ANSI ASME B16.5 FLANGE DESCRIPTIONS

ANSI ASME B16.5 is a standard that specifies the dimensions and tolerances of pipe flanges and flanged fittings. The standard is divided into several classes, each with its own unique characteristics. The main classes are:

Class 150: These flanges are designed for use with low-pressure systems, such as those used in HVAC and plumbing applications. They have a pressure rating of 150 pounds per square inch (psi) and are typically made of cast iron or carbon steel.

Class 300: These flanges are designed for use with medium-pressure systems, such as those used in the oil and gas industry. They have a pressure rating of 300 psi and are typically made of carbon steel or stainless steel.

Class 600: These flanges are designed for use with high-pressure systems, such as those used in the power generation industry. They have a pressure rating of 600 psi and are typically made of alloy steel or stainless steel.

Class 900: These flanges are designed for use with extremely high-pressure systems, such as those used in the petrochemical industry. They have a pressure rating of 900 psi and are typically made of alloy steel or stainless steel.

Class 1500: These flanges are designed for use with ultra-high-pressure systems, such as those used in the nuclear power industry. They have a pressure rating of 1500 psi and are typically made of alloy steel or stainless steel.

The main difference between the classes of flanges is the pressure rating. Each class is designed to withstand a certain amount of pressure, with Class 150 flanges being suitable for low-pressure systems and Class 1500 flanges being suitable for ultra-high-pressure systems. The materials used to manufacture the flanges also vary depending on the class, with lower classes typically made of cast iron or carbon steel, and higher classes made of alloy steel or stainless steel.

Another difference is the thickness of the flanges, the higher the class the thicker the flange. This is because the flanges are designed to handle more pressure, so they need to be stronger and more durable.

In conclusion, ANSI ASME B16.5 is a standard that specifies the dimensions and tolerances of pipe flanges and flanged fittings. The standard is divided into several classes, with each class having its own unique characteristics, including pressure rating, thickness, and materials used. It is important to use the appropriate class of flange for a specific application to ensure safety and proper functioning.