Class 1 (Chief Engineer) Engineering Management 📅 Feb 2021

Exam Question

Referring generally to a Ballast Water Treatment (BWT) System, explain:

(a) Requirements related to construction and technical performance.

(b) Requirements related to onboard installation of the system.

Reference Answer

### (a) Requirements Related to Construction and Technical Performance
A Ballast Water Treatment System (BWTS) must be constructed and certified to meet stringent technical performance standards to ensure compliance with the IMO's D-2 standard for ballast water discharge. These requirements are verified during the Type Approval process.
* **Treatment Rated Capacity (TRC):** The TRC is the maximum flow rate of ballast water, specified in cubic meters per hour (m³/hr), that the system is designed to treat. This capacity must be aligned with the ship's ballast pump capacity to ensure that ballasting operations are not delayed. The TRC must be sufficient to manage the ship's normal ballasting and de-ballasting rates effectively.
* **Operational Range:** The system must demonstrate effective treatment across its entire operational range. This includes:

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