Flange Ratings

Rating is way of classifying flanges. It denotes allowable Pressure temperature combination and not just pressure ot Temp. 150# CS- A105 flange can stand 260 PSI at 200 Deg.F but only 140PSI at 600 Deg F Hope you get it.

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hello,

Flange rating is Temperature-Pressure rating of flange for each material (not just pressure rating).

Flange rating of any material is decided by taking consideration of Design Pressure ,Design Temperture and Material.

In ASME B 16.5(from flange size upto 24" excluding 22") you will find table for selection of rating for each material.

ASME B 16.47(from flange size 26" to 60")

I just want to share with you an example of Table 2-1.1 of ASME B.16.5. The figures are in bar for 150# and 300# flange

Temp C / 150# / 300#

-29 to 38 /15.9 / 41.4

50/15.6 / 40.6

100 / 14.5/ 37.8

150 13.7 35.9

By referring to the appropriate table in the standards, you will get the maximum allowable working pressure (MAWP) for the flange in interest.

The above example is only for one type of material and other tables refer to other type of materials. So the MAWP is not only a function of temperature but also type of material.