Ejma 10th Edition Pdf Free Download

[Ashlyn Robello]

EJMAcarries out extensive technical research and testing on many important aspects of expansion joint design and manufacturing. EJMA 10th Edition is the most current edition and supersedes all previous publications.

Cd: The factor read from the EJMA Figure C26 (or ASME VIII) for the listed curve number and x value. It is used in specific design calculations to relate U-shaped bellows convolution segment behavior to a simple strip beam.

Cf: The factor read from the EJMA Figure C25 (or ASME VIII) for the listed curve number and x value. It is used in specific design calculations to relate U-shaped bellows convolution segment behavior to a simple strip beam.

Cp: The factor read from the EJMA Figure C26 (or ASME VIII) for the listed curve number and x value. It is used in specific design calculations to relate U-shaped bellows convolution segment behavior to a simple strip beam.

Rated Max Axial: 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. This rating may be different for each size, type and make of Expansion Joint and is established by the manufacturer.

Total Equivalent Max Axial: 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 from all sources does not exceed the rated values.

Axial Working Spring Rate: 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. The bellows resistance factor or working spring rate is shown in lbs per inch of compression or extension.

Lateral Working Spring Rate: 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. The bellows resistance factor or working spring rate is shown in lbs per inch of lateral offset.

Bending Working Spring Rate: This is the displacement of the longitudinal axis of the Expansion Joint from its initial straight line position into a circular arc. Angular rotation is occasionally referred to as rotational movement and is shown in LBS per degree. This is not torsional rotation.

Limiting Column Instability: Calculated maximum pressure in PSIG before expansion joint may squirm because of column instability.

Excessive internal pressure may cause a bellows to become unstable and squirm. Squirm is detrimental to bellows performance in that it can greatly reduce both fatigue life and pressure capacity.

Column squirm is defined as a gross lateral shift of the centre section of the bellows. 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.

Limiting Inplane Instability: Calculated maximum pressure in PSIG before expansion joint may squirm because of inplane instability.

In-plane squirm is defined as a shift 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. It is characterized by tilting or warping of one or more convolutions. This condition is predominantly associated with high meridional bending stress at the root and crest of the convolutions.

Allowed Cycles: The fatigue life expectancy can be defined as the total number of complete cycles which can be expected from the expansion joint. 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. Cycle Life is theoretical and is dependent upon the maximum stress range to which the bellows is subjected. The fatigue life expectancy of an expansion joint is affected by various factors such as: operating pressure, operating temperature, the material from which the bellows is made, the movement per convolution, the thickness of the bellows, the convolution pitch, the depth and shape of the convolution. Any change in these factors will result in a change in the life of the Expansion Joint. The work hardening of austenitic stainless steel, induced during the forming of convolutions, generally improves the fatigue life of an Expansion Joint often to a marked degree.

Effective Area Ae: 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. Pressure thrust can be calculated by multiplying the working pressure by the effective area (PSIG x Ae).

Thrust Force: Axial force or thrust caused by the internal pressurization of the bellows. The thrust force is calculated by multiplying the working pressure by the effective area (PSIG x Ae).

It was founded in 1955 to establish and maintain design and manufacturing standards. These standards combine the knowledge and experience of the association's Technical Committee and are available to assist users, designers, and others in the selection and application of expansion joints for the safe and reliable installation of pipes and containers.

Since 1958, when the EJMA first published these standards, continuous technological improvements in the application and design of Expansion Joints have been reported through the cooperative efforts of their association members in expanding the scope and content of this standard publication. The first edition of the EJMA standard was, by necessity, somewhat brief and covered only applications involving axial motion. But as the results of extensive research and testing were catalogued, more detailed design data was included in the EJMA standard.

The standards are designed to apply to metal bellows expansion joints having only the convolution shapes shown in the standards and having convolution welds only in the meridional direction with the exception of bellows joint welds.

EJMA standards are recognized throughout the world as the authority on the proper selection and application of metal bellows type expansion joints for the safe and reliable installation of pipes and vessels. The 10th edition standards combine the knowledge and experience of the leading expansion joint manufacturers in one invaluable reference document.

With each printed copy of the tenth edition, EJMA adds an EJMA Practical Guide to Expansion Joints, a pocket guide based on the EJMA standards that is intended to provide users with a basic understanding of expansion joints and help the user to communicate design requirements to manufacturers and to properly install and maintain the expansion joint in service.

Expansion joints / Stainless Steel Bellows in QSK60 Engine:The Expansion Joint is a solution for the safety between the engine and the engine charged air line. It is connected between the engine charge airline through the engine cylinder head outlet to the silencer. We have successfully supplied these types of metal expansion joints to leading engine manufacturers internationally.

The Bellows Expansion Joints has an ability to compensate the vibrationsand the thermal movementsdeveloped in the system thus leading to the smooth working of the engine. Due to this Bellows/compensators installation the life and efficiency of the QSK60 Engine is enhanced considerably.

The Cummins Engine QSK60 Exhaust Bellows Part No: - KTA50, KTA38, 4080141, 3332253, 4080159 and PN3968643 is manufactured at World Class Standards by Pliant Bellows (Kwality products). The Cummins Engine QSK60 Exhaust Bellows are manufactured by Hydro forming process. The assembly is furthercircular seam welded using German seam welding technology.The Engine Exhaust Bellows are designed and validated as per Expansion JointManufacturers Association (10th edition)(EJMA 10th Edition)

EJMA 10th Edition is the most current edition and supersedes all previous publications. Triad Bellows Design and Manufacturing uses bellows design software based on EJMA 10th edition guidelines. Cd: The factor read from the EJMA Figure C26 (or ASME VIII) for the listed curve number and x value. It is used in specific design calculations to relate U-shaped bellows convolution segment behavior to a simple strip beam.

Cf: The factor read from the EJMA Figure C25 (or ASME VIII) for the listed curve number and x value. It is used in specific design calculations to relate U-shaped bellows convolution segment behavior to a simple strip beam. Cp: The factor read from the EJMA Figure C26 (or ASME VIII) for the listed curve number and x value. It is used in specific design calculations to relate U-shaped bellows convolution segment behavior to a simple strip beam. S1: Bellows tangent circumferential membrane stress due to internal pressure.

In case of external pressure the reinforcing effect of a possible external collar is excluded. S1: Collar circumferential membrane stress due to internal pressure. In case of external pressure the reinforcing effect of a possible external collar is excluded. S2: Bellows circumferential membrane stress due to pressure. S3: Bellows meridional membrane stress due to pressure. S4: Bellows meridional bending stress due to pressure.

S5: Bellows meridional membrane stress due to deflection. S6: Bellows meridional bending stress due to deflection. Rated Max Axial: 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. This rating may be different for each size, type and make of Expansion Joint and is established by the manufacturer.

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