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Pipe — a long hollow, often rounded object, an industrial product on the basis of a hollow profile of constant cross section for the wire of liquids, solutions, gas, steam and so on.

Pipes are produced industrially, of metals and alloys, organic materials (plastics, resins), concrete, ceramics, glass, wood, and combinations thereof.

In industrial-scale pipes are used for transportation of different environments, isolation, reinforcement or group of electric wires. Metal pipe is widely used in construction as the structural element (e.g., metal) or mechanics (for example, a shaft — part for transmitting rotation).