Subsea Tensioning

Bolt Tensioning essentially provides a hydraulic load, which acts directly upon the stud bolt. This hydraulic load, commonly called the applied load, is calculated to cause the stud bolt to retain its specified residual load, when the hydraulic pressure in the tensioner is released. The Bolt Tensioner can be applied to a single bolt or any number of bolts, depending upon access and application.

To give the most accurate residual bolt loading and uniform compression of a joint, the tools are ideally applied in an arrangement where all the bolts can be simultaneously tensioned. In a gasket flange, a minimum of 50% of the bolts should be tensioned simultaneously.

This ensures that:
  • The gasket is compressed evenly throughout the operation.
  • All bolts have the same accurate residual bolt load.