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The advantage of the Torquemeter System besides its high accuracy (within 1% full scale at temperatures below 250(?F) and adaptability is its suitability for high and low speeds. (The use of the Heat Balance Test, normally used in defining power produced by the machinery with an accuracy of 5%, when used in conjunction with the Indikon Torquemeter System will allow you to define the optimum operating range in machinery under any plant operating condition.) The ?On Shaft? electronics is capable of measuring the output of position sensors while the machinery is operating, to define alignment in the world?s only ?hot alignment? system. There are many methods (i.e. lasers, dial gages, etc.) for measuring alignment when the machinery is stationary. Since alignment changes as the machinery warms up and/or as loading changes, most methods cannot monitor alignment reliably once the machinery has been set in motion. When we discuss ?hot alignment?, we are actually describing the capability of supplying a ?misalignment? indication while the shaft is rotating and operating. (Static measurements are only repeatable when the equipment is in a static condition but misalignment usually becomes evident after the machinery is in motion) The Indikon?s ?Hot Alignment? displays the X and Y angular and parallel coordinates in ?mil/ inch? and in ?mils? (.001") required for realigning the shaft and coupling as well as the axial gaps. The ?Hot Alignment System? works through the use of eddy-current proximity probes which measure the amplitudes of the once-per-revolution variations in gap due to misalignment between coupling spacers and its hubs. Since the probes rotate with the coupling, they always view the same area of the target so surface roughness and/or machining variations do not affect probe reading performance. Furthermore, the use of a marker probe sets the reference for the misalignment vector and enables the electronics to calculate and display its X & Y components. Since misalignment is measured at running speed, it helps to define the existing shaft thermal expansions and/or machine casing expansions that may affect alignment measurements. Example and Payback - An 8MW Gas Turbine, which drives a compressor at a gas plant, runs an average of 6,400 hours annually and consumes around $1.2 million worth of energy. After installing an Indikon Torquemeter-Hot Alignment System, a shaft misalignment of 2 mils/inch (angular) was identified and corrected thereby saving the coupling, reducing the frictional losses and increasing overall efficiency by about 1.5% due to decreases in downtime and servicing. In addition, careful observation of the optimum operating rpm range and horsepower readings allowed the plant personnel to operate the machine at 16,500 rpm instead of the previous operating speed of 18,000 rpm resulting in a saving of 2.5% in efficiency. The payback of the Indikon system, in this particular case, would be achieved in less than 18 months of operation and could probably be even shorter for larger rotating machinery. Shaft Data Forms - To obtain a quote and layout drawings that will reflect your specific application and coupling information, please submit the forms and/or download them and send them via e-mail back to us. |
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Torquemeter Accuracy - (Standard) 1.0% of Full Scale (FS) rating Under certain conditions - (Special) 0.5% of Full Scale (FS) rating Hot Alignment Accuracy - 5% of reading +/- .5 mils/inch Torquemeter Useful Range - 25% to 125% of Full Scale Hot Alignment Range - +/- 20 mils/inch (1.15 degrees) Torquemeter Calibration - All units are calibrated at the full scale specified by customer (limit 100,000 ft-lb) Hot Alignment Calibration - 5 mils/inch (approx .3 degrees) Torquemeter Calibration Accuracy - 0.25% of Full Scale Standard Data - 5 points up and down (0, 1/4, 1/2, 3/4, FS) for linearity and hysterisis Torquemeter and Hot Alignment Readout Instrument - 3.5-4.5 digit display for each output The following outputs are available from the readout instrumentation - Torquemeter Output - Three - Speed / Torque / Horsepower - 4-20mA or 0-10 VDC | ||
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Digital Torquemeter and
