What is hydraulic tensioning?
A hydraulic bolt tensioning tool provides a quick and easy method for tightening large diameter bolts to high and accurate pre-loads. Unlike conventional methods it does not use torque and does not require any forceful turning of the nut or bolt, like impact wrenches, flogging spanners or hydraulic torque wrenches.
What is difference between torquing and tensioning?
Bolt torque and bolt tensioning are both legitimate ways to seal a joint. Bolt torquing exerts a rotational force on the fastener, while bolt tensioning involves stretching a fastener with what looks like a hydraulic load cell.
What is advantage of using hydraulic tensioning when installing a nut?
Hydraulic bolt tensioning provides: Accuracy – very high bolt load tolerance accuracies, often 5% or better. No frictional losses to consider nor need for lubrication. Easy to calculate load transfer and to prevent overload. Speed – the tools are remarkably fast to install and operate.
What is tensioning bolt?
What is Bolt Tensioning. Tensioning is the direct axial stretching of the bolt to achieve preload. Inaccuracies created through friction are eliminated. Massive mechanical effort to create torque is replaced with simple hydraulic pressure. A uniform load can be applied by tensioning multiple studs simultaneously.
How does a hydraulic timing chain tensioner work?
A timing chain tensioner is provided so as to control tension of the timing chain surrounding the sprocket of the crankshaft and the sprocket of the camshaft. Particularly, a hydraulic pressure timing chain tensioner is configured to control tension of the timing chain by using a hydraulic pressure.
How does a hydraulic torque wrench work?
The hydraulic torque wrench works by using the power generated by the hydraulic pressure. Its function is mainly to adjust the tightness of the bolt, thereby promoting the smooth development of the production work and helping people to reduce the burden.
What is the formula for hydraulic bolt tensioning?
Calculation notes on using Hydraulic bolt tensioning tools. Formula to use: Units: Residual Bolt Load = (N or Tons) Bolt Tensile Stress Area = (mm2 or In2) Below are tables of standard ISO Metric and Imperial Thread forms along with applicable tensile stress area’s.
Which is better hydraulic tensioner or conventional tensioner?
Hydraulic bolt tensioning provides a quick and easy method for tightening large diameter bolts to high and accurate preload. The illustration of the conventional bolt tensioner components also shows that the bolt being tensioned needs to be longer than conventional bolts by one diameter.
What’s the difference between torquing and hydraulic tensioning?
Or if you’re simply using a very large bolt, torquing may not be feasible, in which case you need to turn to hydraulic tensioning. Hydraulic tensioning doesn’t achieve the same yield strength as torquing. While the bolt is stretched to 90 percent of its yield strength, the bolt springs back after the hydraulic pressure is relieved.
How does hydraulic tensioning work on a lock?
Hydraulic tensioning: A jack is attached to the bolt, and high-pressure hydraulics is used to stretch the bolt and lift the nut clear of the flange. The nut is then easily turned down back to the flange surface. When the hydraulic pressure is released, the stretched bolt creates clamping force as it attempts to revert back to shape.