Introduction
Mid-pressure pipe fittings and flanges are critical components in industrial piping systems, ensuring safe and reliable connections across applications such as oil & gas, chemical processing, and power generation. For procurement engineers and EPC buyers, specifying the correct components requires careful attention to pressure ratings, material grades, and applicable standards. This guide provides a practical framework for sourcing mid-pressure flanges and fittings, with a focus on key decision points to avoid costly errors.
Understanding Mid-Pressure Ratings
Mid-pressure fittings typically refer to components rated for Class 150 to Class 600 (or equivalent PN ratings). The most common classes in mid-pressure applications are:
- Class 150 (PN20): Suitable for low-pressure steam, water, and air services.
- Class 300 (PN50): Used in moderate-pressure process lines.
- Class 600 (PN100): For higher pressure and temperature services.
When specifying, always confirm the design pressure and temperature of your system. Flanges and fittings must be selected with a pressure-temperature rating that exceeds the maximum operating conditions. Refer to
