What is the diameter classification for large diameter hose?

Large diameter hose (LDH) is typically classified as hose with a diameter of 3 inches or greater, with many standards recognizing 4 inches as the more conventional cut-off for what is considered "large" diameter in practical use. The classification is important for understanding the applications, capabilities, and limitations of various hoses used in firefighting and water supply operations.

The most widely accepted standard within the fire service designates hoses that are 3 inches and larger as large diameter hose. This classification helps firefighters and departments to identify appropriate equipment for specific tasks such as water supply for large-scale operations, providing an efficient means to transport large volumes of water quickly. LDH allows for increased flow rates and reduced friction loss over longer distances, which is crucial during significant firefighting efforts. Thus, the designation serves both operational and strategic planning purposes within firefighting contexts.