Dual-Fuel Conversion, Tank Footprint, Safety Integration & Retrofit Economics

Alternative-Fuel Engine Retrofit, Fuel-System Integration, Tank Space & Payback Tool

Screen whether an existing ship can realistically convert to methanol, ammonia, LNG, LPG, HVO, liquid hydrogen or another fuel. Translate the vessel's current fuel demand into alternative-fuel mass and tank volume, test fuel-system and safety integration readiness, estimate cargo-space impact, build retrofit capex, compare annual fuel and carbon economics, and calculate payback, NPV and break-even fuel prices.

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

Vessel & Existing-Fuel Baseline

Use annual measured fuel consumption if possible. The calculator preserves the vessel's annual propulsion-energy requirement and then determines how much alternative fuel is needed after the entered relative engine-efficiency assumption.

t/year
MJ/kg
t/m³
$ / t
days/year
days
%
m³
$ / m³/year
years

Alternative Fuel Physical & Engine Assumptions

Selecting a fuel applies an editable physical-property screening preset for lower heating value and liquid density only. Storage-system footprint, engine efficiency, pilot share, lifecycle intensity and commercial assumptions remain project inputs.

MJ/kg
t/m³
%
100% means the same fuel-energy input is required to produce the same useful propulsion work.
%
MJ/kg
$ / t
$ / t
%
× tank volume
Adds planning space for tank geometry, cofferdams, insulation, access, pumps, piping or other arrangement impacts. Replace with project layout data.

Alternative-Fuel Candidate Comparison

Compare multiple fuel concepts against the same vessel, integration-readiness and retrofit-cost basis. The capex override is total non-off-hire retrofit capex before contingency. Enter 0 to use the shared retrofit-cost build below.

Fuel LHV MJ/kg Density t/m³ Relative eff % Pilot energy % Fill % Space factor Fuel price / t Lifecycle gCO2e/MJ Capex override Maint delta / yr

Fuel-System & Safety Integration Readiness

%
%
%
%
%
%
%
%
%
%

Retrofit CAPEX Build

$
$
$
$
$
$
$
$
days
$/ day
%
$

Annual Operating, Carbon & Compliance Economics

Lifecycle GHG intensity is intentionally user-entered because production pathway, certification boundary and regulatory treatment matter. The default values are placeholders for demonstration, not claims about any fuel pathway.

gCO₂e/MJ
gCO₂e/MJ
gCO₂e/MJ
$/ tCO₂e
$
Positive means alternative-fuel operation costs more. Negative means savings.
$
$
$
Optional value for charter preference, internal carbon target, avoided compliance burden or similar benefit not otherwise modeled.
years
%
Engineering and investment screening only: This tool is not class-approved, statutory, OEM-certified, HAZID / HAZOP, fire-safety, toxic-release, cryogenic, tank-design, stability or detailed naval-architecture analysis. Fuel density, usable fill, tank arrangement, hazardous areas, ventilation, detection, containment, bunkering, engine rating, pilot share, methane / nitrous-oxide effects, lifecycle GHG treatment and fuel availability must be verified for the actual project.
Regulatory reference: Alternative-fuel retrofit requirements vary by fuel, vessel type, installation, flag and class. Before using this screen for procurement, check the latest IMO fuel-specific safety guidance, applicable code requirements, approved alternative-design pathway where relevant, and current seafarer-training requirements.
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