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TORQUE & TENSIONING


EvoTorque2 fitted with the new right-angled gearbox


FEATURE SPONSOR


TOTAL TORQUE CONTROL AND TRACEABILITY


Torqueing is fundamentally the measured application of rotational force to a threaded fastener


When the torque is under or over the manufacturer’s specification, it can cause considerable damage to the turbine structure. One key technical implication of over or under torque is the potential for vibrations in the turbine… which presents a real risk of catastrophic failure.


Furthermore, when triggering electric multipliers on pre-tightened bolts, a dangerous over-torque can occur due to the slow response time of controllers, high motor start currents and high motor inertias. In some instances, this over- torque can be in the region of 100 percent.


88 www.windenergynetwork.co.uk SOLUTION


A tool that can tighten bolts accurately to the required torque, audit pre- tightened bolts and then record this data, does exist. Norbar’s EvoTorque 2, enables users to torque bolts accurately and reliably and generates a record to confirm the fact, providing complete traceability for operations & maintenance teams and their clients.


In response to customer feedback the company has introduced EvoTorque2, which adds data memory and transfer capabilities and audit mode to the features of the original EvoTorque tool. It is capable of incredible control in tough conditions – where bolts have not previously been tightened it will deliver torque values with an accuracy of ±3 percent. Where torque is re-applied to a pre-tightened bolt results are within ±5 percent of set torque.


TESTING In a retightening test, the EvoTorque2 demonstrated a clear advantage whereby, when triggered 18 consecutive times on an already tightened bolt, it achieved total accumulated over-torque of around 15 - 20 percent of the set torque; depending on the hardness of the joint. So many consecutive applications using traditional electric tools would likely result in tool or bolt failure. This tool makes the need for final torqueing with a hydraulic wrench unnecessary.


The output of most electric motors reduces as the motor temperature increases with use, resulting in less accurate torque values. The accuracy will not change as a result of ambient temperature or motor temperature, thus enabling numerous joints to be tightened consecutively with trusted results assured.


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