NH₃ (Ammonia) Slip

Unburned ammonia from NH₃-fuelled engines. Ammonia is toxic and forms secondary PM; slip management is the headline safety challenge for ammonia marine propulsion.

PollutantsAmmonia fuel

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This calculator requires JavaScript to compute its result. The formula, symbols, and regulatory sources are shown in the Formula section below.

Formula, assumptions, and limits

m_{\text{NH}_3} = \frac{P \cdot h \cdot S_\text{NH3}}{10^6}

Symbol	Meaning	Unit
$m_{\text{NH}_3}$	Annual ammonia slip mass	t
$P$	Engine power	kW
$h$	Annual hours	h
$S_\text{NH3}$	NH₃ slip rate	g/kWh

Source: IMO CCC Sub-Committee - ammonia fuel safety

In short

Estimate unburned ammonia slip from NH₃-fuelled marine engines.

Learn the theory Engine Performance Monitoring: PMI Systems