๐ช๐ต๐ฎ๐ ๐๐ฟ๐ฒ ๐๐น๐ฎ๐ป๐ด๐ฒ ๐ฅ๐ฎ๐๐ถ๐ป๐ด๐?
Flange ratings indicate the maximum temperatures and pressures that a flange can withstand.
This assures the safety & effectiveness of the pipe system.
Flange ratings are generally classified as classes (e.g., Class 150, 300, 600), with higher classes indicating better pressure & temperature capability.
๐ง๐๐ฝ๐ฒ๐ ๐ผ๐ณ ๐๐น๐ฎ๐ป๐ด๐ฒ ๐๐น๐ฎ๐๐๐ฒ๐
There are 7 commonly used flange classes:
- Class 150: Suitable for low-pressure & temperature systems.
- Class 300: Can withstand higher pressures than Class 150.
- Class 400, 600, 900, 1500, & 2500: Designed to withstand even higher pressures & temperatures, with Class 2500 being the most durable.
๐ฆ๐๐ฎ๐ป๐ฑ๐ฎ๐ฟ๐ฑ๐ถ๐๐ฎ๐๐ถ๐ผ๐ป ๐ผ๐ณ ๐๐น๐ฎ๐ป๐ด๐ฒ๐
Flange ratings are standardised to assure compatibility.
โข ANSI/ASME B16.5: Covers flanges up to 24 inches and pressure ratings from 150 to 2500.
โข ANSI/ASME B16.47: Applies to larger flanges from 26 to 60 inches, with pressure classifications ranging from 75 to 900.
๐จtiliz๐ถ๐ป๐ด ๐ฎ๐๐๐ฎ๐ฐ๐ต๐ฒ๐ฑ ๐๐ฎ๐ฏ๐น๐ฒ ๐ณ๐ผ๐ฟ ๐๐น๐ฎ๐ป๐ด๐ฒ ๐ฆ๐ฒ๐น๐ฒ๐ฐ๐๐ถ๐ผ๐ป
Example-1
If the system operates at 600 psi & 500ยฐF (260ยฐC), a Class 300 flange is suitable because it is rated for 605 psi at 500ยฐF.
Example-2
To handle higher pressures, such as 2000 psi at 600ยฐF, use a Class 900 flange rated at 1705 psi at 600ยฐF.
Always select a flange with a rating that exceeds your systemโs specifications.
Example-3
For a harsh situation of 250 psi at 1000ยฐF, a Class 300 flange will suffice, as it can withstand up to 255 psi.
๐๐ฒ๐ ๐๐ผ๐ป๐๐ถ๐ฑ๐ฒ๐ฟ๐ฎ๐๐ถ๐ผ๐ป๐ ๐ช๐ต๐ฒ๐ป ๐๐ต๐ผ๐ผ๐๐ถ๐ป๐ด ๐ฎ ๐๐น๐ฎ๐ป๐ด๐ฒs
- Pressure & temperature: Adapt the operating conditions to the flange class.
- Material: Ensure that the flange material which is compatible with the fluid it will carry.
- Safety Margins: Always select a flange that exceeds the systemโs maximum operating conditions to ensure safety & durability.