![]() Due to their thin walls, the smaller “S” sizes can not be threaded together according to ASME code, but must be fusion welded. However stainless steel pipe can also be available in other schedules. Stainless steel pipes are most often available in standard weight sizes (noted by the S designation for example, Sch 10S). Initially thinner pipe schedules 5S and 10S had been created and afterwards other “S” sizes followed later. ![]() Stainless steel pipes, due to less risk of failure due to non-corrosive property, permitted the use of pipes with thinner wall thickness. Today we have a range of wall thicknesses, namely: There have been many revisions and additions to the tables of pipe sizes based on industry use and on standards from API, ASTM, and others. However with the advancement of industrial age and use of pipes in varying pressure and temperature conditions, these three sizes did not fit all applications. Initially there are only three pipe wall thicknesses in use – ![]() For NPS 5 and larger, the Nominal Diameter (DN) is equal to the NPS multiplied by 25. The terms Nominal Bore (NB) and Nominal Diameter (DN) are also frequently used interchangeably with Nominal Pipe Size (NPS). Nominal Bore (NB) is European Designation equivalent to NPS. Increasing the wall thickness of the pipe increases the mechanical strength of the pipe, allowing it to handle higher design pressures. Pipe schedule sets the pipe wall thickness. For example, when we say pipe size is 2 NPS, it refers to all the pipes having 2.375-inch (or 60.3 mm) as outside diameter irrespective of wall thickness and thus the inside diameter. Specific pipe is identified by pipe diameter and another non-dimensional number for wall thickness referred to as the Schedule (SCH). Nominal pipe size refers to only the outside diameter (OD) of a pipe making it somewhat vague. Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures.
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