A Companion Flange, also known as a slip-on or plate flange, is a type of flange that slides over the pipe and is welded in place, allowing for a secure connection between pipes or equipment. The flange is designed to “companion” another flange, providing a leak-proof seal when bolted together with gaskets. Companion flanges are widely used in various industries like oil and gas, petrochemical, water treatment, and HVAC systems, especially in low to moderate pressure applications.

Companion Flanges differ from other types primarily in their slip-on design, which allows them to be easily fitted over the end of a pipe and then welded for a secure hold. Unlike weld neck flanges that have a tapered hub for structural reinforcement, Companion Flanges have a flat or slightly raised face, making them suitable for lower-pressure applications where ease of alignment and cost-effectiveness are priorities. This design also makes installation simpler and less time-consuming.

Companion Flanges are versatile and used across various industries for connecting pipes, valves, pumps, and other equipment. They are particularly popular in oil and gas, chemical processing, water treatment, and HVAC systems, where they enable quick assembly and disassembly. Due to their slip-on design, they are commonly chosen for applications that require frequent maintenance or adjustments, as they allow easy realignment and secure connections at low to moderate pressure levels.

Companion Flanges offer several advantages, including ease of installation, cost-efficiency, and flexibility. Their slip-on design simplifies alignment and reduces installation time, making them an economical choice for many industrial applications. They are particularly useful in systems that require frequent maintenance or disassembly, as they can be easily aligned and re-installed. Additionally, they offer a reliable connection at moderate pressures, making them ideal for systems where high-pressure handling is not a primary concern.