MARPOL Annex VI Reg. 15 • VOC Management Plan • VECS • Vapour Growth • Compressor Duty • Capture • Recovery • ROI
Crude-Oil VOC Vapour Recovery, Compressor Capacity & Emissions-Capture ROI Tool
Estimate crude-oil loading vapour generation, normalize vapour flow, screen recovery-system capacity, calculate indicative compressor power, quantify VOC capture and recovered hydrocarbon, and test whether the installed package creates a credible annual operating and investment case.
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Need much more depth? Click Advanced above.Advanced adds multiple cargo/terminal cases, measured mass-flow override, tank-pressure and VECS gates, compressor staging/turndown, P/V valve margin, terminal limits, annual OPEX, NPV, future-rule screening and VOC-plan readiness.Fast10 primary inputs
Core answerCapacity + capture + payback
VisualFlow gauge + mass balance + economics
Single Loading Case
Simple mode uses disclosed thermodynamic and economic defaults so the user can answer the core question quickly. Advanced exposes all important system assumptions.
m³/h liquid cargo.
Actual m³ tank vapour generated per m³ liquid loaded.
vol% non-methane hydrocarbon.
kg/kmol.
Nm³/h total vapour at 0°C and 1.01325 bar abs.
% of modeled VOC reaching the recovery train.
hours/year.
selected currency/t recovered.
selected currency/kWh.
selected currency.
Regulatory & Operating Basis
Draft 2026 amendment is not yet adopted as of Sep. 9, 2026.
2026 future-rule status: MEPC 84 approved draft MARPOL Annex VI amendments for new crude-oil tankers to use P/V devices with opening pressure not less than 0.20 bar gauge. Adoption is scheduled for consideration at MEPC 85 (30 Nov to 3 Dec 2026). This is an informational future-design screen only.
Advanced Cargo / Terminal Loading Cases
Each row is an independent loading case for system sizing, but its hours/call × calls/year contribute to the annual economics. Cargo/terminal labels remain on screen only and are not sent through Tool Data.
| Cargo / terminal | Load m³/h | Growth | Temp °C | Tank barg | Atm bara | VOC vol% | MW | Direct VOC kg/h | Hours/call | Calls/yr |
|---|
Tank Pressure, VECS & Loading Limits
bar gauge.
bar gauge, vessel-specific approved setting.
bar at maximum vapour flow.
% of P/V setting. Confirm approved VECS manual.
m³/h. 0 disables gate.
Nm³/h. 0 disables gate.
Recovery Compressor & Processing Train
Nm³/h.
% reduction for ambient, fouling or owner margin.
% of one compressor rated capacity.
% of captured VOC converted to recovered product.
% above normalized generated vapour flow.
bar gauge.
bar gauge.
thermodynamic + mechanical screening efficiency.
Annual Utilization & Economics
selected currency/t.
selected currency/kWh.
selected currency/t captured. User-entered only.
% of modeled VOC generation assumed to reach atmosphere without recovery.
years.
%.
years. Owner economic screen only.
VOC Plan, VECS & Safety Readiness
Engineering limitation: vapour growth, VOC composition, molecular weight, pressure behavior, compressor performance, condensation yield, vent hydraulics and terminal interface are highly cargo- and installation-specific. This tool is a screening and investment model, not a VECS approval, P/V sizing calculation or authorization to change tank-pressure settings.