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

## EJMA 10th Edition

Convolution height less the bellows material thickness. A cycle is defined as one complete ejma standard from the initial position in the piping system to the operating position and back to the initial position. Enma new E-book version stanxard the new 10th Ejma standard Standards can be downloaded to your PC, laptop or tablet. To order click here. The Authority on Expansion Joints The EJMA Rjma are recognized throughout the world as the authority on the proper selection and application of metallic bellows type expansion ejka for safe and reliable piping and vessel installation.

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

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. The fatigue life expectancy can be defined as the total number of complete cycles which can be expected from the expansion joint.

Bellows pitch ejma standard height tolerances ejma standard redefined relative to diameter. Pressure thrust can be calculated by multiplying the working pressure by the effective area PSIG ejma standard Ae.

Single Bellows Axial Vibration Constants were revised.

The bellows resistance factor or working spring rate is shown in lbs per inch dtandard compression or extension. This includes standard conversions in addition to constants used in calculations. Significant Changes in the Tenth Edition: The fatigue life expectancy of an expansion joint is affected by various factors such as: The Tenth Edition standards combine the knowledge and experience of the leading manufacturers of expansion joints into an invaluable reference document.

Bellows meridional membrane stress due to pressure. Stansard Guide is intended to provide users with a basic understanding of expansion joints. Bellows meridional bending stress due to deflection. The bellows resistance factor or working spring rate is shown in lbs per ejma standard of lateral offset.

Bellows E at Temperature: Axial force or pressure thrust is caused by the internal pressure of the bellows. This is the displacement of the longitudinal axis of the Expansion Joint from its initial straight line position into a circular ejma standard. Joints Externally Pressurized Ejma standard. This is not torsional rotation. Axial Working Spring Rate: Expansion Joints Exhaust Flanges. Tightness of ejma standard, bands, and rings due to dissimilar material growth rates is considered.

In stanrard to evaluate the loads ejma standard piping, supports, or equipment, it is necessary to determine the axial forces and stanfard required to move an Expansion Joint. Ejma standard is calculated on the full effective cross section of the standdard known as the effective area.

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

### Expansion Joint Manufacturers Association – Wikipedia

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 ejma standard all sources does not exceed the rated values. 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.

EJMA carries out extensive technical research and testing on many ejma standard aspects of expansion joint design and manufacturing. Lateral Working Spring Ejma standard It is calculated as either Lb or Lu plus length of pipe ends.

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

### EJMA 10th Edition

EJMA 10th Edition is the most current edition and supersedes all previous publications. Collar circumferential membrane stress due to internal pressure.

ejma standard

Any change in these factors will result in a change in the life of the Expansion Joint. Factor establishing relationship between the equivalent ejma standard displacement per ejma standard due to lateral deflection. Benchmark table inputs and outputs have been revised, with material class and correction factor.

Fatigue life calculations were greatly enhanced and simplified. Allowable material stress at design temperature, ejma standard otherwise specified, from emma applicable code. Bellows meridional membrane stress due to deflection.

Axial force or thrust caused by the internal pressurization of the bellows. Definitions in the Nomenclature section 1. Ejma standard rotation is occasionally referred to as rotational ejma standard and standadd shown in LBS per degree. This condition is predominantly associated with high meridional bending stress at the root and crest of the convolutions.