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Flanged end connection as ASME B16.42 Class 150 / Class 300

ASME B16.42 Class 150 / Class 300 is to rule cast ductile iron pipe flanges and flanged fittings. As fire fighting valve is made of ductile iron, so flanged as B16.42 Class 150 / Class 300 is totally follow this standard from aspect of material.
We could say B16.42 Class 150 / Class 300 is the most standard rule for American fire valve flanges.

Available size of Class 150

Size Flange dimension (mm) Bolting
D C (min) D1 (PCD) D. of bolt hole Bolt no. Bolt size
2" / DN50 / 60.3mm 152 19.1 120.7 3/4" 4 5/8"
2-1/2" / DN65 / 73.0mm 178 22.4 139.7 3/4" 4 5/8"
3" / DN80 / 88.9mm 191 23.9 152.4 3/4" 4 5/8"
4" / DN100 / 114.3mm 229 23.9 190.5 3/4" 8 5/8"
5" / DN125 / 141.3mm 254 23.9 215.9 7/8" 8 3/4"
6" / DN150 / 168.3mm 279 25.4 241.3 7/8" 8 3/4"
8" / DN200 / 219.1mm 343 28.4 298.5 7/8" 8 3/4"
10" / DN250 / 273.0mm 406 30.2 362 1" 12 7/8"
12" / DN300 / 323.8mm 483 31.8 431.8 1" 12 7/8"
14" / DN350 / 355.6mm 533 35.1 476.3 1-1/8" 12 1"
16" / DN400 / 406.4mm 597 36.6 539.8 1-1/8" 16 1"
18" / DN450 / 457mm 635 39.6 577.9 1-1/4" 16 1-1/8"
20" / DN500 / 508mm 699 42.9 635 1-1/4" 20 1-1/8"
24" / DN600 / 610mm 813 47.8 749.3 1-3/8" 20 1-1/4"
Note:
1. For flange diameter and thickness, they follow table I-7 of ASME B16.42 and are multiplied by 25.4 to get SI unit.
2. For flange facing, it is normally flat face, or with a 1.5 mm raised face.

Available size of Class 300

Compared with B16.42 Class 150, Class 300 flange will be bigger and thicker in order to bear bigger pressure.
Size Flange dimension (mm) Bolting
D C (min) D1 (PCD) D. of bolt hole Bolt no. Bolt size
2" / DN50 / 60.3mm 165 22.4 127 3/4" 8 5/8"
2-1/2" / DN65 / 73.0mm 191 25.4 149.2 7/8" 8 3/4"
3" / DN80 / 88.9mm 210 28.4 168.3 7/8" 8 3/4"
4" / DN100 / 114.3mm 254 31.8 200.0 7/8" 8 3/4"
5" / DN125 / 141.3mm 279 35.1 235.0 7/8" 8 3/4"
6" / DN150 / 168.3mm 318 36.6 269.9 7/8" 12 3/4"
8" / DN200 / 219.1mm 381 41.1 330.2 1" 12 7/8"
10" / DN250 / 273.0mm 445 47.8 387.4 1-1/8" 16 1"
12" / DN300 / 323.8mm 521 50.8 450.8 1-1/4" 16 1-1/8"
14" / DN350 / 355.6mm 584 53.8 514.4 1-1/4" 20 1-1/8"
16" / DN400 / 406.4mm 648 57.2 571.5 1-3/8" 20 1-1/4"
18" / DN450 / 457mm 711 60.5 628.6 1-3/8" 24 1-1/4"
20" / DN500 / 508mm 775 63.5 685.8 1-3/8" 24 1-1/4"
24" / DN600 / 610mm 914 69.9 812.8 1-1/2" 24 1-1/2"
Note:
1. For flange diameter and thickness, they follow table I-9 of ASME B16.42 and are multiplied by 25.4 to get SI unit.
2. For flange facing, it is furnished with a 1.5 mm (0.06 inch) raised face.
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