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Hose barb fittings are small curved, bent or T-shaped pipes, hoses or tubes with hose barbs on at least one side used to join two or more pieces of piping (hosing, tubing) together. [1] Hose barbs are commonly used in the agriculture industry to connect anhydrous ammonia (NH 3) hoses. [2]
A barb (or hose barb), which connects flexible hose or tubing to pipes, typically has a male-threaded end which mates with female threads. The other end of the fitting has a single- or multi-barbed tube—a long tapered cone with ridges, which is inserted into a flexible hose.
In 1959 [8] Hozelock Ltd in the United Kingdom invented and patented the international standard plastic, click-on style, push-fit hose end connector now used with garden hoses. The concept was developed to replace metal hose end connectors in coal mines, which were prone to cause static sparks and the possibility of methane gas explosions.
The letter codes are the common designations, while the roman numeral codes come from the GSA CID A-A-59326 [3] standard: Type A or Type I: adapter (male end) with female thread, e.g. BSP or NPT; Type B or Type VII: coupler (female end) with male thread, e.g. BSP or NPT; Type C or Type VI: coupler with shank (hose barb)
The other goal of a hose clamp is to provide mechanical attachment keeping the hose attached to a barb, hose nipple, or tube. To do this the clamp is typically placed on the hose behind the first ramp of the barb or behind the raised area near the end of and completely around the circumference of the hose nipple or tube called a bead.
A special clip may be placed around the mated hose to prevent it from slipping off the connector. A number of brands, including Quickfit, have begun using threaded connections for hose barbs. This allows the barb to be unscrewed from the glassware, the hose pushed on and the setup screwed back together.