The American Society of Mechanical Engineers /American National Standards Institute (ASME/ANSI) recognized the importance of reliable guidelines and were the first to create a set of performance standards for valves, flanges, and fittings in . The American Water Works Association determined the ANSI/ASME pressure ratings were too conservative when used with water.
Click here to get more.
Through testing, they determined Ductile Iron fittings with dimensions conforming to ANSI/ASME B16.1 Class 125 could be rated at 250 psi. The AWWA C110 applies to Ductile Iron and gray iron flanges and fittings ONLY. If you see a specification that calls out ANSI/ASME B16.1 then you better be careful.
Yes, AMSE B16.1 covers the class 250 flange, but this also covers the Class 125 flange, which has the same facing and drilling pattern as AWWA C110. This standard only refers to the Class 125 flange. The difference in Class 250 Flanges (sometimes referred to as EH-extra heavy) is:
As these standards are designed for cold water service, their pressure ratings are higher than ASME/ANSI ratings for a fitting of similar size and material. These higher ratings are in place because ASME/ANSI fittings are expected to deal with more hazardous service situations such as steam! The Class 250 flange is an ANSI /ASME specification, not an AWWA, and it means the joint can withstand 250 psi at 373 degrees Fahrenheit. Incidentally, you will not find AWWA C110 grey iron fittings being made or sold routinely in the United States.
ASME B16.1 Class 125 / Class 250 is to rule gray iron pipe flanges and flanged fittings. In
Class 125 / Class 250 is to rule gray iron pipe flanges and flanged fittings. In fire fighting valve design and production, valve body is ductile iron material but valve flange could take this standard achieving connection successfully.
With competitive price and timely delivery, Solid sincerely hope to be your supplier and partner.
Flanged as B16.1 Class 125 is widely used in American standard fire valve production and installation.
Note:
1. For flange diameter, it follows table I-9 of ASME B16.1 and are multiplied by 25.4 to get SI unit.
2. For flange thickness, it follows AWWA C515, not as ASME B16.1.
3. For flange facing, it is flat faced and finished in accordance with MSS SP-6.
Compared with B16.1 Class 125, Class 250 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 22.4 127.0 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 1-1/8" 12 7/8" 10" / DN250 / 273.0mm 445 47.8 387.4 1-1/4" 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 1-3/8" 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 1-5/8" 24 1-1/2"Note:
1. For flange diameter and thickness, they follow table I-2 of ASME B16.1 and are multiplied by 25.4 to get SI unit.
2. For flange facing, it is 2 mm (0.06 inch) raised face and finished in accordance with MSS SP-6.
If you are looking for more details, kindly visit Ductile Iron Flange Adapter.