ASME B36.19M:2018 pdf free download – Stainless Steel Pipe
1 SCOPE
This Standardcovers thestandardizationofdimensions of welded and seamless wrought stainless steel pipe for high or low temperatures and pressures. The word pipe is used, as distinguished from tube, to apply to tubular products of dimensions commonly used for pipeline and piping systems.
2 SIZE
The size of all pipe in Table 2-1 is identified by the dimensionless designator nominal pipe size (NPS) [diamètre nominal (DN)]. Pipes NPS 12 (DN 300) and smaller have outside diameters numerically larger than their corresponding sizes. In contrast, the outside diameters of tubes are numerically identical to the size number for all sizes. The manufacture ofpipe NPS 1 ∕ 8 (DN 6) to NPS 12 (DN 300), inclusive, is based on a standardized outside diameter (O.D.). This O.D. was originally selected so thatpipe with a standard O.D. and having a wall thickness that was typical of the period would have an inside diameter (I.D.) approximately equal to the nominal size. Although there is no such relation between the existing standard thicknesses — O.D. and nominal size — these nominal sizes and standard O.D.s continue in use as “standard.” The manufacture of pipe NPS 14 (DN 350) and larger proceeds on the basis of an O.D. corresponding to the nominal size.
3 MATERIALS
The dimensional standards for pipe described here are for products covered in ASTM specifications.
4 WALL THICKNESS
ThenominalwallthicknessesaregiveninTable2-1.The wallthicknessesforNPS14toNPS22,inclusive(DN350 to DN 550, inclusive), of Schedule 10S; NPS 12 (DN 300) of Schedule 40S; and NPS 10 and NPS 12 (DN 250 and DN 300) of Schedule 80S are not the same as those of ASME B36.10M, Welded and Seamless Wrought Steel Pipe. The suffix “S” in the schedule number is used to differentiate B36.19M pipe from B36.10M pipe. ASME B36.10M includes other pipethicknesses that a realsocom mercially available with stainless steel material.
6 PERMISSIBLE VARIATIONS
Variations in dimensions differ depending upon the method of manufacture employed in making the pipe to the various specifications available. Permissible varia- tions for dimensions are indicated in each specification.
7 PIPE THREADS
Unlessotherwisespecified,thethreadsofthreadedpipe shall conform to ASME B1.20.1, Pipe Threads, General Purpose (Inch). Schedules 5S and 10S wall thicknesses do not permit threading in accordance with ASME B1.20.1.
8 WALL-THICKNESS SELECTION
When the selection ofwall thickness depends primarily upon capacity to resist internal pressure under given conditions, the designer shall compute the exact value of wall thickness suitable for conditions for which the pipe is required, as prescribed in detail in the ASME Boiler and Pressure Vessel Code, ASME B31 Code for Pressure Piping, or other similar code, whichever governs the construction. A thickness shall be selected from the schedules of nominal thickness contained in Table 2-1 to suit the value computed to fulfill the condi- tions for which the pipe is desired.