Liquid Ammonia Transfer, Darcy Pressure Drop, Hose Burst Margin, ESD/ERS Release, 110/220 ppm Detection, Ventilation Dilution & Toxic-Zone Readiness

Ammonia Bunkering Transfer, Toxic Release, Ventilation, ESD/ERS & Safety Zone Tool

Turn an ammonia bunker plan into the hydraulic, toxic-release and emergency-response numbers that can stop the operation. Calculate tank receiving capacity, safe transfer rate, hose velocity and pressure drop, pump power, high-high ullage, post-ESD liquid movement, ERS residual release mass, ambient vapour-equivalent volume, enclosed-space concentration and purge time, required dilution airflow, IMO 110/220 ppm detector thresholds, minimum open-deck toxic areas, dispersion-model safety-zone clearance, bunkering time and five-year system cost.

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

Ammonia Quantity & Receiving Tank

The receiving-tank limit is checked before the transfer-system and toxic-release calculations. Density and viscosity are editable because refrigerated and pressurized ammonia conditions differ.

tonnes.
kg/m³ at representative transfer condition.
mPa·s, editable project value.
m³.
% gross volume.
% gross volume.
% gross volume.
% gross volume used for post-ESD ullage screen.

Transfer-Rate & Pump Limits

m³/h total liquid rate.
m³/h.
m³/h approved vessel limit.
m³/h.
m³/h each.
m/s project / OEM criterion.
bar(g).
%.
bar(g) during transfer.
bar beyond explicit route K values.

Simple Ammonia Transfer Route

m carrying total flow.
mm.
mm.
m.
mm.
mm screening value.
m. Negative value reduces static head.

Advanced Ammonia Transfer Route Register

Build one representative hydraulic path from delivering pump to receiving tank. Flow share lets a common header carry 100% while one branch of a two-hose system carries 50%.

SegmentLength mID mmRoughness mmMinor KElevation mFlow share %

Hose / Loading Arm Pressure & Inspection

bar(g).
bar(g). IMO ammonia guidance calls for at least 5× the maximum pressure the hose can see during bunkering.
bar(g).
% above steady required discharge for screening.
IMO guidance says periodic hydrostatic testing at intervals not more than five years.
litres available to retain an exposed liquid release.

ESD Shutdown, High-High Ullage & ERS Release

s at full flow.
s at full-flow equivalent.
s.
% of bulk flow.
m.
mm.
% retained / captured at separation.
s.
% of bulk flow during any remaining isolation interval.

Toxic Release & Vapour-Equivalent Screen

A liquid ammonia release can flash, aerosolize, remain as cold liquid or be captured by mitigation systems. The immediate vapour-equivalent fraction is therefore deliberately user-entered rather than hard-coded.

% of exposed liquid mass used for gas-volume / dilution screening.
°C for ideal-gas volume equivalent.
s over which vapour-equivalent source is introduced into the ventilation screen.
% of vapour-equivalent release captured / treated by an approved ARMS or equivalent.

Enclosed / Semi-Enclosed Bunkering Station Ventilation

m³.
m³/h.
% of design airflow for readiness screen.
%.

IMO Detection Thresholds & Toxic-Area Clearance

ppm. MSC.1/Circ.1687 alarm threshold is 110 ppm.
ppm. MSC.1/Circ.1687 safety-system threshold is 220 ppm.
IMO guidance uses detector voting where gas detection causes shutdown.
m. Current IMO minimum around potential ammonia leakage sources on open deck is 10 m.
m from approved dispersion analysis. Enter 0 only if not yet available.
m from bunkering release source.
m. PRV / fuel vent outlet toxic radius is B or 25 m, whichever is less.
m.

Bunkering Time & Topping

minutes.
minutes.
% of planned volume.
% of safe bulk rate.
minutes.

Commercial / Retrofit Inputs

Selected currency/hour.
days.

IMO / 2026 Ammonia Bunkering Readiness

Engineering / toxic-release screening only: This tool is not an approved ammonia bunkering standard, HAZID / HAZOP, QRA, CFD gas-dispersion study, consequence model, emergency-response plan, IGF alternative-design approval, pump curve, transient surge calculation, functional-safety assessment, ERS certification or port authorization. The ventilation model is a deliberately simple well-mixed dilution screen and must not be used to establish a real ammonia toxic plume or personnel exclusion distance. Use class / Administration-approved dispersion and bunkering analyses for the actual vessel and terminal.
2026 reference basis: IMO MSC.1/Circ.1687 provides the interim safety framework for ships using ammonia as fuel. Its bunkering provisions address ammonia-compatible liquid / vapour hoses, dry-disconnect arrangements, ERC / ERS, inert-gas purging, no routine gas discharge during tank filling, bunker-safety-link ESD communication, draining and gas-freeing of bunkering lines. It sets bunker-station ammonia alarm and safety-system actions at 110 ppm and 220 ppm respectively and calls for gas-dispersion analysis showing concentrations above 220 ppm do not reach protected non-toxic openings / spaces. Open-deck toxic-area minima include 10 m around flanges, valves and other potential ammonia release sources; tank PRV and other fuel-gas vent outlets use B or 25 m, whichever is less, subject to approved dispersion analysis. NIOSH occupational references shown by this tool are separate from IMO control thresholds: 25 ppm TWA, 35 ppm short-term limit and 300 ppm IDLH. ISO/AWI 26201, Specification for bunkering of ammonia-fuelled vessel, is under development in 2026 and is not represented here as a published standard. STCW.7/Circ.27 provides 2026 interim training guidance for seafarers using ammonia as fuel.
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