NPS is the abbreviation of Nominal Pipe Size in English, which is the standard for high and low pressure and high and low temperature pipes in North America. NPS is based on the early IPS system. The IPS system was established to differentiate pipe sizes. These dimensions indicate the approximate inside diameter of the pipe in inches. An IPS 6″ pipe means that the inner diameter of the pipe is approximately 6 inches. Users began to use 2 inches, 4 inches, and 6 inches to call pipes. Early pipes had only one wall thickness for each size, and later called standard walls Thick STD. The outer diameter of the pipe is also standardized. Due to the need to deal with high-pressure fluids due to industrial development, thicker pipes began to be manufactured. Gradually there are thickened pipe XS (or XH), double thickened pipe XXS (or XXH ), but the standard outer diameter of the pipe has not changed. What do the American standard pipe fitting codes NPS and SCH mean? The size of the steel pipe is determined by the following two numbers: NPS size, SCH serial number, and the relationship between the above two data determines the inner diameter of the steel pipe .
Pipe wall thickness SCH English Schedule, as mentioned above, there are only three wall thicknesses for pipes in the IPS era. In March 1927, the American Standards Committee investigated the industry and added a smaller grade between the two grades of pipe wall thickness, that is, using SCH to represent the nominal thickness of the pipe. These thickness grades include: SCH5, 5S, 10, 10S, 20, 30, 40, 40S, 60, 80, 80S, 100, 120, 140, 160, STD, XS and XXS. the
NPS is used to indicate the pipe size, and the number behind it means the standard pipe. For example: the outer diameter of the steel pipe indicated by NPS 6 is uniformly 168.3mm. NPS does not correspond fairly well to pipe ID. NPS 12 and below have outside diameters greater than the inches appended to NPS. NPS 14 and above the outside diameter of the pipe is equal to the number of inches appended to the NPS. For a certain tube, the outer diameter is fixed, the wall thickness increases with the increase of the SCH serial number, and the inner diameter of the tube is determined by the SCH serial number of the tube wall thickness. The size of stainless steel pipe is determined by ASME B16.9 outer diameter and wall thickness series. The wall thickness series of stainless steel pipes are followed by the suffix letter S.
The ISO organization uses DN to indicate the nominal size of the pipe
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Author: Maria
Post time: Aug-15-2023