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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Lateral Working Spring Emma In case of external pressure the reinforcing effect of a possible external collar is excluded. 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 tangent circumferential membrane stress due to internal pressure.

Allowable material stress at design temperature, unless otherwise specified, from the applicable code. Axial Working Spring Rate: This includes standard conversions in addition to constants used in calculations.

This rating may be different for each size, type and make of Expansion Joint and is established by the manufacturer. 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. 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.


This is calculated on ejmma full effective cross section of the bellows known as the effective area. Significant Changes in the Tenth Edition: It is characterized by tilting or warping of one or more convolutions.

EJMA carries out extensive technical standardds and testing on ejjma important aspects of expansion joint design and manufacturing. The Tenth Edition standards combine the frer and experience 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. The fatigue life expectancy of an expansion joint is affected by various factors such as: Bellows convoluted length or live length. Bending Working Spring Rate: 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.

Total Equivalent Max Axial: 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. Bellows circumferential membrane stress due to pressure.

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EJMA 10th Edition

The eima of universal type Expansion Joints has been simplified by a modified equation for the axial movement per convolution. Modulus of Elasticity at design temperature, unless otherwise specified, for material. Bellows material thickness for one ply, corrected for thinning during the forming of the bellows convolutions. Expansion Joints Exhaust Flanges. To order click here.

Factor establishing relationship between the equivalent axial displacement per convolution due to lateral deflection. Definitions in the Nomenclature section 1. Bellows convoluted length Lb plus the length of the bellows tangent ends or necks.

Bellows meridional membrane stress due to pressure.

EJMA 10th Edition

Angular rotation is occasionally referred to as rotational movement and is shown in LBS per degree. Calculated maximum pressure in PSIG before expansion joint may squirm because of column instability. Bellows are rated by the manufacturer in terms of maximum allowable axial displacement per convolution, ec and ee. Axial force or pressure thrust is caused by the internal pressure of the bellows. 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.