Tankers used for transporting oil and petroleum products require regular cleaning of

cargo tanks to maintain their operational performance and comply with environmental

standards. Cleaning tankers from oil is a complex process that involves removing oil

residues, sludge, and contaminants. This procedure is essential to prevent environmental

pollution, ensure the safety of vessel operations, and prepare the tanker for carrying

other cargoes. This article examines the technologies used for tanker cleaning, their

environmental implications, and modern approaches to minimizing environmental

impact.

Tanker Cleaning Technologies

Several methods are used for cleaning tankers, each with its own advantages and

limitations:

• Crude Oil Washing (COW). This method involves using crude oil under high

pressure to dissolve and remove oil residues. COW is effective for removing heavy

fractions but requires strict control to avoid additional emissions.

• Water-based cleaning with chemicals. Special detergents and hot water are

used to remove contaminants. This method is widely used but requires the disposal

of wastewater containing petroleum products and chemicals.

• Steam cleaning. High-pressure steam is used to dissolve and remove oil residues.

This method is effective for light petroleum products but less suitable for heavy

fractions.

• Mechanical cleaning. Scrapers, brushes, and other mechanical devices are used

to remove contaminants. This method is often combined with others to achieve

optimal results.

The choice of method depends on the type of cargo, the tanker’s design, and the environmental

regulations of the port.

Environmental Aspects

Tanker cleaning poses a risk of environmental pollution, as wastewater and residues

contain petroleum products and chemicals. To minimize the impact, the following

measures are implemented:

• Collection and disposal of wastewater. Wastewater is collected in dedicated

tanks and transferred to shore-based treatment facilities, preventing the discharge

of contaminated water into the sea.

• Use of environmentally safe detergents. Modern detergents are designed to

be biodegradable and have minimal impact on marine ecosystems.

• Emission control. The use of filtration and recirculation systems reduces the

release of volatile organic compounds (VOCs) into the atmosphere.

International regulations, such as the MARPOL 73/78 Convention, impose strict requirements

on tanker cleaning, mandating shipowners to use certified technologies and equipment.

Modern Innovations

Modern technologies aim to improve the efficiency and environmental safety of the

cleaning process. Automated cleaning systems equipped with robots and sensors reduce

cleaning time and minimize human involvement. Closed-loop water recirculation systems

decrease the volume of wastewater. Additionally, new tank coating materials are being

developed to reduce oil adhesion and simplify cleaning.

Conclusion

Tanker cleaning from oil is a critical process that ensures the safety of vessel operations

and environmental protection. Modern technologies and stringent environmental standards

help minimize the impact on nature while maintaining high cleaning efficiency. The

continued development of automated and environmentally safe cleaning methods

will contribute to the sustainable development of the maritime industry.