Underwater Hull Cleaning in Indonesia: Best Practices and Compliance for Ship Owners

Executing an underwater hull cleaning within the Indonesian archipelago requires strict alignment with national and regional environmental frameworks. For a global ship owner, maintaining a biofouling-free vessel is essential for fuel optimization, yet it cannot come at the cost of legal liabilities. Ensuring that your subsea maintenance vendors comply entirely with localized port regulations is the single most critical step to prevent heavy administrative fines, asset detentions, and unexpected voyage delays.

The Importance of Planning Before Cleaning

Vessels operating in Indonesian waters often require underwater hull cleaning to remove biofouling that can impact operational efficiency. Ports and anchorages, including Batam, Tanjung Priok, Surabaya, and eastern Indonesia, have varying rules and access requirements for underwater operations.

Proper planning ensures that the cleaning is conducted in permitted areas, environmental safeguards are respected, and divers can operate safely. Coordination between the ship agency, port authorities, and the diving team is key to avoiding violations and ensuring efficient operations.

Regulatory and Environmental Compliance

Environmental compliance is a critical part of underwater hull cleaning. Biofouling can transport invasive species between regions, and cleaning operations may release removed material into the water.

The IMO 2025 guidance on in-water cleaning recommends capturing waste wherever possible and limiting cleaning in sensitive areas. Agencies should confirm:

• If cleaning is allowed at the vessel’s current location
• The method of cleaning, considering fouling levels and coating type
• Coordination with port authorities and environmental regulators
• Diver adherence to safety and environmental protocols
• Detailed photo or video completion reports

Following these steps ensures legal compliance and protects the marine environment.

Steps for Safe and Effective Cleaning

1. Confirm Vessel Position and Access – Determine whether the vessel is at berth, anchorage, or shipyard, and check local restrictions.
2. Define Cleaning Scope – Decide whether cleaning includes the hull only or extends to propeller polishing, sea chest, rudder, or niche areas.
3. Verify Permits and Approvals – Coordinate with local authorities and ports to secure any required clearance.
4. Select Qualified Diving Teams – Ensure divers are certified and experienced with the vessel type and local conditions.
5. Check Safety and Environmental Controls – Assess currents, visibility, vessel stability, and waste capture procedures.
6. Arrange Logistics – Plan access via launch boats or shipyard cranes and coordinate crew movement as needed.
7. Document Completion – Require photos, videos, and written confirmation of work performed.

Agency Selection Checklist

What to Verify	Questions to Ask the Agency
Location and Permissions	Can cleaning be performed at this berth, anchorage, or shipyard?
Cleaning Scope	Which areas will be cleaned, and which methods will be used?
Diving Team	Are the divers certified and experienced with the vessel type?
Environmental Measures	How will biofouling and coating residues be managed?
Safety Checks	Are currents, visibility, and vessel stability considered?
Reporting	Will photos, videos, and diver notes be provided?
Cost Clarity	Are mobilization, standby, and additional charges clearly outlined?

This helps shipowners ensure the agency has a structured plan and not just a basic contact for divers.

Permits and Timeline Considerations

Approval timelines for underwater hull cleaning vary depending on the vessel’s location, port authority requirements, and the scope of the work. Some operations can be arranged quickly, while others require several days of coordination to secure the necessary permissions.

For vessels with limited port time, early planning is essential. Confirming diver availability, launch boat access, and equipment readiness ahead of time reduces the chance of last-minute changes or operational constraints.

A clear schedule ensures that the cleaning is carried out efficiently and safely. Properly planned timelines also minimize the risk of non-compliance and unexpected costs, keeping the operation smooth from start to finish.

Documents and Information to Provide

Shipowners should prepare the following information before arranging cleaning:

• Vessel name, IMO number, and particulars
• Latest position and draft
• Required service date and priority areas
• Hull coating details and fouling photos, if available
• Onboard safety contact
• Preferred reporting format

The more complete the information, the faster the agency can verify feasibility and compliance.

Preventing Port Violations

Port violations may occur if cleaning is attempted without checking local regulations or environmental rules. Different ports or anchorages may have specific requirements for access, working areas, and environmental safeguards.

Shipowners should ensure the agency coordinates with the authorities and confirms that cleaning is allowed at the vessel’s current location. The diving team must strictly follow the approved scope, avoiding any work that has not been authorized.

Providing documented evidence, including photos, videos, and signed reports, demonstrates compliance. This protects the vessel and owner from fines or regulatory issues while maintaining operational transparency.

Balancia Ship Agency Support

Balancia Ship Agency supports shipowners and operators in planning and executing underwater hull cleaning across Indonesia. The agency manages feasibility checks, coordinates with local authorities, and arranges certified diving teams tailored to each vessel and cleaning scope.

Safety, environmental compliance, and access logistics are fully managed, while detailed completion reports, including photos and notes, are provided. This ensures that the cleaning operation is efficient, safe, and compliant with all regulations.

People Also Ask

References

• Biofouling. (n.d.). International Maritime Organization. https://www.imo.org/en/ourwork/environment/pages/biofouling.aspx
• MEPC.1/Circ.918 Guidance on In-Water Cleaning of Ships’ Biofouling. (2025, April 29). International Maritime Organization. https://wwwcdn.imo.org/localresources/en/OurWork/Environment/Documents/Biofouling%20pages/MEPC.1-Circ.918%20-%20Guidance%20On%20In-Water%20Cleaning%20Of%20Ships%27%20Biofouling%20%28Secretariat%29.pdf
• Badan Pengelolaan dan Pengusahaan Kepelabuhanan. (n.d.). BP Batam. https://batamport.bpbatam.go.id/
• Terminal Umum Batu Ampar. (n.d.). BP Batam. https://batamport.bpbatam.go.id/terminal-umum-batu-ampar/