Ammonia Bunkering Transfer, Toxic Release, Ventilation, ESD/ERS & Safety Zone Tool
MSC.1/Circ.1687 • Ammonia Transfer • Tank Fill • ESD / ERS • 110 / 220 ppm • Ventilation • Toxic Area • Hose Integrity
Ammonia Bunkering Transfer, Toxic Release, Ventilation, ESD/ERS & Safety Zone Tool
Turn an ammonia bunker plan into a fast transfer-safety screen, then use Advanced for line hydraulics, hose pressure, ESD/ERS residual release, vapour-equivalent source, ventilation dilution, detector actions, toxic-area clearance, bunkering time and retrofit cost. Dispersion distances must come from approved project analysis, not this calculator.
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Need much more depth? Click Advanced above.Advanced adds Darcy pressure drop, hose burst/test status, detailed ESD valve closure, ERS trapped-liquid release, ammonia vapour-equivalent screening, enclosed/semi-enclosed ventilation, detector logic, PRV/vent toxic areas, bunkering time and five-year system economics.Fast10 primary inputs
Core answerTank + flow + ESD + toxic-zone screen
Safety boundaryNo calculator-derived plume radius
Open-Deck Bunkering Quick Screen
Use the approved vessel, supplier and risk-assessment limits. Simple intentionally does not calculate toxic dispersion or enclosed-station ventilation.
tonnes.
kg/m³ at representative transfer condition.
m³.
% gross volume.
% gross volume from approved tank/fuel basis.
m³/h.
m³/h, limiting approved ship/supplier/system value.
seconds from event to effective liquid isolation for conservative Simple screening.
m from approved/QRA dispersion analysis. Enter 0 if not established.
m from bunkering release source.
Ammonia Quantity & Receiving Tank
tonnes.
kg/m³.
mPa·s, project value.
m³.
%.
%.
% gross volume.
Transfer Rate & Hydraulic Limits
m³/h.
m³/h.
bar(g).
%.
bar(g).
bar beyond explicit route K values.
bar(g).
% above steady required pump discharge.
Build one representative hydraulic path. Flow share lets common headers carry 100% and branch hoses carry only their share.
| Segment | Length m | ID mm | Roughness mm | Minor K | Elevation m | Flow share % |
|---|
Hose, ESD & ERS
bar(g). IMO ammonia guidance: not less than 5× maximum bunkering pressure seen by hose.
Guidance interval not more than 5 years.
s at full-flow equivalent.
s at full-flow equivalent.
s.
% of bulk flow.
m.
mm.
% trapped liquid retained/captured on separation.
s.
% bulk flow.
Toxic Release & Ventilation Screen
% of exposed liquid mass. Project/risk-assessment input, not a universal flash fraction.
% of vapour-equivalent source captured/treated by approved mitigation.
°C for ideal-gas equivalent.
s over which vapour-equivalent source enters ventilation screen.
m³. Used only when station is not open deck.
m³/h.
% of entered design airflow.
% project readiness threshold.
Detector Actions & Toxic-Area Clearance
IMO guidance applies detector voting where gas detection causes shutdown.
ppm. Current IMO bunker-station alarm reference: 110 ppm.
ppm. Current IMO bunker-station safety-action reference: 220 ppm.
m from approved dispersion analysis. 0 means not established.
m.
m.
m.
Current IMO toxic-area screen: open-deck areas within 10 m of ammonia flanges, valves and other potential leakage sources are toxic areas. Tank PRV and other fuel-gas vent outlets use B or 25 m, whichever is less. Approved dispersion analysis must also demonstrate that concentrations above 220 ppm do not reach protected non-toxic openings/spaces.
Bunkering Time & Commercial Inputs
min.
min.
% of bunker volume.
% of bulk transfer rate.
min.
selected currency/hour.
selected currency/year.
2026 Ammonia Bunkering Readiness
Engineering / toxic-release screening only: this tool is not an approved ammonia bunkering standard, HAZID/HAZOP, QRA, CFD dispersion model, transient surge calculation, ERS certification, functional-safety assessment, toxic-exposure model, emergency-response plan or port authorization. The ventilation model is deliberately well-mixed and must not be used to establish a personnel exclusion distance. Use Administration/class/port-approved bunkering and dispersion analyses for the actual vessel and supplier.