The "American National Standard for steel pipe flanges for waterworks service" is known as AWWA C207. They come in sizes ranging from 4 inches to 144 inches. The acronym AWWA, which stands for "American Water Works Association," is primarily used to refer to all of the significant machinery needed for water utility services.
The awwa c207 flanges are divided into four classes according to their limit of working pressure:
Class B - 86 psi
Class D- 150-175 psi
Class E- 275 psi
Class F- 300 psi
The pressure limits are for custom conditions and temperatures in various water utility services.
The C207 Flange is divided into four pressure classes, with a maximum pressure rating of 300 psi. The wastewater, slurry, plant pipe, and waterworks industries are where the AWWA C207 Flanges are most commonly used. They can be used in accordance with specific needs and come in a variety of faces. Forging, machining, or heat treating are the three methods used to create them.
A specification designed for generally lower pressure applications (300 psi or less), American Water Works Association flanges are the exact opposite of the API flanges and can be found in a variety of assemblies in which temperature is ambient and media is not corrosive. In most cases, this is simply for the transportation of well water and wastewater, but can also be utilized for slurry and plant piping with minimal pressure requirements.
Ring slip-on or blind disc style AWWA C207 steel flanges are typically made of mild carbon steel or a stainless steel variation. They are normally sealed with rubber gaskets and do not have raised faces or ring joints as a result of their intended purpose. They are also growing in popularity with project work for structural steel types that require mating or filling a gap between existing flanges due to their cost and weight in comparison to other flange kinds.
More To offer a standard for carbon steel rings and shutters, the American Water Works Association has produced specification C207 (and formerly, also hubs). The OD and bolt arrangement are identical to those of B16.1 class 125 flanges. Additionally, they will complement B16.47 Series A flanges up to 60" NPS and B16.5 Class 150 flanges up to 24" nominal pipe size. Thickness and the absence of a raised face or hub represent the primary dimensional differences (except in legacy systems).
The types of steel that can be utilized are also a little more forgiving under AWWA. Carbon, phosphorus, and sulfur levels are restricted by C207 to 0.35%, 0.04%, and 0.05 percent, respectively. Several commercially available grades of carbon steel, such as A36, A516-70, A181-60, and A105, are made possible by the reduced minimum yield and tensile strength requirements (32ksi and 50ksi, respectively). The MTRs for every AWWA flange that SSM sells will list the precise physical and chemical characteristics for each heat batch. Send us your request for AWWA Ring or Blind flanges if you require a large flange but do not need to adhere to ASME code.
