Bolt Tensioning

Accurate Load Control for Large Diameter Fasteners

Bolt Tensioning Services

Eliminate Bolt Relaxation

For critical joints where friction losses from torquing can be a variable, Bolt Tensioning is the preferred method for achieving accurate bolt loads. Velcorix offers hydraulic tensioning services that apply direct axial load to the bolt, stretching it to the required tension without turning the nut.

This method eliminates friction, ensuring uniform compression of the gasket and zero torsional stress on the fastener.

Scope / What’s Included

Topside Tensioning

For general piping and structural applications.

Subsea Tensioning

Specialized equipment for underwater flange tightening.

Wind Turbine Bolts

Foundation and tower flange tensioning services.

Engineering Support

Calculation of pump pressures and residual loads.

Typical Real-World Applications

High Pressure

Reactor heads and heat exchanger channel heads.

Subsea Lines

Pipeline tie-ins and riser clamps.

Power Gen

Turbine casing bolts and foundation anchors.

Construction

Tensioning of large bridge cable clamps.

Capability Details

Bolt tensioning provides the most accurate method for tightening large diameter bolts.

  • Synchronous Loading: We can achieve 50% or 100% bolt coverage to tension multiple bolts simultaneously, ensuring perfectly even gasket compression.
  • High-Capacity Tools: Our fleet includes tensioners capable of handling bolts up to 4 inches in diameter and pressures up to 1500 bar.
  • Speed: Faster than torquing for large flanges due to simultaneous tightening capability.
Tensioning Capabilities

Compliance & Support

Calibration

High-pressure pumps calibrated to international standards.

Safety

Rigorous high-pressure safety training for all operators.

Data Logging

Recording of applied pressures and residual loads.

Accuracy Matters

Trust Velcorix for precise bolt tensioning services on your critical assets.

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