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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.
V is velocity (in ft/s for US customary units, in m/s for SI units) k is a conversion factor for the unit system (k = 1.318 for US customary units, k = 0.849 for SI units) C is a roughness coefficient; R is the hydraulic radius (in ft for US customary units, in m for SI units) S is the slope of the energy line (head loss per length of pipe or h ...
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)
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 ...
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In laminar flow, friction loss arises from the transfer of momentum from the fluid in the center of the flow to the pipe wall via the viscosity of the fluid; no vortices are present in the flow. Note that the friction loss is insensitive to the pipe roughness height ε: the flow velocity in the neighborhood of the pipe wall is zero.
Hydraulic radius, (m, ft) – For fluid-filled, circular conduits, = D/4 = (inside diameter)/4 Note: Some sources use a constant of 3.71 in the denominator for the roughness term in the first equation above.
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