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A comprehensive analysis of what flanges are and their role in industrial pipelines, focusing on how to convert flange sizes based on NPS and OD to help users make scientific selections.
Flange is an important connector for connecting pipes, valves, equipment, etc. Its function is to form a sealing surface through bolt connection to ensure the sealing and stability of the fluid delivery system. It is an indispensable component in industrial pipeline systems and is widely used in petroleum, chemical, electric power, shipbuilding and other fields.
The size of the flange is usually composed of two parameters: **nominal diameter (NPS) and outer diameter (OD). Many engineers are often confused about the relationship between NPS and OD when selecting flanges. In fact, the two are not simply corresponding.
NPS (Nominal Pipe Size) is the "nominal diameter" of the North American standard, which is not the actual outer diameter of the pipe. For example:
The actual outer diameter of NPS 1" (1 inch) is 33.4mm;
The actual outer diameter of NPS 2" is 60.3mm;
The actual outer diameter of NPS 4" is 114.3mm.
As the diameter increases, the gap between NPS and OD gradually widens. Therefore, when selecting a flange, you cannot simply judge the size by "1 inch", but refer to the corresponding outer diameter given in the standard table to ensure that the flange matches the pipe.
Common flange standards such as ASME B16.5, EN 1092-1, etc., will provide detailed NPS and OD Comparison table. In actual projects, you can also use dimension conversion tools or manuals for quick reference and conversion to avoid installation failure or leakage risks due to dimensional errors.
MTSCO focuses on the manufacture of stainless steel piping systems, supports multiple standards such as ASME and EN, and covers materials such as austenitic stainless steel, duplex steel, nickel alloy, etc. With a complete quality management system and professional technical support, MTSCO provides reliable industrial connection solutions to customers around the world.
