This Guide is not intended as a source for expansion joint design or application details. Product details Hardcover Publisher: EJMA carries out extensive technical research and testing on many important aspects of expansion joint design and manufacturing. If you are a seller for this product, would you like to suggest updates through seller support? Convolution height less the bellows material thickness. Distance between outermost ends of the convolutions in a universal expansion joint.
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Bellows meridional bending stress due to deflection. 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. English Choose a language for shopping.
The distinction of thin versus thick bellows has stwndards added. Ejma standards Ship Orders Internationally. This is not torsional rotation. EJMA carries out extensive technical research and testing on many important aspects of expansion joint design and manufacturing.
Axial force or pressure thrust is caused by the internal pressure of the bellows.
This is calculated on the full effective cross section of the bellows known as the effective area. Total length of tsandards expansion joint including the possible pipe ends.
Bending Working Spring Rate: The number of fatigue cycles can now be calculated from the same ejmma of fatigue curves ejma standards are relevant for the unreinforced bellows and for the toroidal bellows. 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.
Yield strength at design temperature, stzndards otherwise determined, ejma standards bellows material after completion of bellows forming and any applicable heat treatment. Bellows circumferential membrane stress due to pressure. The calculation of universal type Expansion Joints has been simplified by a modified equation for the axial movement ejma standards convolution.
Bellows tangent circumferential membrane stress due to internal pressure. Definitions in the Nomenclature section 1.
EJMA 10th Edition
Zero length ejma standards shown for single bellows. Allowable material stress at design temperature, unless otherwise specified, from the applicable code. Bellows are rated by the manufacturer in terms of maximum allowable axial displacement per convolution, ec and ee. It is used in specific design ejmw 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.
Bellows pitch and height tolerances were redefined relative to diameter. Syandards cycle is defined as one complete movement from the initial ejma standards in the piping system to the operating position and back to the initial position.
Get to Know Us. The bellows resistance factor or working spring rate is shown in lbs per inch of lateral offset. Fatigue life calculations were greatly enhanced and simplified. Total Equivalent Max Axial: Amazon Renewed Refurbished products with ejma standards warranty.
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Expansion Joint Manufacturers Association
Calculated maximum pressure in PSIG before expansion joint may squirm because of inplane instability. If you are a seller for this product, would you like to suggest updates through seller support?
Stanrards change in these factors will result in a change in the life of ejma standards Expansion Joint.