Subsea Hot Tapping & Line Plugging

Pipelines are vital to the safe and efficient transportation of hydrocarbons; as such failures within these pipelines can have huge environmental, safety and reputational implications. STATS has extensive experience of providing subsea hot tapping and line plugging services on piggable and unpiggable pipelines which comply with all relevant subsea isolation guidelines.

The BISEP® provides the highest level of hot tap installed pipeline isolation in the industry and ensures safe worksite conditions for divers from breaking of containment to pipeline reinstatement.


The BISEP is the only hot tap installed double block isolation tool that satisfies the design criteria for DNV Type Approval for Pipeline Isolation Plugs. The design criteria satisfies the requirements for Pipeline Isolation Plugs to provide dual seal and isolation in accordance with Offshore Standards: DNV-OS-F101 (Submarine Pipeline Systems) and recommended Practices: DNV-RP-F113 (Subsea Pipeline Repair) and is code compliant with: ASME BPVC Section VIII, Division 2.

8in Subsea BISEP deployment

The use of the BISEP provides a high integrity, temporary subsea isolation that offers operators significant benefits by avoiding the need to decommission and then recommission the entire subsea infrastructure. Subsea hot tapping and plugging allows safety critical repair or maintenance of pressurised pipelines while providing the highest level of safety to divers and avoiding environmental impact.



3” to 56”


153 bar / 2220 psi


DNV Type Approval


  • Pipeline tie-in / re-routing
  • Sectional pipeline replacement / repair
  • Riser replacement / repair
  • Valve installation, replacement / repair
  • Pressure testing, leak detection of risers or repaired pipelines
  • Isolation of subsea manifolds or skids for repair or replacement
  • Dead leg removal
  • Platform / pipeline abandonment, bypass, or decommissioning

Related Resources


10" Subsea Hot Tapping and Plugging, Gulf of Mexico

STATS Group was contracted to assist with the isolation and abandonment of a 10” oil pipeline in the Gulf of Mexico, at a water depth of approximately 25 meters. The ...
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14” Subsea Pipeline Isolation & Repair, East China Sea

14” Subsea Pipeline Isolation & Repair, East China Sea

Following on from the success of significant subsea pipeline isolation and repair projects completed for the 28” Yacheng Pipeline in China and 8” subsea pipeline in the ...
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8” Subsea Pipeline Isolation & Repair, Gulf of Thailand

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Subsea Repair Scenarios of Damaged Pipelines

Subsea Repair Scenarios of Damaged Pipelines

Pressurised pipeline repair facilitated by non-piggable and piggable type approved isolation tools
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Temporary Line Plugging

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