Clarifications on blackout recovery requirements for DP notation closed bus-ties qualifiers

# Clarifications on DP Blackout Recovery Requirements

Classification society DNV has issued clarifications on blackout recovery requirements for Dynamic Positioning (DP) systems with closed bus-tie configurations, addressing technical gaps that have emerged from the application of these qualifiers to DP shuttle tankers. The guidance specifically targets propulsion systems driven by 2-stroke crosshead engines paired with particular switchboard configurations, establishing more detailed specifications to ensure consistent compliance and operational safety.

The development reflects broader evolution in DP system technology and the increasing complexity of power management on specialized tanker vessels. As operators deploy more sophisticated closed bus-tie architectures to optimize redundancy and fuel efficiency, classification standards must keep pace with engineering innovations that weren’t explicitly addressed in existing regulations. This clarification ensures that blackout recovery capabilities—critical for maintaining station-keeping ability during power failures—meet consistent technical benchmarks across different engine and electrical configurations.

For DP shuttle tanker operators and shipowners, the guidance provides essential technical direction for both new builds and retrofit projects. Clarified specifications reduce ambiguity during design phase reviews and certification processes, potentially accelerating approvals while strengthening safety outcomes. Compliance with these updated requirements ensures vessels maintain the operational reliability required for critical offshore support operations, where loss of position control carries significant environmental and commercial risks.