One should remember that weight of pipe in the ansi pipe size chart is "theoretical" weight and not an actual weight. Weight of pipe is measured in pounds per foot or kilograms per meter. However line pipe is almost always referred by wall thickness whereas OCTG is referred by weight per foot. For standard pipe, pipe schedule is used to designate wall thickness. Wall thickness is also mentioned differently. For a standard pipe, a 4.5" OD pipe will be referred to as 4" NPS however for line pipe and OCTG, it will be referred to as 4.5" only. The industry norm for pipe size also varies between different types of pipe. ![]() Pipe Size ChartĪSME B 36.10 has more details of pipe sizes. Pipe sizes 14 and above are less confusing as a 14 NPS is equal to 14" OD (outer diameter). Generally speaking, a schedule 40 pipe dimension for up to 12 NPS is roughly equal to the ID of the pipe. NPS 1/8 through NPS 12 has an outside diameter that is defined by the ansi pipe sizes. This is confusing for many people new to the piping industry. NPS is dimensionless designator and is an indication of a size but not an actual size. Pipe is generally identified by "Nominal Pipe Size" (NPS), with the wall thickness defined by "Schedule" (SCH). They are used for fences, construction and other misc. This tubing can be round or square and are produced by ERW manufacturing. Structural Tubing: used for support or retention purpose.Mechanical Tubing represent 17% of all tubular goods. Mechanical tubing: used for mechanical and structural application and is produdced by ERW and seamless manufacturing.Pressure tubing are produced using seamless manufacturing. Pressure Tubing: used for industrial and pressure application.OCTG are produced by ERW and Seamless manufacturing. It is used in drilling and completion of Oil and Gas wells. Oil Country Tubular Goods (OCTG): This includes drill pipes, tubing and casing.They represent 21% of all tubular products. They are manufactured to API 5L Specification and are available in X42, X50, X60 etc. Line pipe includes ERW, FW, SAW and DSAW Pipe. ![]() Line Pipe: Used primarily in Oil and Gas Applications.They represent 10% of all tubular products. Standard Pipe: There are three different types of standard metal pipes - welded (ERW Pipe), seamless pipe, and galvanized pipe.Types of Pipes and Tubular Goods There are six types of pipes and tubular goods.
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