![]() ![]() The larger the flange, the more likely it is to catch on something and cause a blockage. If the flanges on a pipeline are too big, it can cause problems with the flow of the liquid or gas inside. Then divide this measurement by 2 to get the BCD.Ĭredit: What Happens If Flanges are Too Big? To calculate the required bolt circle diameter (BCD), first measure the distance between any two adjacent bolt holes using a ruler or tape measure. The most common classes are 125, 150, and 300. For example, a 4″ weld neck flange with a Class 150 rating would be called a 4″WNFLG150. Once you have identified the type of flange you need, you must then determine the appropriate size.įlange sizes are designated by their nominal bore (the inside diameter of the pipe) and their class (a measure of their pressure rating). Slip-on flanges are less expensive and easier to install, but they are not as strong as welding neck flanges. They have a tapered hub that welds to the pipe, providing extra reinforcement at the point of connection. Welding neck flanges are typically used in high pressure applications. There are two common types of flanges: welding neck and slip-on. In order to select the correct size flange for your application, it is important to first identify the type of flange you need. If you are unsure of the size, you can measure the circumference of the pipe with a tape measure and divide by 3.14 to get the diameter. The size of the flange that you need is determined by the diameter of the pipe that it will be attached to.
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