Stainless flange fittings are essential components in piping systems that facilitate the connection of pipes, valves, pumps, and other equipment. They come in various types, each serving a specific purpose in the system. Here’s an overview of some common stainless flange fittings:

1. Weld Neck Flanges: These flanges have a long tapered neck (hub) that is welded to the pipe. They provide high structural strength and resistance to deformation under high pressure and temperature conditions. Weld neck flanges are commonly used in high-pressure applications.

2. Slip-On Flanges: Slip-on flanges slide over the pipe and are then welded in place or tightened using bolts. They are relatively easy to install and are suitable for low-pressure applications. Slip-on flanges are commonly used in systems where frequent disassembly is not required.

3. Threaded Flanges: Threaded flanges have internal threads that allow them to be screwed onto the pipe’s external threads. They are used in applications where welding is not practical or not allowed. Threaded flanges are commonly used in low-pressure and non-critical applications.

4. Socket Weld Flanges: Socket weld flanges have a socket-like end that fits over the pipe’s external diameter. The pipe is then welded into the socket for a strong and leak-proof connection. Socket weld flanges are commonly used in small pipe sizes and high-pressure applications.

5. Blind Flanges: Blind flanges are solid plates used to close the end of a pipe, vessel, or valve. They are commonly used for pressure testing, blocking off a pipeline, or providing a blank-off point for future expansions. Blind flanges are available with flat faces or raised faces for sealing purposes.

6. Lap Joint Flanges: Lap joint flanges consist of two separate pieces – a stub end and a loose flange. The stub end is welded to the pipe, while the loose flange slides over the stub end and is bolted in place. Lap joint flanges are commonly used in systems where frequent disassembly is required.

7. Orifice Flanges: Orifice flanges are used for orifice metering of flow rates for measuring the flow rate of liquids and gases. They feature a concentric or eccentric orifice plate that is installed between two flanges. Orifice flanges are commonly used in oil and gas, chemical, and petrochemical industries.

8. Spectacle Blind Flanges: Spectacle blind flanges consist of two metal discs – one solid disc and one with a hole (orifice). They are used to isolate sections of a piping system for maintenance or repair purposes. By rotating the spectacle blind, the opening can be closed off or opened as needed.

Stainless flange fittings are available in various sizes, pressure ratings, and materials to suit different piping system requirements. When selecting stainless flange fittings for a specific application, factors such as the operating conditions, pressure and temperature requirements, material compatibility, and applicable standards should be carefully considered to ensure proper performance and reliability.