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).
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ANSI/AWWA C207-94: “AWWA Standard for Steel Pipe Flanges for Waterworks Service-Sizes 4 In. Through 144 In.”, and ANSI B16.5-1981: “Pipe Flanges and Flanged Fittings”.
As already described before, the most used flange types acc. to ASME B16.5 are: Welding Neck flange, Slip On flange, Socket Weld flange, Lap Joint flange, Threaded flange and Blind flange.
The lap joint flange is practically identical to a slip-on flange except it has a radius at the intersection of the bore and flange face.
The American National Standards Institute (ANSI) calls for the use of an ANSI flange to be used on specific applications. The ANSI flange is a three-part flange consisting of one flat flange, one flange machined to take a rubber O-ring…
Flange facing is the process of resurfacing flanges by machining new mating surfaces, to ensure a perfect seal when assembled.