ENERPAC - Industrial Tools Page 414
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Torque Tightening Tightening Methods Bolting Integrity Software Principally there are two modes of tightening: "Uncontrolled" and "Controlled". A comprehensive on-line software solution for Bolted Joint integrity. Uncontrolled tightening Controlled tightening Integral databases hold data for: Uses equipment and/or procedures that cannot be measured. Preload is applied to a bolt and nut assembly using a hammer and spanner or other types of impact tools. Employs calibrated and measurable equipment, follows prescribed procedures and is carried out by trained personnel. • ASME B16.5, ASME B16.47, API 6A and API 17D flanged joints • Common gasket materials and configurations • Comprehensive range of bolt materials • Comprehensive range of lubricants Advantages of Controlled Tightening Known, controllable and accurate bolt loads Reduces operational time resulting in increased productivity Employs tooling with controllable outputs and adopts calculation to determine the required tool settings. Reduces tightening time and operator fatigue by replacing manual effort with the use of controlled tooling. Uniformity of bolt loading Reliable and repeatable results Especially important on gasketed joints as an even and consistent compression is required for the gasket to be effective. Using calibrated, tested equipment, following procedures and employing skilled operators achieves known results consistently. Safe operation following prescribed procedures The right results first time Eliminates the dangerous activities of manual uncontrolled tightening and requires that the operators be skilled and follow procedures. • Enerpac's Controlled Bolting Equipment including: Torque Multipliers, Hydraulic Wrenches and Bolt Tensioning tools Custom Joint information can also be entered. The software offers Tool selection, Bolt Load calculations and Tool pressure settings, as well as, a combined Application data sheet and Joint completion report. Many of the uncertainties surrounding in-service joint failures are removed by ensuring the correct assembly and tightening of the joint are carried out the first time. www.enerpac.com Torque Tightening What is Torque? It is a measure of how much force acting on an object which causes that object to rotate. What is Torque Tightening? The application of preload to a fastener by the turning of the fastener’s nut. 412 Torque Tightening and Preload Turning movement The amount of preload created when torquing is largely dependant on the effects of friction. Force Principally there are three different “torque components”: • torque to stretch the bolt • torque to overcome the friction in bolt and nut threads • torque to overcome friction at the nut spot face (bearing contact surface). Stretch of Fastener (Pre-load) www.enerpac.com
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