We have the safe Hot Bolting

Hot Bolting is the sequential removal, cleaning and replacement of bolts in a flanged joint, while the system is pressurized.

Hot Bolting clamp 3dAlthough most flanges are designed to keep integrity in case of removal of one bolt, this requires that the remaining bolts are of such quality that they can sustain the connections total loading and maintain the gasket stress. This requirement can seldom be verified for connections in need of Hot Bolting; thereof an external barrier is needed.

The Hot Bolting Clamp is designed to establish the safe barrier for Hot Bolting.


  • Mechanical control of the gasket stress
  • Equinor (Statoil) Technology Qualification
  • DNV GL type approval
  • FAT of each clamp – hydrostatic test 1.5 times the rated design pressure
  • Slim design – avoid clashes with connected equipment, valves or nearby piping and structure
  • Proven technology – in service since 2011

DNV GL TA For further information please contact us at HotBolting@HotBolting.com or call Per-Christian Irgens: +47 92 20 84 84.