LCO₂ Cargo Tank Pressure, Boil-Off, Reliquefaction & Cargo Conditioning Tool | ShipUniverse
IGC Code CO₂ 17.21 / 17.22 • MSC 111 CO₂ Amendments Approved • Phase Envelope • BOG • Reliquefaction • Conditioning • Filling Margin

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

Screen whether a liquefied CO₂ cargo can remain inside its approved pressure-temperature envelope through loading, transit and conditioning. The tool links tank inventory, pure-CO₂ phase behavior, cargo-specific triple-point protection, heat ingress, boil-off equivalent, reliquefaction capacity, pressure accumulation, thermal expansion, terminal receipt limits and cargo-quality readiness. It does not treat one LCO₂ pressure regime as universal.

Currency
Currency selector changes display only. No exchange-rate conversion is performed.

Cargo & Design Basis

Current IGC Code provisions already address carbon dioxide cargoes. The 2026 IGC amendment package covering CO₂ cargoes was approved at MSC 111 and is awaiting adoption at MSC 112. Use the vessel's approved Cargo Operations Manual, Certificate of Fitness, class basis and cargo-specific data as the controlling documents.

Illustrative engineering starting points only. They are not IMO pressure or temperature limits. The vessel's approved cargo system and project cargo specification control.
days.
% of geometric tank volume. Enter the approved project / tank filling limit.

Simple Tank System

m³ across all cargo tanks.
% of geometric volume.
°C.
bar absolute.
bar absolute. Use approved vessel set point.
bar absolute. Enter the approved pressure basis.
kW when Direct Heat is selected.

Advanced Cargo Tank Register

Each tank is evaluated independently. Enter the tank-specific heat leak, actual pressure, high-pressure alarm and relief / MARVS basis. The register drives the total cargo inventory and worst-tank verdict.

Tank Volume m³ Fill % Temp °C P bar(a) Heat kW HP alarm Relief / MARVS

Heat Ingress Basis

Advanced mode always uses each tank row's heat input.
kW/K for the total tank system.
°C.
% applied to UA heat ingress.
% cargo mass per day, used only when BOR mode is selected.
kJ/kg-K for pressure-accumulation and conditioning screening. Verify against the project property package.

Triple-Point, Pressure & Materials Envelope

IGC Code 17.21 requires the precise triple point of the cargo being carried to be supplied before loading. The automatic low-pressure action basis must retain at least 0.05 MPa margin above that cargo-specific triple point.

bar absolute. Pure CO₂ reference is about 5.18 bar(a).
°C. Impurities can shift the phase envelope.
bar absolute.
bar absolute at the most critical tank / line location.
°C. Enter approved tank / piping material limit.
°C. Enter project-specific operating envelope.
bar. Flags actual tank pressure that differs materially from pure-CO₂ saturation pressure.
bar above cargo-specific triple point. 0.05 MPa equals 0.5 bar.

Reliquefaction & Pressure Control

kg/h of CO₂ vapour equivalent.
% of nameplate capacity credited.
% above steady BOG equivalent.
kW at the entered nameplate condition.
currency / kWh.

Cargo Conditioning & Terminal Receipt Window

°C.
kW net refrigeration duty available to cool the bulk cargo.
%.
kW if the project uses controlled warming to meet receipt conditions.
°C.
bar absolute.

Cargo Quality & Impurity Screen

The defaults below are editable project / literature screening values, not universal IMO cargo specifications. Impurities can shift phase equilibrium, affect corrosion risk, increase liquefaction duty and change the cargo-specific triple point.

% 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 section values conditioning time only. It does not assign a monetary benefit to bypassing safety margins, venting CO₂ or delaying required maintenance.

kg/h equivalent, assumed usable for approved conditioning duty.
currency per hour actually saved.
Engineering limitation: Pure-CO₂ saturation properties are used only as a screening reference. Real captured CO₂ streams can contain water, N₂, O₂, H₂, Ar, CH₄, SO₂, H₂S and other impurities that shift phase equilibrium, alter density, change the triple point and affect corrosion / materials. Dynamic loading, flashing, Joule-Thomson effects, piping pressure drop, compressor maps, heat-exchanger pinch, non-equilibrium cargo behavior and relief sizing require the approved project thermodynamic model and class / flag review.
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 CO₂ provisions require the cargo-specific triple point to be supplied before loading, continuous low-pressure monitoring, automatic action before pressure falls too close to the triple point, material suitability for the lowest service temperature, and continuous CO₂ monitoring in enclosed spaces where cargo can accumulate. Reclaimed-quality CO₂ adds impurity / corrosion considerations. IMO's MSC 111 in May 2026 approved a broader IGC amendment package covering CO₂ cargoes; adoption is expected at MSC 112 in December 2026 with expected entry into force on 1 July 2028. Filling limits, pressure-temperature control, reliquefaction capacity, alarm set points and terminal acceptance remain vessel / project specific.
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