ASME B36.19M-2018 pdf free download.Stainless Steel Pipe
This Standard covers the standardization of dimensions 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) [diametre 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 of pipe NPS拍(DN 6] to NPS 12 (DN 300), inclusive, is based on a standardized outside diameter (O.D.).
This O.D. was originally selected so that pipe with a standard 0.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 – 0.D. and nominal size – these nominal sizes and standard 0.D.s continue in use as “standard.”
The manufacture of pipe NPS 14 (DN 350) and larger proceeds on the basis of an 0.D. corresponding to the ominal size.
3 MATERIALS
The dimensional standards for pipe described here are for products covered in ASTM specifications.
4 WALL THICKNESS
The nominal wall thicknesses are given in Table 2-1. The wall thicknesses for NPS 14 to NPS 22, inclusive (DN 350 to DN 550, inclusive), of Schedule 10S; NPS 12 (DN 300) of Schedule 40S; and NPS 10 and NPS 12 (DN 250 and N 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 ncludes other pipe thicknesses that are also commercially available with stainless steel material.
5 WEIGHTS/MASSES
The nominal weights (masses)1of steel pipe are calculated values and are tabulated in Table 2-1.
(q) The nominal plain end weight, in pounds per foot, is calculated using the following formula:
Wpe= 10.69(D – nt
where
D = outside diameter to the nearest 0.001 in. (the symbol D is used for 0.D. only in mathematical equations or formulas)
t = specified wall thickness rounded to the nearest 0.001 in.
Wpe = nominal plain end weight, rounded to the nearest 0.01 lb/ft
(b) The nominal plain end mass, in kilograms per meter, is calculated using the following formula:
Mpe= 0.0246615(D – – Ot
where
D = outside diameter to the nearest 0.1 mm for outside diameters that are 16 in. (406.4 mm)
and smaller, and 1.0 mm for outside diameters larger than 16 in. (406.4 mm) (the symbol D is used for 0.D. only in mathematical equations or formulas)
Mpe = nominal plain end mass, rounded to the nearest .01 kg/m
t = specified wall thickness, rounded to the nearest 0.01 mm
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
Unless otherwise specified, the threads of threaded pipe 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 of wall 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 2 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.ASME B36.19M pdf download.ASME B36.19M pdf free download
