturers Association is an organization of established manufacturers of metal bellows type expansion joints. Significant Changes in the Tenth Edition: Bellows meridional bending stress due to deflection.

Fatigue life calculations were greatly enhanced and simplified. Benchmark table inputs and feee have been revised, with material class and correction factor. Calculated maximum pressure in PSIG before expansion joint may squirm because of inplane instability. The fatigue life expectancy of an expansion joint is affected by various factors such as: The calculation of universal type Expansion Joints has been simplified by a modified equation for the axial movement per convolution.

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. A new E-book version of the new 10th Edition Standards can be fdee to your PC, laptop or tablet. Total Equivalent Max Axial: Bellows meridional membrane stress due to deflection.

Expansion Joints Exhaust Flanges.

EJMA 10th Edition

This rating may be different for each size, type and make of Expansion Joint and is established by the manufacturer. It is characterized by tilting or warping of one or more convolutions. This is not torsional rotation. In case of external pressure the reinforcing effect of a possible external collar is excluded.

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


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.

Factor establishing relationship between the equivalent axial displacement per convolution due to lateral deflection. Collar circumferential membrane stress due to internal pressure. Bellows tangent circumferential membrane stress due to internal pressure.

EJMA 10th Edition

The Tenth Edition standards combine the knowledge and free of the leading manufacturers of expansion joints into an invaluable reference document. Column squirm is defined as a gross lateral shift of the centre section of the bellows.

Tightness of bellows, bands, frree rings due to dissimilar material growth rates is considered. Single Bellows Axial Vibration Constants were revised. Angular rotation is occasionally referred to as rotational movement and is shown in LBS per degree.

This condition is predominantly associated with high meridional bending stress at the root and crest of the convolutions. Bending Working Spring Rate: Axial force or pressure thrust is caused by the internal pressure of the bellows. Bellows meridional membrane stress due to pressure.