Which type of drainage system drains spaces forward and aft of main machinery compartments?

The type of drainage system that drains spaces forward and aft of main machinery compartments is classified as a secondary drainage system. This type of system is specifically designed to handle water that may accumulate in the vicinity of major machinery, ensuring that vital areas remain dry and do not compromise the operability of the equipment or safety of the vessel.

The primary function of a secondary drainage system is to manage water that can enter the machinery spaces due to activities such as leaks, condensation, or operational processes—thereby maintaining the integrity of the main machinery compartments. Unlike the main drainage system, which generally handles larger volumes of water from more critical areas, the secondary system focuses on areas that support the main systems but do not themselves require the same level of priority.

Understanding the role of the secondary drainage system is crucial for effective ship maintenance and safety, as it helps to prevent water-related issues that could lead to equipment failure or hazardous conditions.