Hey there! I’m a supplier of slip-on pipe flanges, and today I wanna chat about the common sizes of these flanges. Slip-on pipe flanges are super popular in the piping industry, and knowing the right sizes is crucial for a successful project. Slip-on Pipe Flanges

Let’s start with the basics. Slip-on pipe flanges come in a wide range of sizes to fit different pipe diameters and applications. The most common sizes are based on the nominal pipe size (NPS), which is a standard used in the United States and other countries. The NPS is a dimensionless number that represents the approximate inside diameter of the pipe.
For smaller pipes, you’ll often find slip-on flanges in sizes like 1/2", 3/4", 1", 1-1/4", 1-1/2", and 2". These sizes are commonly used in residential and small commercial plumbing systems, as well as in some industrial applications where the flow rate is relatively low.
As the pipe size increases, so do the flange sizes. Medium-sized pipes typically use flanges in sizes like 3", 4", 6", 8", and 10". These sizes are commonly used in larger commercial and industrial plumbing systems, as well as in oil and gas pipelines.
For really large pipes, you’ll need even bigger flanges. Sizes like 12", 14", 16", 18", 20", and up are used in heavy industrial applications, such as power plants, refineries, and chemical plants. These flanges are designed to handle high pressures and large flow rates.
Now, let’s talk about the different standards that govern the sizes of slip-on pipe flanges. The most widely used standards are the American National Standards Institute (ANSI) and the International Organization for Standardization (ISO). These standards ensure that the flanges are compatible with each other and with the pipes they are connected to.
ANSI flanges are commonly used in the United States and other countries that follow the American standard. They are available in different pressure ratings, such as 150#, 300#, 600#, 900#, 1500#, and 2500#. The higher the pressure rating, the thicker and stronger the flange needs to be.
ISO flanges, on the other hand, are used in many countries around the world, especially in Europe and Asia. They are also available in different pressure ratings, but the numbering system is different from ANSI. For example, ISO flanges are rated in PN (pressure nominal) values, such as PN10, PN16, PN25, PN40, etc.
When choosing the right size of slip-on pipe flange for your project, it’s important to consider several factors. First, you need to know the diameter and wall thickness of the pipe you are using. This will determine the size of the flange that will fit properly. Second, you need to consider the pressure and temperature requirements of your system. This will determine the pressure rating of the flange you need.
Another important factor to consider is the type of fluid or gas that will be flowing through the pipe. Some fluids or gases may be corrosive or abrasive, which means you need to choose a flange that is made of a material that can withstand these conditions. For example, if you are working with a corrosive fluid, you may need to choose a flange that is made of stainless steel or another corrosion-resistant material.
In addition to the size and pressure rating, you also need to consider the type of connection you will be using. Slip-on flanges are typically connected to the pipe using bolts and gaskets. The type of gasket you use will depend on the pressure and temperature requirements of your system, as well as the type of fluid or gas that will be flowing through the pipe.
So, there you have it! These are the common sizes of slip-on pipe flanges and the factors you need to consider when choosing the right one for your project. If you have any questions or need help choosing the right flange for your application, don’t hesitate to reach out. I’m here to help!

If you’re interested in purchasing slip-on pipe flanges, I’d love to have a chat with you. We can discuss your specific needs and find the perfect flanges for your project. Just drop me a line, and we can start the conversation.
DIN Threaded Flanges References:
- "Pipe Flanges and Flanged Fittings: Mitered, Welded, and Socket – Welded Joints" by the American Society of Mechanical Engineers (ASME)
- "Flanges – Design, Manufacturing, and Testing" by the International Organization for Standardization (ISO)
Shanxi Zhongwei Flange Co., Ltd
As one of the leading slip-on pipe flanges manufacturers and suppliers in China, we warmly welcome you to buy bulk slip-on pipe flanges for sale here from our factory. All customized flanges are with high quality and competitive price.
Address: Zhuangli Industrial Zone, Dingxiang, Shanxi, China
E-mail: lichunyan888888@zwflange.com
WebSite: https://www.sxzwflange.com/