What are casing and tubing?

    Tubing naturally has a smaller diameter than casing pipe, except for the 4 1/2-inch diameter. An outer diameter of 114.3 mm (4 1/2 inches) is considered a threshold and can be either casing or tubing. Anything smaller is called tubing, anything larger is casing.

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Difference between water supply and drainage pipelines and industrial pipelines

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