Tubing refers to a flexible hose or pipe used in plumbing, irrigation, and other industries. Tubing may be made of polyvinyl chloride (PVC), polyethylene (PE), copper, or other material. Tubing is usually supplied in rolls compared to rigid pipe which is sold in straight lengths called joints or sticks. Tubing is usually measured by its outside diameter, while pipe is usually measured by its inside diameter.
Metal tubing differs from metal pipe in the way it is dimensioned. Tubing is specified by OD and wall thickness, whereas pipe is specified by a non-dimensional nominal pipe size (NPS) and a schedule (SCH). Metal tubing generally has much thinner wall than pipe and can be bent, although both of these depend on the specific application.
Three methods exist for tubing manufacture: seamless, as-welded, and drawng-over-mandrel (DOM).
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Tubing is the string of pipe set inside the well casing, through which the oil or gas is produced.
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