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STANDARD HYDRAULIC TENSIONERS

Boltight’s standard range of hydraulic bolt tensioners are designed for general use on top side applications. Each tool comprises of a hydraulic cylinder, bridge, puller and socket. Interchangeable adaptor kits fit common hydraulic cylinders to enable the tightening of multiple bolt sizes.
Boltight solutions make it possible to tighten and loosen multiple bolts simultaneously using high-pressure hydraulics. Bolt tensioners stretch the bolt before the nut is wound down under zero friction, ensuring extreme accuracy, speed and uniformity.

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How it Works
1- A tensioner is attached to the bolt or stud.
2- High-pressure hydraulics are used to axially stretch the bolt
3- Bolt stretch/elongation creates the clamping force, as the bolt is stretched, the nut lifts clear of the flange
4- An access window in the tensioner allows the nut to be turned down with very little friction
5- When the hydraulic pressure is released, the nut traps the stretch in the bolt retaining the ‘load’
Advantages
  • Tension is applied directly to stretch the bolt, meaning that no friction needs to be overcome
  • Applied load is very accurately controlled, as it is directly proportional to the pressure applied to the hydraulic bolt tensioner
  • Loss of load between applied and retained load after tensioning is 20% less than frictional loss associated with torque
  • Accurate residual load outcomes due to calculable load loss Tensioning can be repeated