LCO2 Shipping: The Cargo Arriving on Your Vessel Next — What You Need to Know Now

Carbon capture and storage — the technology that pulls CO₂ from industrial emissions and locks it underground — depends on one critical transport link: getting the captured gas from the capture site to the storage location. For offshore storage, that means ships. And those ships will carry liquid CO₂ — a cargo most merchant seafarers have never encountered, in a market that barely existed five years ago and is now scaling rapidly across Northern Europe and beyond.

UK P&I Club's latest technical guidance flags the risks clearly and early. The timing matters: the vessels being built now will enter service while the regulatory framework is still being written and while crews are still learning. That combination — new cargo, incomplete rules, inexperienced handlers — is exactly the profile that precedes serious incidents. This article is a plain-language introduction to what liquid CO₂ actually is, how it behaves, and what the current guidance says every seafarer working with it needs to understand.

What Liquid CO₂ Actually Is

CO₂ in its liquid state exists at low temperature and elevated pressure — typically around -28°C and 15 bar for transport purposes. Unlike LNG, which is cryogenic (around -162°C), LCO₂ is cold but not ultra-cold. This creates a specific set of hazards that don't map neatly onto either LNG experience or conventional chemical tanker experience.

The key risks UK P&I identifies:

• Asphyxiation. CO₂ is colourless, odourless, and heavier than air. A leak in a confined or low-lying space — an engine room bilge, a cargo pump room, a void space — will displace oxygen silently. There is no smell warning. Personnel entering without atmospheric testing can lose consciousness within seconds at concentrations above 5%.
• Pressure release and cold burns. LCO₂ under pressure, if rapidly released, undergoes Joule-Thomson cooling — the escaping gas can reach temperatures cold enough to cause immediate freeze burns on contact with skin.
• Dry ice formation. Rapid depressurisation can cause CO₂ to convert directly to solid dry ice — which can block relief valves and piping in ways that create secondary pressure hazards.
• Fire suppression system conflicts. Some vessels use CO₂ fixed fire suppression; adding a significant CO₂ cargo creates logistical and safety questions about alarm response, system testing, and personnel evacuation procedures.

Where the Regulatory Framework Stands

LCO₂ shipping is governed at IMO level under the IGC Code (International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk). However, the specific requirements for CO₂ carriers — particularly large-scale CCUS transport vessels — are still being developed. The IMO's CCC sub-committee is the body working on this, and the framework is expected to evolve significantly over the next few years.

For seafarers, the practical implication is straightforward: if you're offered a position on an LCO₂ vessel, ask specifically about the crew training programme. What atmospheric monitoring systems are fitted? What are the emergency procedures for a cargo leak? Has the emergency response been drilled with this cargo type, not just generic dangerous goods procedures? The answers will tell you a great deal about the operator's preparedness.

This is an emerging sector. The officers who develop genuine expertise in LCO₂ operations now will be in significant demand as the fleet scales over the next decade. For seafarers tracking their specialist cargo experience on Crew Connect, this is worth logging from the first voyage.