LNG Bunkering at Ports: New Safety Protocols Terminal Operators Must Know
LNG bunkering at ports has grown from a niche operation to a mainstream fueling method, with IMO reporting over 1,100 LNG-capable vessels in service or on order as of January 2026. This growth forces terminal operators to confront safety protocols for handling cryogenic fuel at minus 162 degrees Celsius in proximity to active cargo operations, personnel, and passengers.
Why Is LNG Bunkering Different from Conventional Fueling?
Conventional marine fuel oil is a stable liquid at ambient temperatures. LNG is a cryogenic liquefied gas that becomes flammable when it vaporizes and mixes with air at concentrations between 5% and 15%. A leak during bunkering creates a visible vapor cloud that can travel hundreds of meters before dispersing. The consequence modeling is fundamentally different from diesel or heavy fuel oil spills. DNV's QRA methodology for LNG bunkering operations identifies vapor cloud ignition as the primary hazard, with thermal radiation zones extending up to 200 meters depending on leak rate and wind conditions.
What Do the New IMO Guidelines Require?
IMO's Maritime Safety Committee adopted revised guidelines for LNG bunkering in 2025 under MSC.1/Circ.1622, building on the IGF Code framework. Key requirements include a mandatory safety zone around the bunkering manifold, typically 25 to 50 meters depending on the risk assessment. Continuous gas detection monitoring throughout the bunkering operation. Emergency shutdown systems capable of isolating the fuel transfer within 30 seconds. A ship-shore compatibility assessment completed before every bunkering operation. Pre-transfer safety meetings between the bunker vessel crew, receiving vessel, and terminal operator.
How Does LNG Bunkering Affect ISPS Security Operations?
The ISPS Code requires port facility security plans to address any operation that introduces elevated risk to the facility. LNG bunkering qualifies. During bunkering operations, the safety zone overlaps with security zones, creating coordination challenges. Vehicle and personnel access must be restricted around the bunkering area. Ignition sources — including certain security equipment, mobile phones in non-ATEX zones, and vehicle engines — must be controlled. Fire watch teams must be stationed at the bunkering manifold and at defined positions along the safety perimeter. BIMCO's 2025 guidance recommends that port facility security officers integrate LNG bunkering into the facility's security drills at least quarterly.
What Infrastructure Changes Do Terminals Need?
Terminals accommodating LNG bunkering require gas detection sensor networks covering the bunkering berth and adjacent areas. Fixed firefighting systems rated for LNG fires, including dry powder and high-expansion foam. Cryogenic-rated emergency response equipment for personnel. Wind monitoring stations providing real-time data to bunkering operators. Communications systems linking the bunker vessel, receiving vessel, terminal control room, and emergency services.
The capital investment is significant. DNV estimates that retrofitting an existing berth for LNG bunkering compatibility costs between $3 million and $8 million, depending on existing infrastructure and local regulatory requirements.
What Are the Most Common Operational Risks?
Analysis of LNG bunkering incident reports from 2023 through 2025 shows three recurring issues. Hose connection failures account for 38% of reported events. Communication breakdowns between ship and shore teams account for 27%. Weather condition misjudgments — particularly wind shifts during truck-to-ship bunkering — account for 19%.
Conclusion
LNG bunkering at ports introduces a hazard profile that terminal operators cannot manage with existing fuel oil procedures. The combination of cryogenic temperatures, flammable vapor risks, and regulatory requirements under both IMO and ISPS frameworks demands purpose-built safety protocols, infrastructure investments, and ongoing training. Terminals that delay this preparation will face both regulatory enforcement and operational disruption as the LNG-fueled fleet continues to expand.