Introduction to Blind Flange Dimensions – Series A (ASME B16.47)

Blind flanges are essential components in piping systems, used to seal the ends of pipelines, valves, or pressure vessel openings. They are commonly applied in high-pressure or high-temperature environments where future extension or inspection may be required. The ASME B16.47 Series A blind flanges are designed for larger diameter pipes, typically ranging from 26" to 60", and provide robust strength for demanding industrial applications. These flanges are available in various pressure classes, including Class 75 through Class 900, ensuring compatibility with diverse operational requirements.

Series A blind flanges are generally thicker, heavier, and designed for higher mechanical stress compared to Series B flanges, making them suitable for critical process industries such as oil & gas, petrochemicals, and power generation. Dimensions typically include the outside diameter, thickness, bolt circle, number of bolt holes, and approximate weights, all standardized under ASME specifications.

The following sections provide detailed dimension charts and weight tables for Series A blind flanges across different pressure ratings, helping engineers, designers, and procurement specialists select the right flange for their project.