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Learnings

Your bolting knowledge hub. Learn from the experts.

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Explore our tools that make your working day easier.

SUSTAINABILITY

Contributing to a brighter tomorrow.


Learnings

Your bolting knowledge hub. Learn from the experts.

DIGITAL TOOLS

Explore our tools that make your working day easier.

SUSTAINABILITY

Contributing to a brighter tomorrow.

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Superbolt® Load-Sensing Tensioners

Experience safer, more efficient bolt tightening operations in critical applications with Superbolt tensioners featuring built-in preload monitoring systems

  • About Superbolt
  • LST
  • CAD files | Superbolt
image

MONITOR PRELOAD THE SMART WAY

As the global market leader of bolting solutions, Nord-Lock Group is dedicated to improving our already state-of-the-art products – including the integration of smart technologies. The Superbolt Load-Sensing Tensioner (LST) measures the preload of a multi-jackbolt tensioner with an accuracy that is better than ±5%! The LST features a wealth of benefits without the need for any modification of the bolted joint.

Additional information

How it works

Under the effect of a bolt axial load, the Superbolt MJT nut body undergoes a hoop stress thereby causing radial expansion (flexing in at top and out at bottom).

Measuring the expansion with respect to the nut body circumference, however, enables a wider and more accurate response. By controlling the relationship between circumferential expansion and the axial preload, it becomes possible to monitor preload from this unique feature.

Product benefits

  • Remote preload monitoring and a live reading of data
  • Facilitates more uptime during service
  • Precise and repeatable preload reading
  • Eliminates the need for modifications of the bolt
  • Seamless to retrofit/upgrade — simply replace original nut with the LST
  • Robust and reliable, IP67-classed
  • Accurate preload verification without adjustment of clamped parts
  • No alteration needed of the assembly (including stud or joint design or geometry)
  • Removes risk of injuries for operators in hazardous areas
  • Eliminates high costs on labor, additional measuring devices, and periodic verification by maintenance

Downloads

Downloads

Download

View

  • Superbolt - LST Brochure.pdf

  • Superbolt - LST Offerings.pdf

  • Superbolt - LST Technical Brochure.pdf

  • Tensioning - Application Checklist.pdf

Improving Wind Farm Performance: A Guide to Monitoring Preload in Bolted Joints

Secure bolted joints are critical for the operation and safety of infrastructure but ensuring that these joints are tightened, and stay tightened, to the correct preload can be a challenging task. As wind turbines get bigger - in increasingly harsh environments or on floating platforms - bolted connections are reaching their capacity limits and are often complex to design, install, and maintain.

Traditional methods for monitoring preload, such as using torque wrenches or ultrasonic measurement, can be time-consuming and inaccurate. Now, with the advancement of SMART technologies, it's possible to install sensors on the joint and monitor the preload remotely – transmitting data via a Cloud and reading it from a smartphone or computer dashboard.

In this video, we will focus on the role of Nord-Lock Group’s SMART solutions - Superbolt Load-Sensing Tensioner (LST) and Superbolt Load-Sensing Flexnut (LSF) - for monitoring bolted joints in the wind industry and how they can help to improve safety, efficiency, and performance of wind turbines.

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