A Complete Guide to Stainless Steel Pipe Fittings

Understanding the 7 Most Common Types of Stainless Fittings

Stainless steel fittings come in many shapes and sizes, but these seven types are the most widely used in industrial applications:

1. Elbow: Used to change the direction of a pipe run. The most common angles are 90° and 45°.
2. Tee: Used to split a flow into two separate lines or combine two lines into a single main line.
3. Coupling (or Socket): Used to connect two pipes of the same size to extend a straight run.
4. Reducer: Used to connect two pipes of different diameters. They can be concentric (centered) or eccentric (offset).
5. Union: A three-part fitting that allows for the convenient disconnection and reconnection of pipes for future maintenance without cutting the pipe.
6. Flange: Used for connecting large-diameter pipes, valves, or pumps. It creates a strong, bolted connection that can withstand high pressure.
7. Nipple: A short piece of pipe with male threads on both ends, used to connect two female-threaded fittings.

5 Key Principles for Selecting the Right Fitting

To ensure you choose the most suitable and safest fitting, consider these five factors:

• Pipe Size and Type: The fitting must match the diameter and thread standard (e.g., NPT, BSP) of the pipe it's connecting to.
• Fluid Type: What is flowing through the pipe? (Water, air, oil, chemicals). This determines the required stainless steel grade (e.g., 304 or 316) for proper corrosion resistance.
• Pressure Rating: The fitting must be able to withstand the maximum pressure within the system (e.g., Class 150, 3000).
• Temperature Rating: The fitting must be able to operate safely within the temperature range of the fluid.
• Connection Method: How will it be installed? (Welding, threading, compression). This dictates the type of fitting end.