EJMA STANDARDS FREE PDF
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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Distance between outermost ends of the convolutions in a universal expansion joint. This is calculated on the full effective cross section of the bellows known as the effective area. Calculated maximum standatds in PSIG before expansion joint may squirm because of column instability. The main and most important result was that the calculated bending stress due to deflection could be considerably reduced.
In-plane squirm is defined as a rree 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. The bellows resistance factor or working spring rate is shown in lbs per inch of compression or extension. Bellows meridional membrane stress due to deflection.
This is the displacement of the longitudinal axis of the Expansion Joint from its initial straight line position into a circular arc.
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 convoluted length or live length. Cycle Life is theoretical and is dependent upon the maximum stress range to which the bellows is subjected. 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.
It is calculated as either Lb or Lu plus length of pipe ends.
EJMA 10th Edition
In order to evaluate the loads upon piping, supports, or equipment, it is necessary to determine the standarxs forces and moments required to move an Expansion Joint. Stanvards fatigue life expectancy of an expansion joint is affected by various factors such as: It is used in specific design calculations to relate U-shaped bellows convolution segment behavior to a simple strip beam.
Bellows meridional membrane stress due to pressure. Collar circumferential membrane stress due to internal pressure. Definitions in the Nomenclature section 1. The Expansion Joint Manufacturers Association is an organization of established manufacturers of metal bellows type expansion joints.
This rating may be different for each size, type and make of Expansion Joint and is established by the manufacturer. Modulus of Elasticity at design temperature, unless otherwise specified, for material. Bellows circumferential membrane stress due to pressure. Tightness of bellows, bands, and rings due to dissimilar material growth rates is considered. The Authority on Expansion Joints The EJMA Standards are recognized throughout the standares as the authority on the proper selection and application of metallic bellows type expansion joints for safe and reliable piping and vessel installation.
Allowable material stress at design temperature, unless otherwise specified, from the applicable code.
Axial force or thrust standrds by the internal pressurization of the bellows. Bellows meridional bending stress due to pressure. It will also assist the user in communicating design requirements to the manufacturers and to properly install and maintain the expansion joint in service.
EJMA 10th Edition
The bellows resistance factor or working spring rate is shown in lbs per inch of lateral offset. In case of external pressure the reinforcing effect of a possible external collar is excluded.
Bellows meridional bending stress due to deflection. This includes standard conversions in addition to constants used in calculations. Total Equivalent Max Axial: Bellows convoluted length Lb plus the length of the bellows tangent ends or necks. Axial force or pressure thrust is caused by the internal pressure of the bellows.