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Fire hose is usually manufactured in a plant that specializes in providing hose products to municipal, industrial, and forestry fire departments. Here is a typical sequence of operations used to manufacture a double jacket, rubber-lined fire hose. [17] Preparing the yarn. There are two different fiber yarns that are woven together to form a ...
The three values chosen for friction loss correspond to, in US units inch water column per 100 feet, 0.01, .03, and 0.1. Note that, in approximation, for a given value of flow volume, a step up in duct size (say from 100mm to 120mm) will reduce the friction loss by a factor of 3.
5-inch (13 cm) flex suction hose with Storz fittings, mounted on an engine. Flexible suction hose (Flex suction or suction hose), not to be confused with hard suction hose in U.S., is a specific type of fire hose used in drafting operations, when a fire engine uses a vacuum to draw water from a portable water tank, pool, or other static water source.
The following hose and coupler combinations are used in U.S. wildland fire fighting. [10] 3 ⁄ 4-inch hose with 3 ⁄ 4-11.5NH ASME threads (Garden Hose Thread) 3 ⁄ 4-inch hose with 3 ⁄ 4-14NPSH ASME threads (USDA 5100-107d specification) 3 ⁄ 4-inch hose with Forestry Coupling (CAN/ULC-S551-13 specification and USDA 5100-192 specification)
Line or hose line a line of hose, referred to by its size i.e. 1"3/4, 1 inch, 2 Inch, 5 inch; Line loss: See friction loss. LODD (line of duty death) The death of a fire fighter while on-duty. Live line: A fire hose under pressure from a pump. Also, an energized electrical line that may cause a hazard to firefighters.
Fire hose used to apply water or other fire fighting agent directly to a fire or burning substance. Typically of 2 + 1 ⁄ 2 inches (64 mm) diameter or less in the United States. Historically 1.5 inch hose was the primary initial attack line but has been supplanted in most of the US by 1.75-inch-diameter (44 mm) hose that carries 175 gallons ...
In this article, the following conventions and definitions are to be understood: The Reynolds number Re is taken to be Re = V D / ν, where V is the mean velocity of fluid flow, D is the pipe diameter, and where ν is the kinematic viscosity μ / ρ, with μ the fluid's Dynamic viscosity, and ρ the fluid's density.
where h f is the head loss due to friction, calculated from: the ratio of the length to diameter of the pipe L/D, the velocity of the flow V, and two empirical factors a and b to account for friction. This equation has been supplanted in modern hydraulics by the Darcy–Weisbach equation, which used it as a starting point.