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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Single Bellows Axial Vibration Constants were revised. Cycle Life is theoretical and is dependent upon the maximum stress range to which the bellows is subjected. This condition is most stanadrds with bellows which have a relatively large length-to-diameter ration and is similar to the buckling of a column under compressive load.

The distinction of thin versus thick bellows has been added. This is the displacement of the longitudinal axis of the Expansion Joint from its initial straight line position into a circular arc. Zero length is shown for single 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.

This rating may be different for each size, type and make of Expansion Joint and is established by the manufacturer. Angular rotation is occasionally referred to as rotational movement and is shown in LBS per degree. Distance between outermost ends of the convolutions in a universal expansion joint. Bellows pitch and height tolerances were redefined relative to diameter.


Expansion Joints Exhaust Flanges. Bellows meridional bending stress due to pressure. EJMA 10th Edition is the most current edition and supersedes all previous publications. 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.

This is not torsional rotation. This is calculated on the full effective cross section of the bellows known as the effective area.

EJMA 10th Edition

Axial Working Spring Rate: Bellows are rated by the manufacturer in terms of maximum allowable axial displacement per convolution, ec and ee. The design of every Expansion Joint must be such that the total displacement per convolution from all sources does not exceed the rated values.

Bellows tangent circumferential membrane stress due to internal pressure. Allowable material stress at design temperature, unless otherwise specified, from the applicable code. A new E-book version of the new 10th Edition Standards can be downloaded to your PC, laptop or tablet.

The main and most important result was that the calculated bending stress due to deflection could be considerably reduced. The bellows resistance factor or working spring rate is shown in lbs per inch of lateral offset. Excessive internal pressure may cause standarfs bellows to become unstable and squirm. 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 meridional bending stress due to deflection. Yield strength at design temperature, unless otherwise determined, of bellows material after completion of bellows forming and any applicable heat treatment.

Lateral Working Spring Rate: Fatigue life calculations were greatly enhanced and simplified. 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. EJMA was founded in to establish and maintain quality design and manufacturing standards.

In case of external pressure the reinforcing effect of a possible external collar is excluded. 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.

EJMA 10th Edition

Calculated maximum pressure in PSIG before expansion standagds may squirm because of inplane instability. Squirm is detrimental to bellows performance in that it can greatly reduce both fatigue life and pressure capacity. Bellows Yield at Temp: The calculation of universal type Expansion Joints has been simplified by a modified equation for the axial movement per convolution.