Which flange class has a higher rating than Class 600?

Which flange class has a higher rating than Class 600?

• A. Class 300
• B. Class 150
• C. Class 900
• D. Class 600 Plus

Answer: (C)

Flange class ratings indicate the maximum pressure a flange can safely withstand at a given temperature. As the class number increases, the pressure rating increases. Among standard ratings, 900 is higher than 600, so a flange with a higher class rating can handle higher pressures than one rated 600. The other options either have lower ratings (150 and 300) or are not standard ASME ratings (600 Plus is not a recognized standard). Therefore, the higher standard class rating is the one described, which is 900.

Flange class ratings indicate the maximum pressure a flange can safely withstand at a given temperature. As the class number increases, the pressure rating increases. Among standard ratings, 900 is higher than 600, so a flange with a higher class rating can handle higher pressures than one rated 600. The other options either have lower ratings (150 and 300) or are not standard ASME ratings (600 Plus is not a recognized standard). Therefore, the higher standard class rating is the one described, which is 900.