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Various coupling types are used for reciprocating compressor installations like rubber-in-shear (highly-flexible couplings), rubber-in-compression, metal-disc, diaphragm and rigid flange couplings. They all have their individual advantages - otherwise they would not exist - however, experience shows that some types bear much higher risks in terms of drive train vibration problems than others. The presentation compares common coupling types on the basis of many years of experience. It evaluates different aspects but has a special focus on torsional vibration issues like frequency placement of natural frequencies, reliability of stiffness values and load capacity. A thorough analysis of the experiences gained by NEA shows that there is indeed a quality unbalance when focusing the most important criteria. These criteria have to be defined and the different coupling types have to be evaluated accordingly. The main focus, when ranking the criteria, is put on the reliability in operation where experience shows that this is usually considered to be the most important aspect. The reliability in operation is closely linked to the actual dynamic torque load in operation which strongly depends on the coupling torsional stiffness characteristics and also on the coupling dynamic torque load capacity. The presentation will give an overview about the appropriate coupling choice in terms of compressor train reliability. For electrical motor driven reciprocating compressor trains, it is essential to incorporate the electro-magnetic motor dynamics in torsional vibration simulations. Without doing it, the results concerning natural frequencies and torque amplification at resonant conditions might be completely wrong and can finally lead to an equipment failure. In addition, the motor behaviour can result in a negative damping which can amplify the torques even with very low excitations. This special risk only exists for all-steel type coupling since their typical stiffness results in
Your Price $195.00
List Price $195.00