Measuring bolt elongation before using torque wrenches or bolt tensioners

July 31, 2020by absadmin0


TensionPro Sonar

Major industrial application face constant vibrations and loads which loosens the bolt. As torque wrenches and bolt tensioners are frequently used during maintenance to achieve joint integrity, it is known to be a time-consuming and tedious process. In this article, we aim to offer a time saving solution by explaining how using a ultrasonic bolt load measurement device like the TensionPro Sonar can help during such operations.

What does the TensionPro Sonar measure?

The TensionPro Sonar measures the bolt elongation ultrasonically recording the change of the bolt length (that is before tightening and after tightening). The ultrasonic device records the bolt load by measuring the bolt elongation. The load applied on the bolt allows it to stretch or elongate. When the elastic limit is more than the applied load, the bolt load is proportional to the elongation. The bolt load can then be calculated from the elongation if the physical properties of the bolt are known.

What is Bolt Elongation?

The change in readings taken before and after tightening a bolt is the bolt elongation. To further simplify, if the reading before tightening states 135mm and after tightening states 136.4mm, it means the bolt was stretched 1.4mm.

The benefits of implementing in bolting operations

There are multiple benefits in determining the bolt elongation before initiating any bolting process. The inclusion saves time, enhances productivity, and efficiency on-site. Time saving is crucial for plants considering the significant amount of losses they incur due to shutdowns and maintenance. To mitigate such issues, many plants implement modern technologies to minimize the time in completing bolting jobs.

Measuring the bolt elongation, the TensionPro Sonar determines which bolt needs tightening and which does not; allowing the operator to save time on carrying and setting up the tool every time. Since the number of bolt operation is less, it reduces the number of manpower required to complete the work which helps save on manpower costs. The TensionPro’s data recording feature allows the operator to record, store, and monitor the elongation of every bolt and then take a call whether to bolt or not.

To simplify the above, an oil and gas plant uses a TensionPro Sonar in its bolting operations. The first shutdown would be the same as before i.e. tensioning or torquing all bolts with torque wrenches and bolt tensioners. Note that the first maintenance with the TensionPro Sonar will be conducted like before to record and store data in the ultrasonic device. This data will be used in the next shutdown or during preventive maintenance to monitor the bolt elongation and determine if there is any loss in the bolt. The data collected will determine if the elongation is under the accepted tolerance limit and if tightening is required. As tools can be heavy and cause inconvenience to carry and set up every time, the portable TensionPro Sonar is a convenient method to save time on carrying the tools and monitoring the data.

Features of TensionPro Sonar

TensionPro Sonar stores, transfers, and displays bolt elongation and load data in a portable unit. The hybrid measurement system uses the best of both analogue and digital signal processing techniques for fast signal acquisition and precise TOF measurement. The data can be viewed on a 4.3” touch screen.

The device also offers password protected data collection and real time signal tracking. The device is powered by battery and includes a fast charger. The device can store multiple jobs with the 256 MB storage.

About TensionPro Sonar Tool Rental

As an exclusive distributor of TensionPro in UAE and Middle East, ABS offers bolt elongation and load measurement services with the help of the TensionPro Sonar. This helps our customers benefit from the features of TensionPro with no capital investment and maintenance costs. The stress-free service allows the customer to pay only when required, i.e. only pay for the desired number of bolts with the help of our bolting expert and the TensionPro Sonar. All the documented reports recorded will be provided immediately for future traceability.

We hope this article offered you some insight on how adding a simple step can significantly save time, costs, and manpower. Visit us next time for more knowledge sharing articles that talk about modern bolting solutions.

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