Steel and stainless steel flange pressure and temperature ratings

Flanges constructed with more metal can withstand more pressure than those constructed with less metal. The pressure capability of a flange is, however, impacted by a number of factors. As part of a piping system, 300 flange pressure rating chart is useful and flanges are used to join pipes, valves, pumps, and other equipment together.

Materials for Flanges

There are many different materials used to manufacture pipe flanges, including stainless steel, cast iron, aluminium, brass, bronze, plastic, etc. but carbon steel has been used most often for forged flanges, in addition to having machined surfaces.

The connection between a steel flange and a fitting is either bolted, welded, or threaded. The ease of cleaning, inspection, or modification of steel flanges makes them ideal for a wide range of applications. A flange is usually round, but it can also be rectangular or square due to the versatility of steel.

What is a steel flange?

It is important to know that the pressure-temperature ratings(ansi 1500 pressure rating) are given by the following classifications, followed by a dimensionless number. Generally speaking, there are four classes: 150, 300, 400, 600, 900, 1500, and 2500.

Pressure Rating Designation

Example of Pressure Rating

The 304 stainless steel pressure rating of a flange decreases with increasing temperatures, but at the same time is capable of withstanding varying pressures. An example would be a Class 150 flange rated to 270 PSIG at ambient temperature, 180 PSIG at 400°F, 150 PSIG at 600°F, and 75 PSIG at 800°F.

Ansi flange temperature pressure Ratings - Example

Depending on the temperature and pressure, pressure 304 stainless temperature ratings indicate the maximum working pressure in bar units. It is permissible to use linear interpolation for intermediate temperatures.