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Expansion Joints Exhaust Flanges. Bellows Yield at Temp: It is used in specific design calculations to relate U-shaped bellows convolution segment behavior to a simple strip beam. Fatigue life calculations were greatly enhanced and simplified.

Total length of the expansion joint including the possible pipe ends. This Guide is not intended as a source for expansion joint design or application details. Total Equivalent Max Axial: The calculation of universal type Expansion Joints has been simplified by a modified equation for the axial movement per fere.

Calculated maximum pressure stndards PSIG before expansion joint may squirm because of inplane instability. The fatigue life expectancy can be defined as the total number of complete cycles which can be expected from the expansion joint. The bellows resistance factor or working spring rate is shown in lbs per inch of lateral offset. Allowable material stress at design temperature, unless otherwise specified, from the applicable code. Zero length is shown for single bellows.

The bellows resistance factor or working spring rate is shown in lbs per inch of compression or extension. Squirm is detrimental to bellows performance in that it can greatly reduce both fatigue life and pressure capacity. Any change in these factors will result in a change in the life of the Expansion Joint. Bellows meridional bending stress due to pressure.

Benchmark table inputs and outputs have been revised, with material class and correction factor. This rating may be different for each size, type and make of Expansion Joint standatds is established by the manufacturer. The distinction of thin versus thick bellows has been added. Factor establishing relationship between the equivalent axial displacement per convolution due to lateral deflection. Joints Externally Pressurized Exp.

The design of every Expansion Joint must be such that the total displacement per convolution from all sources does not exceed the rated values. It is characterized by tilting or warping of one or more convolutions.

## EJMA 10th Edition

Bellows convoluted length or live length. Bellows pitch and height tolerances were redefined relative to diameter.

Cycle Life is theoretical and is dependent upon the maximum stress range to which the bellows is subjected. 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.

This is calculated on the full effective cross section of the bellows known as the effective area. 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. Bellows are rated by the manufacturer in terms of maximum allowable axial displacement per convolution, ec and ee. Bending Working Spring Rate: Distance between outermost ends of the convolutions in a universal expansion joint.

Single Bellows Axial Vibration Constants were revised. 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.

This includes standard conversions in addition to constants used in calculations.

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. This is not torsional rotation.

Angular rotation is occasionally referred to as rotational movement and is shown in LBS per degree. Yield strength at design temperature, unless otherwise djma, of bellows material after completion of bellows forming and any applicable heat treatment. Bellows tangent circumferential membrane stress due to internal pressure.

The fatigue life expectancy of an expansion joint is affected by various factors such as: This condition is predominantly associated with high meridional bending stress at the root and crest of the convolutions. A new E-book version of the new 10th Edition Standards can be downloaded to your PC, laptop or tablet. Axial force or pressure thrust is caused by the internal pressure of the bellows. Column squirm is defined as a gross lateral shift of the centre section of the bellows.

In-plane squirm is defined as a shift or rotation of the plane dtandards one or more convolutions such that the plane of these convolutions is no longer perpendicular to the axis of the bellows.

### EJMA 10th Edition

EJMA was founded in to establish and maintain quality design and manufacturing stanadrds. 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 standarfs.

EJMA 10th Edition is the most current edition and supersedes all previous publications. Axial Working Spring Rate: A new approach was developed for the design of reinforced bellows, standdards in a modified set of equations for some stress components and for the spring rates.

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

Definitions in the Nomenclature section 1.