ANSI / ASME B36.19M(②)

  This Standard for corrosion resistant piping, designated caregorically as stainless, is based on the same principles that formed the background for the develeopment of ANSI/ASME B36.10M, Welded and Seamless Wrought Steel Pipe, and reference is made to this source of information.

1. Scope 

This Standard covers the standardization of dimensions of welded and seamless wrought stainless steel pipe.

The word pipe is used as distinguished from tube to apply to tubular products of dimensions commonly used for pipeline and piping systems. Pipe dimensions of sizes 12 and smaller have outside diameters numerically larger than the corresponding size. In contrast, the outside diameters of tubes are numerically identical to the size number for all sizes.

The wall thicknesses for sizes 14 throught 22 inclusive of Schedule 10S, for size 12 of Schedule 40S, and those of ANSI/ASME B36.10M. The suffix "S" in the Schedule Number is used to differentiate B36.19M pipe from B36.10M pipe. ANSI/ASME B36.10M INcludes other pipe thicknesses which are also commercially available with stainless steel material.

2. Size

The size of all pipe in Tables 2 through 3A is identified by the nominal pipe size.

The manufacture of pipe in the inch nominal sizes of 1/8-12 inclusive is based on a standardized outside diameter (O.D.). This O.D.was originally selected so that pipe with a standard O.D. and having a wall thickness which 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 in nominal sizes of 14 and larger proceeds on the basis of an O.D. and nominal size these nominal sizes and standard O.D.'s continue in use as "standard".

The manufacture of pipe in nominal sizes of 14 and larger proceeds on the basis of an 0.D.corresponding to the nominal size.

3. Materials

The dimensional standards for pipe described here are for products covered in the ASTM Specifications listed in Table 1.

4. Wall thickness

Wariations in dimensions differ depending upon the method of manufacture employed in making the pipe to the various specifications listed in Table 1. Permissible vaariations for dimensions are indicated in each specification.

5. Weights

The nominal weights ' of steel pipe are calculated values and are tabulated in Table 3. The nominal plain end weight, lb/ft, is calculated usig the following formula :

Wpe = 10.68(D - t)t

where
W = nominal plain end weight rounded to the nearest 0.01 lb/ft
D = outside diameter to the nearest 0.001 in. (The symbol D is to be used for O.D. only in mathematical equations or formulas).
t = specified wall thickness rounded to the nearest 0.001 in.
The nominal plain end mass, in kiilograms per meter, is calculated using the following formula :

1The different grades of stainless steel have different specific densities and hence may weigh more or less than the values lised in this table would indicate (see Table 3, General Note (c)).

where
Wpe = nominal plain end weight rounded to the nearest 0.01 kg.m
D = outside diameter to the nearest 0.1 mm for outside diameters which are 16 in. and smaller and to the nearest 1.0 mm for outside diameters larger than 16 in. (The symbol D is to be used for O.D. only in mathematical equations or formulas).
t = specified wall thickness rounded to the nearest 0.01 mm

NOTE : 1 IN. = 25.4 mm; 1 lb/ft = 1.4895 kg/m.

6. Permissible variations

Unless otherwise specified, the threads of threaded pipe shall conform to ANSI/ASME B1.20.1, Pipe Threads, General Purpose (Inch).

Schedules 5S and 10S wall thicknesses do not permit threading in accordance with ANSI/ASME B1.20.1.

7. Pipe threads

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 Boiler and Pressure Vessel Code, ANSI/ASME B31 Code for Pressure Piping, or other similar codes, whichever governs the construction. A thickness will then be selected from the schedules of nominal thickness contained in Tables 2 and 2A to suit the value computed to fulfill the conditions for which the pipe is desired.