IGC Code 17.21 / 17.22 • Cargo-Specific Triple Point • Tank Pressure • Heat Leak • BOG Equivalent • Reliquefaction • Conditioning • Terminal Receipt

LCO₂ Cargo Tank Pressure, Boil-Off, Reliquefaction & Cargo Conditioning Tool

Screen whether liquefied CO₂ remains inside its approved cargo pressure-temperature envelope and whether the installed pressure-control/reliquefaction system can absorb steady heat ingress. Advanced mode adds tank-by-tank limits, pressure accumulation, cargo quality, conditioning and terminal receipt readiness.

Figures represent Currency
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Need much more depth? Click Advanced above.Advanced adds multiple cargo tanks, approved filling limits, cargo-specific triple-point temperature, MARVS / HP alarm margins, no-reliquefaction pressure accumulation, terminal conditioning, cargo impurities, multiple reliquefaction trains, readiness checks and upgrade economics.
Fast10 primary inputs
Core answerPressure envelope + reliq capacity
VisualPhase margin + BOG capacity

Single Cargo-System Screen

The cargo-specific triple-point pressure and the vessel's approved high-pressure operating limit are controlling inputs. The pure-CO₂ saturation curve shown in results is only a thermodynamic reference.

m³.
% of geometric volume.
°C.
bar absolute.
bar absolute. Use cargo-specific supplied value.
bar absolute, approved vessel/project limit.
kW total cargo system.
kg/m³ at cargo condition.
kJ/kg for BOG-equivalent screening.
kg/h CO₂ vapour equivalent.

Cargo, Voyage & Approved Envelope

days.
% geometric volume.
kg/m³.
kJ/kg.
kJ/kg-K for no-reliq warming and conditioning screen.
bar. Screening only, impurities shift equilibrium.
Current regulatory basis: IGC Code 17.21 requires the precise triple point of the cargo being carried to be supplied before loading. Alarms and automatic actions are to be set at least 0.05 MPa above that cargo-specific triple point. Reclaimed-quality CO₂ also requires cargo-system materials to account for possible corrosive impurities.

Advanced Cargo Tank Register

Each tank is evaluated independently for filling, low-pressure, high-pressure, temperature and pure-CO₂ saturation-reference deviation. Tank names remain on screen only and are not sent through Tool Data.

TankVolume m³Fill %Temp °CP bar(a)Heat kWHP alarm bar(a)Relief / MARVS bar(a)

Triple Point, Pressure & Material Envelope

bar absolute.
°C.
bar absolute. Must preserve at least 0.5 bar above entered triple point.
bar absolute.
°C tank/piping material basis.
°C project operating envelope.

Reliquefaction & Pressure Control

kg/h CO₂ vapour equivalent.
% of nameplate capacity credited.
% above steady heat-load BOG equivalent.
kW.
selected currency/kWh.

Cargo Conditioning & Terminal Receipt Window

°C.
kW net refrigeration duty.
%.
kW, if project intentionally warms cargo.
°C.
bar absolute.

Cargo Quality & Impurity Screen

These are project-specification entries, not universal IMO cargo limits.

% v/v.
% v/v.
ppm.
ppm.
% v/v.
% v/v.
ppm, informational project-spec entry.
ppm, informational project-spec entry.

IGC / Cargo-System Readiness

Optional Capacity Upgrade & Schedule Economics

This values conditioning time only. It never assigns value to venting CO₂, bypassing safety limits or delaying required corrective action.

kg/h equivalent.
selected currency/hour actually saved.
Thermodynamic limitation: real captured CO₂ streams can contain N₂, O₂, H₂, Ar, CH₄, water, SO₂, H₂S and other impurities that shift phase equilibrium, density, triple point, corrosion behavior and refrigeration duty. Pure-CO₂ saturation values in this tool are a visual screening reference only. Dynamic flashing, Joule-Thomson effects, compressor maps, pressure drop, heat-exchanger pinch, relief sizing and non-equilibrium cargo behavior require the approved project thermodynamic model.
Regulatory / engineering basis: current IGC Code chapter 19 lists Carbon Dioxide (high purity) and Carbon Dioxide (reclaimed quality), with special requirements in 17.21 and 17.22. The cargo-specific triple point is to be supplied before loading, low-pressure alarms/automatic actions are to preserve at least 0.05 MPa margin above that triple point, cargo-system materials are to suit the lowest service temperature, and enclosed spaces where CO₂ may accumulate require continuous monitoring. Reclaimed-quality CO₂ adds impurity/corrosion considerations. MSC 111 in May 2026 approved broader draft IGC Code amendments, subject to adoption at MSC 112, with expected entry into force on 1 July 2028. Vessel-specific Certificate of Fitness, Cargo Operations Manual, class basis and approved cargo property package remain controlling.
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