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Oil Riser Change-out - Flexible DBB Isolation & Services

Supply of flexible DBB Twin Tyre Isolation Plugs and services for maintanence repair work or riser change-out operations on miter joint connection risers, where standard solutions cannot navigate.


DBB Localised pipeline isolation / IK-Field Service


June 2015 - October 2015


Brunei, South China Sea

Project Manager:

Peter Bjørnsen

Riser repairs involve replacing some sections of the risers and possibly replacing some whole riser sections/segments over sea level. This work entails cutting and welding operations.

IK-Norway has significant experience in this field, together with specially-designed flexible plugs for double block and bleed (DBB) weld isolating and cold cutting of the depressurised risers. A DBB barrier is essential when performing hot work operations on hydrocarbon process pipelines.

Tool specifications for riser change out operations:

  • Double block & bleed function/facility
  • All materials are tolerant to hydrocarbon process systems
  • Maximum operation pressure: 60°C
  • To hold a minimum differential pressure of 1 bar
  • Double block seal verification pressure, maximum 3 bar
  • Plug annulus can be filled and monitored with water or gas
  • Operating temperature: -10°C to +60°C (+90°C intermittent)
  • Flexible connection between isolation barriers
  • Plug must navigate through miter joints and piggable bends


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