What is the typical internal diameter for deck-mount fuel and holding tank discharge hose?

The typical internal diameter for deck-mount fuel and holding tank discharge hose is indeed 1.5 inches. This diameter is standard because it strikes a balance between providing sufficient flow capacity for the safe and efficient discharge of liquids while also fitting within the constraints of most marine systems.

Using a hose with a 1.5-inch diameter allows for adequate venting and reduces the likelihood of clogging while ensuring that the discharge process adheres to safety and performance criteria established by marine industry standards. These standards are designed to minimize the risks associated with fuel spills and ensure that holding tanks can be efficiently emptied.

Larger diameters could result in unnecessary bulk and added weight on vessels, which could affect performance and handling. Conversely, a smaller diameter would restrict flow rates and could increase the risk of blockages or overflow. Thus, 1.5 inches is the ideal choice for these applications, providing optimal performance and compliance with safety regulations.