![]() Stainless steel pipe is most often available in standard weight sizes (noted by the “S” designation, for example “NPS SCH 10S”). The wall thickness associated with a particular schedule depends on the pipe size as can be seen from the charts below for some of the more common sized carbon steel pipes encountered. XXS wall is thicker than SCH 160 from NPS 1/8″ to NPS 6″ inclusive, and SCH 160 is thicker than XXSwall for NPS 8″ and larger. XSis identical to SCH 80 for NPS 1/8 to NPS 8, inclusive. STD is identical to SCH 40 for NPS 1/8 to NPS 10, inclusive. As the schedule number increases, the wall thickness increases, and the actual bore is reduced. wall thickness, affects only the inside diameter. – ASME/ANSI B36.19 Stainless Steel Pipe Does Pipe Schedule Change with Pipe Size?įor all pipe sizes the outside diameter remains relatively constant. – ASME/ANSI B 36.10 Welded and Seamless Wrought Steel Pipe, and ![]() In the oil and gas and related downstream industries the most common standards are Other than the pipe schedule, pipe thickness can also be specified in mm or inches to the value corresponding to that specified in the ASME standard. For a given size and schedule the thickness of the pipe is fixed and defined in the applicable ASME standard. Wall thickness is expressed in “ schedules“, referred to as pipe schedules. Obviously, for pipes containing pressurised fluids the wall thickness, and by implication the pipe’s strength, is important. This critical dimension is referred to as the nominal bore (NB). As the main function of the pipes is to carry fluid under pressure therefore their internal diameter is their critical dimension.
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