Introduction
Medium and low pressure pipe flanges are essential components in industrial piping systems, serving as connectors between pipes, valves, pumps, and other equipment. Typically rated for ASME Class 150 and Class 300 (or equivalent pressure ratings in other standards), these flanges are widely used in water treatment, HVAC, food processing, petrochemical, and general industrial applications. For procurement engineers and global buyers, selecting the right flange involves more than just matching dimensions. This guide outlines the critical factors to consider, from confirming standards to managing quality risks.
Key Standards to Confirm
When procuring medium and low pressure flanges, the first step is to verify the applicable standards. The most common international standards include:
- ASME B16.5: Covers flanges for pressure classes 150, 300, 400, 600, etc. For medium-low pressure, class 150 and 300 are typical.
- ASME B16.47: For large-diameter flanges (NPS 26 and larger), series A and B.
- EN 1092-1: European standard with pressure designations PN6, PN10, PN16, PN25, PN40, etc.
