Piping components are used to transporting various liquids that can be Flammable, Corrosive, Explosives, Volatile, Reactive and sometime Hazardous to human health that is why selection of proper pipe material is important.
ASME B16.5 is a standard for Pipe Flanges and Flanged Fittings that covers flanges sizes from NPS ½” to 24”. In this standard, flanges are classified based on their pressure-temperature rating which is also known as a flange class.
AWWA flanges refer to pipe flanges based on standard specifications from the American Water Works Association (AWWA).
ASTM A105 is the Standard Specification for Carbon Steel Forgings for Piping and fittings Applications.