In ASME B36.10M, Pipe schedule is identified as Standard (STD), Ex-Standard (XS), or Double Extra Strong(XSS) Or with Schedule No. Since there is no direct relationship between the old standard thickness (O.D.) and Nominal Size, both of them are accepted according to the ASME B 36.10 M standard. However, as the pipe dimensions increase, the O.D. was chosen to specify the pipe dimensions, but since pipes always have a wall thickness and internal diameter (I.D.), the difference between the O.D. Secondly, for NPS 1/8 (DN 6) to NPS 12 (DN 300), these sizes are based on a standard outside diameter (O.D.). Why pipes with sizes smaller than NPS 12 (DN 300) have different ODįirst, we need to acknowledge that all pipe sizes should be identified as nominal pipe size (NPS). In this standard, when the pipe’s Outer Diameter is smaller than 12.75 in (NPS 12, DN 300), the pipe’s actual diameter is larger than NPS (Nominal Pipe Size) or DN (Nominal Diameter).Īs for steel tube dimensions, the actual outside diameter is the same as the pipe number for all sizes. In this case, the pipe is specifically used for pipeline systems and the transmission of fluids such as oil and gas, water, and slurry. The pipe is distinguished from a tube (Pipe vs Tube). The standard covers the standardization of steel pipe dimensions and sizes, including seamless or welded types, which are used in high or low temperatures and pressures. Relevant standard specification ASME B 36.10M and B 36.19Mīoth ASME B36.10 and B36.19 are the standard specifications for the dimensions of the steel pipe and accessories. There are different standards to describe the steel pipe size, OD and wall thickness, which mainly are ASME B 36.10, ASME B 36.19. Pipe Schedule Chart unit in mm as below, view here for Pipe Schedule Chart in inch. So that’s why we always need to know the correct pipe size. Through these elements we could calculate the pipe weight, how much pressure the pipe could bear, and the cost per foot or per meter. Steel Pipe Dimension 3 elementsĪ complete description for steel pipe dimension includes outer diameter (OD), wall thickness (WT), pipe length (Normally 20 ft 6 meter, or 40 ft 12 meters). Means of Nominal Pipe Size (NPS) and Nominal Diameter (DN)Īnd finally, we will tells you how to describe steel pipe dimensions & sizes correctly. Pipe Size Schedule (Schedule 40 & 80 steel pipe means) So, what are the right ways to express the dimensions of a steel pipe?įor your better understanding, we will explain from the following aspects:ĭimension Standards of carbon and stainless steel pipe (ASME B36.10M & B36.19M) Any misunderstandings or the purchase of an incorrect size could lead to significant trouble. People are often confused when it comes to accurately describing the dimensions or sizes of steel pipes, as well as effectively communicating their desired size to the seller.
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