Ballast Water Exchange Contingency Procedure SOP

Standard operating procedure for executing a D-1 sequential or flow-through ballast water exchange as a contingency when the ballast water management system (BWMS) fails, including stability monitoring and Ballast Water Record Book (BWRB) Code F entry.

Steps

• Confirm BWMS failure and contingency trigger
  The officer verifies the BWMS fault indication, records the failure details, and confirms whether the vessel's ballast water management plan allows D-1 contingency exchange. The officer escalates unresolved uncertainty to the Master or Chief Officer before any ballast transfer begins.
• Restore BWMS or escalate for maintenance
  The chief officer verifies whether the BWMS fault can be cleared safely. The officer documents the corrective action taken, or records the maintenance escalation and returns to the contingency decision point if treatment remains unavailable.
• Assess stability and approve the exchange plan
  The competent person verifies the current loading condition, tank sequence, trim, list, shear force, and bending moment against the vessel's approved tolerances. The officer confirms the exchange method, sequence, and maximum allowable deviation before operations proceed.
• Brief the deck and ballast team
  The officer briefs the team on the selected D-1 method, tank order, valve positions, monitoring frequency, alarm response, and stop-work criteria. The officer assigns one person to verify each critical valve movement and one person to monitor stability readings.
• Line up valves and verify tank isolation
  The ballast control operator sets the valves exactly as specified in the approved exchange sequence. The operator verifies tank isolation, suction and discharge paths, and any required cross-connection controls before starting pumps.
• Perform the D-1 exchange in controlled increments
  The operator starts the ballast transfer at the approved rate and follows the sequential or flow-through method specified in the ballast water management plan. The operator monitors tank levels, pump performance, and vessel stability at the required interval and stops the transfer if any deviation exceeds the approved tolerance.
• Monitor stability and verify stop criteria
  The competent person verifies stability readings at the required interval and confirms that the vessel remains within tolerance. The officer records any deviation, determines whether the exchange may continue, and escalates any non-conformance immediately.
• Complete the exchange and secure the system
  The operator stops the ballast pumps, closes the required valves, and verifies that the system is secured against unintended transfer. The officer confirms the final tank condition matches the approved plan.
• Record the contingency exchange in the BWRB
  The officer enters the contingency event in the Ballast Water Record Book, including the BWMS failure reason, exchange method, start and finish times, tank details, stability checks, and any required Code F entry. The officer signs the record and ensures the entry is available for inspection.
• Report non-conformance and close out corrective action
  The chief officer reports the BWMS failure and contingency exchange outcome through the vessel's non-conformance or maintenance process. The officer assigns follow-up actions, including repair, testing, and verification before the next ballast operation.