A tube , or tubing , is a long hollow cylinder used for moving fluids ( liquids or gases ) or to protect electrical or optical cables and wires.
3-582: A hose is a flexible hollow tube or pipe designed to carry fluids from one location to another, often from a faucet or hydrant. Early hoses were made of leather, although modern hoses are typically made of rubber, canvas, and helically wound wire. Hoses may also be made from plastics such as polyvinyl chloride , polytetrafluoroethylene , and polyethylene terephthalate , or from metals such as stainless steel . Tube (fluid conveyance) The terms " pipe " and "tube" are almost interchangeable, although minor distinctions exist — generally,
6-857: A tube has tighter engineering requirements than a pipe. Both pipe and tube imply a level of rigidity and permanence, whereas a hose is usually portable and flexible. A tube and pipe may be specified by standard pipe size designations, e.g. , nominal pipe size, or by nominal outside or inside diameter and/or wall thickness. The actual dimensions of pipe are usually not the nominal dimensions: A 1-inch pipe will not actually measure 1 inch in either outside or inside diameter, whereas many types of tubing are specified by actual inside diameter, outside diameter, or wall thickness. There are three classes of manufactured tubing: seamless, as-welded or electric resistant welded (ERW), and drawn-over-mandrel (DOM). There are many industry and government standards for pipe and tubing. Many standards exist for tube manufacture; some of
9-405: The most common are as follows: ASTM material specifications generally cover a variety of grades or types that indicate a specific material composition. Some of the most commonly used are: In installations using hydrogen , copper and stainless steel tubing must be factory pre-cleaned (ASTM B 280) and/or certified as instrument grade. This is due to hydrogen's particular propensities: to explode in
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