Several governing flange specification exist for a wide variety of industrial steel flanges, and each have their own suitability for our customers’ applications. Here at Texas Flange, our most popular product lines include ASME/ANSI flanges, API flanges, AWWA flanges, and DIN flanges. Lets dive a bit deeper below.
ANSI/ASME flanges – B16.5 and B16.47
The current ANSI/ASME flange specifications, B16.5 and B16.47, trace their roots to the B16.1 specification, which consisted primarily of cast iron. This specification in turn evolved from the original AESC/ASA committee B16 in the 1920s. Modern flange specifications are the result of countless hours of engineering to form a worldwide standard. ANSI/ASME flanges continue to be the most widely used type of steel flange across various industries. The pressure vessel sector often use these to retain and transport air, water, and a variety of other chemicals. ANSI/ASME flanges are often used in refineries; primarily serving as a connection between piping or valves. The 150# class of steel flanges is the most popular for low pressure and vacuum applications, as the design has proven to be effective in applications which require an occasional fluctuation in the temperature and pressure of the environment.
API flanges – 6B and 6BX
A standard developed for the American Petroleum Institute, the API 6A specification shares many characteristics with ANSI/ASME flanges. Despite being dimensionally similar, their minimal design requirements for operating pressure begin in the 2000# class. Certain jobs require the use of pressure classes as high as the 6BX 25000#, though this is much less common than the typical 6B range of 5000# and below. All API flanges require ring type joint facings with the proper gaskets for optimal integrity of their application. This higher-pressure base requirement is due to their overwhelmingly popular use in petrochemical / oilfield applications of a volatile nature. Upstream assemblies with API flanges consist of wellheads, drilling equipment, and much more. The downstream sectors of refinery and processing also require these flanges for the development of crude oil into products for the everyday consumer.
AWWA flanges – C207
American Water Works Association flanges are designed for generally lower pressure applications (300 psi or less). They are the exact opposite of API flanges. This flange specification is best for applications in which temperature is ambient and media is not corrosive. In most cases, this is simply for the transportation of well water and waste water. AWWA C207 steel flanges are usually of a mild carbon steel or stainless variant and are most often either of the ring slip on or blind disc style. Due to their intended design, they do not feature ring joint or raised faces, and typically seal with rubber gaskets. Due to their cost and weight compared to other flange types, they are also becoming more popular with project work for structural steel types which require mating or filling a gap between existing flanges.
Across the pond, you will find the Deutsches Institute fur Normung (DIN) flange specification. DIN consists of a variety of European styles which have been unified into one code for the purpose of commonality. Although much less common than ANSI/ASME steel flanges in the United States, many of our international customers request flanges to these specifications for a variety of applications such as imported steel vessels, cargo ships, and other infrastructure which may consist of metric pipes/valves and European designed equipment. The subset flanges under the DIN standard consist of the most commonly used slip on, weld neck, and blind flanges. Adapter flanges can be custom made to end user requirements for the mating of American flanges to international ones, if requested. However, a common alternative solution is to provide DIN flanges to mate to existing equipment.
Although the most popular, Texas Flange provides more than just these flange types. Other specifications include JIS, BSPP, and a variety of other international styles.
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