11/13/2022 0 Comments Depriester chart kpa and celsius![]() ![]() finally, a class 2500 flange of the same size bears 34 times more pressure than the class 150 rated flange, reaching a whopping 4730 psi rating at 600 F°!.the class 300 flange (bigger and stronger, but with the same bore size) withstands 570 psi at the same temperature of 600 degrees F°.the class 150 flange withstands just 140 psi at a temperature of 600 degrees F° (as per the rating chart below).Now, let’s look at what this means in terms of pressure rating: This is represented in the picture: Flange Pressure Ratings ![]() If two flanges have the same bore size (example 6 inches), the same material (example A105), but two different pressure ratings (one flange is class 150, the other 300), the lower rated flange (class 150) will be smaller, lighter, and less robust than the higher rated flange (class 300). they all refer to the same exact concept of pressure/temperature performance of a flange (and other equipment like valves, fittings, etc). The terms “pressure rating”, “class”, “#”, “Lb” or “Lbs” are interchangeable, i.e. Pressure rating is defined as the maximum allowed pressure that a flange can withstand at increasing temperatures. According to the ANSI/ASME B16.5 specification, there are seven flange pressure ratings: 150, 300, 400, 600, 900, 1500, and 2500. In the article, you find the pressure rating charts for carbon, alloy, and stainless steel flanges and some guidance about selecting the proper rating for your piping application. Flanges made in different materials show different pressure-temperature performance at the same rating. Flanges with a higher rating (class) are stronger than flanges with lower ratings, as they bear more pressure at increasing temperatures. ![]() The term “flange rating” (or class) refers to the maximum pressure (in psi or bars) that a flange withstands at increasing temperatures. What means ANSI flange pressure rating? How to select the right flange rating? ![]()
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