The process of removing this water is referred to as boiler blowdown. Boiler blowdown can also refer to the discharged water itself. Compensated fuel ballast Certain ballast systems consist of a series of tanks used for fuel storage. To maintain vessel stability, seawater is provided to replace fuel as the fuel is used. A discharge is generated when seawater is forced out of the tank during refueling operations.
Most vessels use seawater to remove heat from vessel systems.
The seawater is then discharged back into the ocean, usually below the waterline. CWA Clean Water Act CWG Coordination Working Group - established for the UNDS rulemaking effort. The CWG evaluates policy issues related to UNDS and ensures that all relevant agencies, interested States, and other stakeholder groups are consulted in the UNDS rulemaking process. It leads Federal Agency, Tribal, State and environmental group consultation and will facilitate resolution of comments on proposed UNDS-related rules. Deck runoff drains directly overboard.