What defines a main space onboard?

A main space onboard typically refers to areas that house critical functions and operations essential for the vessel's performance and safety. The presence of flammable liquids and machinery in such spaces is significant, as it underscores the complexity and risk associated with these environments. These spaces often require careful management and strict adherence to safety protocols due to the potential hazards posed by both flammable materials and machinery operations.

In the context of maritime operations, having machinery along with flammable liquids indicates that these spaces are not only operational but also inherently risky and require a specific design and safety standards to mitigate those risks. This definition aligns with the overall understanding of what constitutes a main space, as it encompasses areas integral to the ship’s operation, maintenance, and safety.