AUS 40 for NOx Reduction on Cruise Ships in Vietnamese Waters – A Mandatory Solution under IMO Tier III

AUS 40 by Viet Duc Joint Stock Company – Quality Controlled by SGS

Reducing NOx emissions on cruise ships has entered a mandatory phase as IMO Tier III regulations are increasingly enforced. Cruise vessels operating in or passing through emission control areas must comply with strict NOx limits through advanced exhaust treatment solutions. Among these, AUS 40 is considered a key solution for Selective Catalytic Reduction (SCR) systems, ensuring high and stable NOx conversion efficiency.

Viet Duc Joint Stock Company supplies Marine Grade AUS 40 that meets stringent quality standards. The product is manufactured domestically and independently quality-controlled by SGS – a leading global inspection organization. It is specifically developed for the needs of cruise fleets in Vietnam, including cruise liners, international passenger ships, yachts, and charter vessels.

IMO Tier III Context and Mandatory Requirements for Cruise Ships

IMO Tier III sets NOx emission limits approximately 75% lower than Tier II, requiring new cruise ships or vessels operating in emission control areas to implement high-efficiency NOx reduction solutions. SCR systems have become the standard choice for most cruise ships equipped with medium- and high-speed diesel engines due to their superior NOx reduction performance across a wide power range.

The effectiveness of SCR systems depends directly on the urea solution used. AUS 40 is a critical component that ensures NOx conversion efficiency of up to 80–90%, while maintaining catalyst durability and operational stability.

The Role of AUS 40 in NOx Reduction

AUS 40 is a marine-grade urea solution with a 40% concentration, specifically designed for marine engines. When injected into hot exhaust gas, the urea decomposes to produce ammonia. This ammonia acts as a reducing agent, reacting with NOx in the SCR catalyst to convert it into nitrogen and water vapor.

Optimal system performance is only achieved when the urea solution has high purity, free from heavy metals and impurities that could poison the catalyst. AUS 40 from Viet Duc Joint Stock Company meets these requirements through strictly controlled production processes and independent verification by SGS.

AUS 40 by Viet Duc Joint Stock Company – Designed for the Marine Market

The AUS 40 product from Viet Duc Joint Stock Company is developed to meet Marine Grade standards and align with the requirements of leading SCR system manufacturers. The production process is carried out in a closed-loop system, using multi-stage deionized water and high-purity urea to maintain extremely low impurity levels.

Key advantages of AUS 40 include:

• Stable urea concentration within specified standards.

• High purity, minimizing harmful impurities that affect catalysts.

• Extremely low insoluble solids to reduce the risk of clogging in pipelines and injectors.

• High compatibility with materials used in pumps and piping systems.

SGS – Independent Quality Assurance

Each batch of AUS 40 is tested by SGS to ensure full compliance with Marine Grade standards. SGS analysis reports provide accurate data on urea concentration, conductivity, inorganic impurities, biuret content, and metal levels.

This independent verification ensures that the product is fully suitable for SCR systems on international cruise ships calling at Vietnamese ports, giving customers confidence in both quality and compliance.

Suitability for Cruise Ships in Vietnam

AUS 40 from Viet Duc Joint Stock Company offers multiple benefits for cruise fleets operating in Vietnam:

• Maintains high NOx reduction efficiency to meet IMO Tier III requirements.

• Minimizes operational risks, especially in Vietnam’s hot and humid tropical environment.

• Ensures stability during storage and transportation, compatible with onboard tank and piping systems.

• Enables shipowners to secure a reliable domestic supply without depending on imports.

Flexible Supply Solutions at Vietnamese Ports

Viet Duc Joint Stock Company supports AUS 40 supply for cruise ships at major Vietnamese ports such as Ha Long, Hai Phong, Da Nang, Nha Trang, Phu My, and Ho Chi Minh City. Customers can choose IBC packaging or direct bulk transfer into storage tanks depending on consumption needs.

Each shipment is accompanied by an SGS-certified Certificate of Analysis (COA), ensuring transparency and compliance with international standards.

Conclusion

AUS 40 plays a critical role in reducing NOx emissions and meeting IMO Tier III standards for cruise ships operating in Vietnam. AUS 40 produced by Viet Duc Joint Stock Company, with quality assurance from SGS, provides a reliable and efficient solution for shipowners, cruise operators, and maritime passenger transport businesses.