Understanding Exhaust Gas Scrubber Technologies

Exhaust gas scrubbers enable continued use of high-sulphur fuel while meeting 0.10% SOₓ limits. This deep dive compares open-loop, closed-loop, and hybrid scrubbers to help you choose the right solution.

Open-loop scrubbers use seawater alkalinity for wash-water neutralization, requiring minimal chemical addition but restricted in some ports due to discharge regulations.

Closed-loop systems recirculate wash water with sodium hydroxide dosing, capturing contaminants onboard for shore disposal—ideal where direct discharge is banned.

Hybrid Systems & Integration

Carat Maritime’s installation teams handle new builds and retrofits, integrating scrubber skid modules, wash-water treatment, and PLC controls into your existing exhaust trunking.

We carry out commissioning tests—pH monitoring, particulate sampling, and efficiency trials—to secure Class approval and port-state control acceptance.

Investing in the right scrubber pays for itself through fuel-cost savings and compliance certainty—key for long-term voyage planning.