Ejma standards free

The bellows resistance factor or working spring rate is shown in lbs per inch of compression or extension. Angular rotation is occasionally referred to as rotational movement and is shown in LBS per degree. Factor establishing relationship between the equivalent axial displacement per convolution due to lateral deflection. Bellows meridional membrane stress due to pressure. 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.

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Squirm is detrimental to bellows performance in that it can greatly reduce both fatigue life and pressure capacity. In order to evaluate the loads upon piping, supports, or equipment, it is necessary to stndards the axial forces and moments required to move an Expansion Joint.

Total Equivalent Max Axial: The fatigue life expectancy of an expansion joint is affected by various factors such as: Joints Externally Pressurized Exp. Modulus of Elasticity at design temperature, unless otherwise specified, for material. Column squirm ejja defined as a gross lateral shift of the centre section of the bellows.

It is used in specific design calculations to relate U-shaped bellows convolution segment behavior to a simple strip beam.

EJMA 10th Edition is the most current edition and supersedes all previous publications.

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.

This condition is predominantly associated with high meridional bending stress at the root and crest of the convolutions. This is not torsional rotation. This is calculated on the full effective cross section of the bellows known as the effective area. fere

Bellows E at Temperature: The bellows resistance factor or working spring rate is shown in lbs per inch of compression or extension. Axial force or thrust caused by the internal pressurization of the bellows. Bellows circumferential membrane stress due to pressure.

Calculated maximum pressure in PSIG before expansion joint may squirm because of inplane instability. Axial force or pressure thrust is caused by the internal pressure of the fre. 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.

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. EJMA carries out extensive technical research and testing on many important aspects of expansion joint design and manufacturing.

Yield strength ejm design temperature, unless otherwise determined, of bellows material after completion of bellows forming and any applicable heat treatment.

EJMA 10th Edition

Factor establishing relationship between the equivalent axial displacement per convolution due to lateral deflection. Pressure thrust can be calculated by multiplying the working pressure by the effective area PSIG x Ae. A cycle is defined as one complete movement from the initial position in the piping system to the operating position and back to the syandards position. Collar circumferential membrane stress due to internal pressure.

Bellows convoluted length or rree length. The work hardening of ejms stainless steel, induced during the forming of convolutions, generally improves the fatigue life of an Expansion Joint often to a marked degree.

This rating may be different for each size, type and make of Expansion Joint and is established by the manufacturer. The bellows resistance factor or working spring rate is shown in lbs per inch of lateral offset.

Bellows tangent circumferential membrane stress due to internal pressure. Any change in these factors will result in a change in the life of the Expansion Joint.

EJMA 10th Edition

Bellows convoluted length Lb plus the length of sgandards bellows tangent ends or necks. 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.

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