Space and weight constraints

Inland waterway craft, from river barges and push-tugs to passenger ferries and dredgers, operate within tight structural envelopes. Integrating exhaust aftertreatment systems without affecting stability, cargo capacity or passenger space demands careful system architecture from the earliest design stage.

Variable duty cycles

Inland operations involve frequent load transitions: locks, berths, variable currents and stop-start schedules all demand aftertreatment systems that maintain catalytic efficiency across a wide range of exhaust temperatures and engine loads, not just at type-approval conditions.

Engine marinisation and integration

Engine marinisers adapting industrial or on-road engines for inland waterway propulsion face the challenge of matching aftertreatment to non-standard exhaust configurations, reductant storage, and the corrosive marine environment, all within a certifiable, type-approvable package.

Type approval and certification

Demonstrating compliance with propulsion and auxiliary emission categories requires validated test data, recognised approval routes, and supply chain documentation that satisfies both EU type-approval authorities and, for UK-operating vessels, the relevant domestic regime.

Retrofit and repower complexity

Boat builders and operators bringing existing or low volume new-build vessels into compliance face compounding challenges: legacy engine interfaces, limited installation access, operational downtime, and the need to demonstrate equivalent emission performance to the standards applicable to new engines.

Supply chain coherence

Sourcing DOC+DPF and SCR, urea dosing and electronic control from separate suppliers increases integration risk, complicates type approval, and frequently produces system performance that is less than the sum of its parts.