So somebody specifying a pipe for a high pressure application will select a bigger number which represents a bigger schedule (wall thickness).Īdditionally, in the case of stainless steel, piping schedules are specified with a letter ‘s’ as a suffix after the number. Two pipes the same diameter may have different schedules, which means they have a different wall thickness. It is not an actual measurement, but a guide number based on a wall thickness formula. Pipe schedule (SCH) is how the wall thickness of a pipe is described. (To convert from NPS 6 to DIN simply multiply the 6 x 25=150. For example the metric equivalent of an NPS 6 pipe (6”) is DN 150. This is the international and European metric method used to describe NPS (or NB).ĭN pipe sizes numbers are therefore different to NPS. ( It is a common way of describing pipe sizes used in the USA). ‘NPS’ is an abbreviation of Nominal Pipe Size, which is a term used as a guideline number defining the diameter of the pipe. So what exactly does NPS mean? Is it the inside diameter, the outside diameter? or the wall thickness? There’s not a huge amount to remember, but you do need to familiarize yourself with the terminology and the underlying methods behind how pipes are classified by manufacturers in the oil and gas sector. If you are new to the world of in-situ machining one of the essential things you must learn is how pipe sizing works.
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