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At its annual convention at Dallas, TX, the NFPA formally adopted a standard with 2 + 1 ⁄ 2-inch hose with 7.5 threads per inch as the primary standard, with additional sizes of 3 and 3.5 inches (each with 6 threads per inch) and a 4.5 inch coupling with 4 threads per inch, with the fire hydrant standard specifying one 4.5 inch port and two 2 ...
The coupling design is specified by CAN/ULC-S551-13 (25 mm and 38 mm forged couplers), CAN/ULC-S558-13 (25 mm and 38 mm non-forged couplers), and ULC/CAN-S574 (64 mm forged couplers), as well as USFDA 5100-192 (US Forest Service) and available for use with 19 mm, 25 mm, 38 mm, and 64 mm hose sizes.
The 100 mm (4-inch) and 125 mm (5-inch) Storz couplers have been specified in NFPA 1963, Standard for Fire Hose Connections, since the 1993 edition. U.S. cities that have fire hydrants with 125 mm Storz connectors include Raleigh, NC [ 5 ] and the City of Corvallis, OR (adapter on 4-inch threaded outlet).
Pneumatic tool attached using a coupling. A coupled pair consists of a male nipple or plug and a female coupler or socket. One side is connected to a flexible supply hose; the other may be attached to a manifold, valve, tool, or another hose. A female coupler is used on the supply side, and a male nipple is used on the receiving side.
Supply lines, used to supply firefighting apparatus with water, are frequently found in 3 + 1 ⁄ 2, 4, 4 + 1 ⁄ 2, 5 and 6-inch diameters. There are several systems available for repairing holes in fire hoses, the most common being the Stenor Merlin, which offer patching materials for Type 1, 2, and 3 hoses. The patches come in two different ...
A coupling or coupler is a mechanism, typically located at each end of a rail vehicle, that connects them together to form a train. The equipment that connects the couplers to the vehicles is the draft gear or draw gear, which must absorb the stresses of the coupling and the acceleration of the train.