Bolt Tensioning

Hydraulic Bolt Tensioning (1-1/4” through 3-1/2”)

Tensioning permits the simultaneous tightening of multiple bolts; the tools are connected in sequence via a high-pressure hose assembly to a single pump unit. This ensures each tool develops the exact same load and provides a uniform clamping force across the joint. This is especially important for pressure containing vessels requiring even gasket compression to affect a seal.

General Procedure

•          Step 1: The bolt tensioner is fitted over the stud
•          Step 2: Hydraulic pressure is applied to the tensioner which then stretches the stud
•          Step 3: The stud's nut is wound down against the joint face
•          Step 4: Pressure is released and the tool removed

The bolt behaves like a spring, when the pressure is released the bolt is under tension and attempts to contract, creating the required clamping force across the joint.

*** All equipment tested and certified.