Introduction
Medium and low pressure flanges are critical components in piping systems for industries such as oil & gas, chemical, petrochemical, and power generation. They serve as the primary connection method between pipes, valves, and equipment, ensuring system integrity and leak-free operation. For procurement engineers, selecting the right flange involves more than just matching dimensions; it requires a thorough understanding of applicable standards, material specifications, and quality assurance processes.
Standards to Confirm
When procuring medium and low pressure flanges, the first step is to confirm the governing design standard. The most common international standards are:
- ASME B16.5: Covers pipe flanges and flanged fittings for pressure classes 150, 300, 400, 600, 900, 1500, and 2500. For medium/low pressure, classes 150 and 300 are typical.
- EN 1092-1: European standard for circular flanges, with pressure designations PN 2.5 to PN 40.
- JIS B2220: Japanese standard for steel pipe flanges, with pressure ratings from 5K to 30K.
