1. Flexible elements may be straight sided, contoured, or convoluted. Acceptable arrangements include a single or element, multiple series elements, or multiple parallel elements (elements packs) at each end of the spacer.
2. The flexible elements shall be positively secured to adjacent parts of the coupling by splines, bolts, or welds. Alternative methods shall be used only when approved by the purchaser.
3. When the flexible elements of a coupling in intermediate-or-high-speed service are combined in a factory-assembled disk pack, the coupling spacer shall be removable without disturbance of the factory assembly of the elements (disks).
4. Unless otherwise specified, the vendor shall treat the coupled equipment as an infinite mass when calculating the ANF. The ANFs of the coupling shall not fall within 10 percent of any of the following speeds or ranges:
a. Any speed within the range extending from the minimum allowable speed to the maximum continuos speed.
b. Tow times any speed within the range specified in item a.
c. Any other speed or exciting frequency specified by the purchaser. (For some applications these restrictions may preclude a practical coupling design. In this case the vendor and the purchaser should investigate and agree upon means of relaxing these criteria).
5 If the coupling must operate within a close-fitting enclosed coupling guard, the purchaser will furnish details of the guard for the vendor to inspect. The vendor shall determine and so advise if cooling is required and, if necessary, shall recommend a cooling system for the coupling.
6 When a tapered hub is specified for one or both ends of the coupling, the vendor shall furnish spacer shims to adjust the spacer gap. The shims shall provide a variance of +1 1/6 inch (1/8 inch total) [+ _ 3.2 millimeters (6.4 millimeters total)] in couplings for shafts with a nominal diameter of less than 4 inches (102 millimeters). In coupling
2. The flexible elements shall be positively secured to adjacent parts of the coupling by splines, bolts, or welds. Alternative methods shall be used only when approved by the purchaser.
3. When the flexible elements of a coupling in intermediate-or-high-speed service are combined in a factory-assembled disk pack, the coupling spacer shall be removable without disturbance of the factory assembly of the elements (disks).
4. Unless otherwise specified, the vendor shall treat the coupled equipment as an infinite mass when calculating the ANF. The ANFs of the coupling shall not fall within 10 percent of any of the following speeds or ranges:
a. Any speed within the range extending from the minimum allowable speed to the maximum continuos speed.
b. Tow times any speed within the range specified in item a.
c. Any other speed or exciting frequency specified by the purchaser. (For some applications these restrictions may preclude a practical coupling design. In this case the vendor and the purchaser should investigate and agree upon means of relaxing these criteria).
5 If the coupling must operate within a close-fitting enclosed coupling guard, the purchaser will furnish details of the guard for the vendor to inspect. The vendor shall determine and so advise if cooling is required and, if necessary, shall recommend a cooling system for the coupling.
6 When a tapered hub is specified for one or both ends of the coupling, the vendor shall furnish spacer shims to adjust the spacer gap. The shims shall provide a variance of +1 1/6 inch (1/8 inch total) [+ _ 3.2 millimeters (6.4 millimeters total)] in couplings for shafts with a nominal diameter of less than 4 inches (102 millimeters). In coupling
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