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Why pipe size smaller to NPS 12 (DN 300) have different ODįirst, we need to admit that all pipe size should be identified as nominal pipe size (NPS).

On the hand, for steel tube dimensions, the actual outside diameter same with pipe number for all sizes. In this standard, the pipe Outer Diameter smaller than 12.75 in (NPS 12, DN 300), pipe actual diameters is larger than NPS (Nominal Pipe Size)or DN (Nominal Diameter). The pipe distinguished from tube (Pipe vs Tube), here the pipe is specially for pipeline systems, fluids (Oil and gas, water, slurry) transmissions. These pipes includes seamless or welded types, and applied in high or low temperature and pressures. The standard covers the standardization of steel pipe dimensions and sizes. Relevant standard specification ASME B 36.10M and B 36.19Mīoth ASME B36.10 and B36.19 are the standard specification for the dimensions of the steel pipe and accessories. There are different standards to describe the steel pipe size, OD and wall thickness.

Pipe Schedule Chart unit in mm as below, view here for Pipe Schedule Chart in inch. Therefore, that’s why we always need to know a right pipe size. Through these characters we could calculate the pipe weight, how much pressure pipe could bear, and the cost per foot or per meter. Steel Pipe Dimension 3 charactersĪ completely 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 exactly right ways to express the steel pipe dimensions?įor your better understanding, we will explain from below aspects:ĭimension Standards of carbon and stainless steel pipe (ASME B36.10M & B36.19M)

In case any misunderstandings or a different size we purchased, that will be a big trouble. People always confused about how to describe steel pipe dimensions (sizes) in correct ways, or how to clarify to seller what exactly pipe size we are going to purchase.