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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 ...
[14] Hard-suction hose comprises multiple layers of rubber and woven fabric encapsulating an internal helix of steel wire. Some very flexible hard-suction hoses use a thin, polyvinyl chloride cover with a polyvinyl chloride plastic helix. Suction hose ranges in nominal inside diameter from 2.5 to 6.0 in (64 to 152 mm).
The US standard was defined by NFPA 1963, "Standard for Fire Hose Connections", [2] then later by ANSI-ASME B1.20.7, [3] which specifies 1 + 1 ⁄ 16 inches (27 mm) diameter straight (non-tapered) thread with a pitch of 11.5 threads per inch (TPI). The female thread is abbreviated FHT (for "female hose thread"), and the male part is abbreviated ...
Norway uses NOR fittings for attack hoses. They come in three sizes: NOR 1 (83 or 84 mm; 2 + 1 ⁄ 2-inch), NOR 2 (65 or 66 mm; 2"), and NOR 3 (50 or 55 mm; 1 + 1 ⁄ 2-inch). NOR 2 is mostly used in the maritime and offshore oil industry.
[18]: 71 The rubber sleeves are typically secured with stainless steel worm drive clamping bands, which compress the rubber to make a tight seal around the pipes and fittings. These pipe clamps are similar to hose clamps , but are heavier-duty and ideally are made completely of stainless steel (including the screw) to provide maximum service life.
Screw clamps are normally used for hoses 1/2 inch diameter and up, with other clamps used for smaller hoses. The first patent for a worm-drive hose clamp was granted to Swedish inventor Knut Edwin Bergström [ se ] in 1896 [ 1 ] Bergström founded “Allmänna Brandredskapsaffären E. Bergström & Co.” in 1896 (ABA) to manufacture these worm ...
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