Case Study: Coordinating a Complex STS Operation in Indonesian Waters with Zero Incidents

An STS operation leaves little room for coordination gaps because two vessels need to work according to the same operational plan. In this representative operation, Balancia supported the vessels by coordinating local arrangements, service providers, documentation, and communication with the relevant parties. The transfer was completed without incident and both vessels proceeded according to the agreed plan.

The Conditions Before the STS Operation

The operation involved two vessels scheduled to conduct a ship-to-ship transfer in Indonesian waters. Both vessels had different arrival schedules and operational requirements. The transfer also required suitable weather conditions, support craft, mooring arrangements, and other services to be ready at the right time.

The limited time between arrival and departure meant that preparation had to begin before the vessels reached the transfer area. Balancia supported the local coordination while the vessel teams and appointed parties remained responsible for the technical planning and execution of the STS operation.

The Planning Required Before the Vessels Arrived

STS preparation starts with accurate information from both vessels. Vessel particulars, expected arrival times, transfer requirements, and the planned operating area were reviewed with the relevant parties. The availability of support services was also checked against the expected vessel schedule. Any difference between the two ETAs could affect the timing of boats, mooring support, surveyors, or other services. Balancia coordinated these local arrangements and communicated updates between the vessels and the relevant service providers.

The Risk Controls Applied to the Operation

The transfer was planned around the conditions that could affect the safety of the operation. Weather and sea conditions were monitored before the vessels moved into position. The operating area was also considered when confirming the timing of the transfer. The vessels needed to approach and remain alongside under controlled conditions. Mooring arrangements, fenders, transfer equipment, communication systems, and emergency procedures therefore needed to be ready before cargo transfer began. The appointed vessel teams remained responsible for the operational decisions and execution.

The Need for Clear Communication Between Both Vessels

Two vessels working alongside each other require the same operational information. The vessel teams needed to maintain a shared understanding of the approach, mooring sequence, transfer activity, and departure plan. Balancia supported communication between the vessels and local parties when arrangements or timing needed to be updated. This helped ensure that service providers were working from the latest information and that local arrangements remained aligned with the vessel plan.

The Local Arrangements Supporting the Transfer

The STS operation required support beyond the two vessels. Local service providers needed to be coordinated according to the agreed schedule. Documentation also needed to be prepared and followed up where required. Balancia acted as the local coordination point for these arrangements and communicated with the relevant parties. The agency did not direct the STS operation itself. Its role was to support the vessels and appointed parties by keeping local arrangements moving according to the agreed plan.

The Execution of the Transfer

Once both vessels were in position and the required preparations had been completed, the STS operation proceeded according to the agreed sequence. The vessel teams managed the transfer while the appointed personnel monitored the operation. Communication remained active throughout the transfer. Local support arrangements were also kept available in case operational conditions changed. The transfer progressed without a significant deviation from the agreed plan.

The Factors That Supported a Safe Transfer

1. Early Preparation
   Vessel information and local requirements were reviewed before arrival. Supporting services were also arranged ahead of the transfer.
2. Weather Monitoring
   Weather and sea conditions were checked before the vessels moved into position.
3. Clear Responsibilities
   The vessel teams and appointed parties remained responsible for the technical and operational execution. Balancia focused on local coordination and support.
4. Continuous Communication
   Updates were maintained between the vessels, service providers, and relevant local parties throughout the operation.

The Outcome of the Operation

The STS transfer was completed without incident. Both vessels completed the planned transfer and continued with their respective schedules. The supporting arrangements were completed without significant disruption. No major change to the agreed operational plan was required during the transfer. For the shipowner, the result was a controlled operation supported by clear local coordination from preparation through completion.

What the Case Shows About STS Operations in Indonesian Waters

An STS operation depends on several parties working from the same information. The vessels need to coordinate their schedules. Local services need to be available when required. Documentation needs to be ready. Weather conditions need to be suitable. Communication needs to continue throughout the transfer. A gap in one area can affect the rest of the operation. Local agency support helps connect the vessel teams with service providers and relevant local parties without taking over the vessel’s operational responsibilities.

Navigating local anchorage conditions, regional weather patterns, and Indonesian maritime regulations requires a thorough understanding of the local operational environment. While technical readiness is managed on board, combining crew execution with local operational familiarity is what ultimately prevents delays and ensures regulatory compliance. To explore how regional conditions, environmental considerations, and local frameworks impact offshore cargo transfers, read our full guide on the importance of local knowledge in STS transfer operations in Indonesia.

Balancia’s Role During the STS Operation

Balancia provides local support for STS operations in Indonesian waters. The scope can include coordination with service providers, local arrangements, documentation follow-up, schedule communication, and other support required around the transfer. The exact arrangements depend on the vessels, location, cargo activity, schedule, and applicable local requirements. The focus is on providing reliable local coordination while the vessel teams and appointed specialists remain responsible for the technical execution of the STS operation.

Keeping the Operation Controlled From Planning to Completion

A successful STS operation starts before the vessels arrive at the transfer area. Accurate vessel information needs to be available. Supporting services need to be arranged. Local requirements need to be followed. Weather conditions need to be monitored. Communication needs to remain clear. In this representative case, these elements were coordinated before and during the operation. The transfer was completed without incident and both vessels continued according to the agreed plan. For shipowners conducting STS operations in Indonesian waters, strong preparation and reliable local support can help keep the operation controlled from start to finish.

People Also Ask (FAQ)

References

• International Maritime Organization. (2024). Ship-to-ship transfer operations. International Maritime Organization. https://www.imo.org
• International Maritime Organization. (2024). MARPOL Annex I: Prevention of pollution by oil. International Maritime Organization. https://www.imo.org
• International Maritime Organization. (2024). International Safety Management (ISM) Code. International Maritime Organization. https://www.imo.org
• International Chamber of Shipping. (2015). Ship-to-Ship Transfer Guide for Petroleum, Chemicals and Liquefied Gases. International Chamber of Shipping. https://www.ics-shipping.org
• Direktorat Jenderal Perhubungan Laut. (2025). Maritime transportation and port operation regulations in Indonesia. Ministry of Transportation Republic of Indonesia. https://hubla.dephub.go.id