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Hydraulics Technology
Stud Tensioning
Variable Stud
Fixed Stud
Hydraulic Nuts
Stud Tensioning
The Advantages of Stud Tensioning
When you hold a stud or a bolt, it is hard to imagine that this sturdy object can act as a spring. In fact, the fasteners in a bolted joint do just that. They must be stretched at assembly with enough force to keep the joint firmly clamped together when it is placed in service. The joint can fail if the load in the fasteners is too low, too high, or if it is not uniform in every fastener.

Hydraulic tensioning systems are the simple and efficient answer to this problem. It is the tightening method that will help you control the costs of meeting Fugitive Emission regulations by reducing leakage and extending LDAR (Leak Detection and Repair) intervals. Hydraulic tensioning offers these important benefits:

Typical Applications

  • Pipeline Flanges
  • Pressure Vessels
  • Valves and Pumps
  • Manways
  • Heat Exchangers
  • Diesel Engines
  • Cranes Presses
  • Steam and Gas Turbines
  • Shaft Couplings
  • Coal and Rock Grinders
  • Catalyst Reactors

Accurate and Repeatable Stud Loading
The theory, and practice, of tightening with tensioners is simple. A tensioner is merely a special purpose hydraulic cylinder. The load it applies to a stud is a direct function of the cylinders area and the hydraulic pressure supplied by the pump. Since we closely control these functions, the load applied to the stud is highly accurate.

Uniform Stud Loading
Even loading in each stud is important, especially in applications requiring gaskets. HTI recommends multiple tensioners for applications with more than one stud. These tensioners are coupled to each other and to the pump. As the hydraulic pressure increases, the load in every stud is the same, and the flange comes together simultaneously and evenly.

Time and Labor Saving
Multiple tensioners, working together, save time. One operator can work most applications with a minimum of effort.

Ease of Use and Safety
Tensioners have a high power to weight ratio. They are lighter, less bulky and much easier to use than torquing tools. Tensioners are quiet and are safer to use than slugging wrenches or bolt heaters. The air or hand-powered hydraulic power supplies are inherently explosion proof.

Increased Stud Life
There is no thread seizing or galling with tensioning. Because the tightening and loosening process is the same, the stud and nut threads never see high friction loads.

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Tools for Industry Inc.,
812 Oceola Drive, P.O. Box 7555, Algonquin IL. 60102
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