Size Differences between steel pipe and tube

　　Pipe is tube which complied with ASNI B 36.10 and B36.19 (for stainless steel). Its diameter represented with NPS which is different from actual diameters.

　　Pipe wall thickness is indicated by the schedule No. And the same NPS number can have various types of Sch. No. Such as STD, thickened wall thickness (XS) and special thick wall thickness (XXS), and so on.

　　Tubing refers to finished product meet the standard PG-27.2.1 [Outer diameter D≤5in.(127mm)], and which according calculate formula to select diameter, thickness and according the design.

　　Piping usually refers to finished product which calculated by PG-27.2.2 formula to select NPS and Sch. No, and follows the design requirements.

　　Sample of description

　　Nominal diameter is not the real diameter, real diameter is always larger than the nominal diameter. For example the pipe nominal diameter in 4 inch, wall thickness SCH 40, means the pipe real out diameter is 4 1/2 inch (114.3 mm), real wall thickness 0.237 inch (6.02 mm).

　　On the contrary, the tube outer diameters described as real OD, for example tube OD 1” means the real diameter is 1 inch.

　　Meanwhile, the steel pipe applied in the pipeline systems that require large dimensions. Though the pipe size range from 1/2” to 60 inch, in most cases are for the OD above 4 inch. On the other hand, tubes are referred OD below 4 inch, commonly is 1/2 inch, 3/4 inch, 1”, 1 1/2” etc.


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