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This International Regular specifies the needs for couplings for the transmitting of strength between the revolving shafts of two machines in special-purpose applications in the petroleum, petrochemical and natural gas sectors. Such programs are generally in large and/or higher speed devices, in solutions that can be required to work continuously for prolonged periods, are usually often unspared and are vital to the continued operation of the set up. By agreement, it can be used for additional applications or solutions. Couplings protected by this World Standard are developed to support parallel (or lateral) counteract, angular misalignment ánd axial displacement óf the shafts withóut imposing unacceptable mechanical launching on the coupled devices. It is usually relevant to equipment, metallic flexible element, quill base and torsionally resistant type couplings. Torsional damping and strong kind couplings are usually complete in Annex A new; gear-type couplings are usually detailed in Annex B and quill shaft style couplings are detailed in Annex C. This Essential Standard covers the style, materials of construction, manufacturing high quality, inspection and assessment of special-purposé couplings.

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This Essential Standard will not determine criteria for the selection of coupling types for specific applications. This Essential Standard is usually not relevant to additional varieties of couplings, such as clutch, hydraulic, eddy-current, rigid, radial spline, string and bellows types.