ENERPAC - Bolting Tools Pagina 79
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Hydraulic Nuts A Simple and Effective Method of Tensioning Large Bolts in Difficult to Access Areas Enerpac Hydraulic Nut Applications Have Included: The Hydraulic Nut is a permanent fixture, replacing the conventional nut and retaining the high bolt load and extension in small space envelopes where there may not be sufficient space to use tensioners. • • • • • • • • ▲ Tensioning with hydraulic nuts. HYDRAULIC NUTS Enerpac hydraulic nuts are used in many process-critical bolting applications where the ease of installation and manpower time savings are substantial and ongoing. Moreover, they eliminate many of the uncertainties of torque arising from friction, point loading and load scatter. Enerpac Hydraulic Nuts are a simple and effective method of tensioning large bolts in difficult to access areas with insufficient space for standard tensioners. Typically used when installing and maintaining bolting systems, hydraulic nuts can replace both conventional hexagon nuts and standard round nuts providing a high and predictable degree of tensioning accuracy. Threaded directly onto the stud, Enerpac hydraulic nuts apply a direct axial elongation by means of hydraulic force generated via the nut’s integral hydraulic cylinder. The nut is held in place either by means of a top or bottom load retaining collar externally located on the nut or by the insertion of mechanical shims. Enerpac hydraulic nuts can be retrofitted to existing plant providing an accurate solution to mechanical jointing problems. • • • • Flange Clamps: Pipeline, Structural Turbines: Gas, Wind, Steam Pressure & Reactor Vessels Diesel Engines Nuclear Applications: Steam Generators Hydraulic and Mechanical Presses Heat Exchangers Pipeline Flanges, Valves and Control Systems Valves & Pumps Cranes – Slew Ring Bolts, Tower Cranes Shaft Couplings Mining: Grinders, Cutters, Earth Moving Equipment Benefits of Enerpac Hydraulic Nuts • Highly accurate and repeatable bolt loads • Ideal where space limitations prevent use of standard detachable tensioners • Direct Axial Loading - No nut rotation required • Multiple nuts can be connected and tightened / loosened simultaneously • Eliminates issues with friction • Substantial time savings due to the quick set-up and hydraulic nuts remaining in-situ • No stud or flange damage (Galling, Seizure) • No need to change joint hardware – system works with existing studs • Ideal when the tension in bolts needs to be checked regularly such as vibration loosening. ▲ Hydraulic nuts on a diesel engine. 77
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