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ASME B16.47 2020 Series A and Series B Flanges differences
What is ASME B16.47 Flange Series?
The ASME B16.47 standard provides the use of two types of flange series.
- Series A flanges and
- Series B flanges.
Series A specifies flange dimensions for general-use flanges whereas Series B specifies flange dimensions for compact flanges. Series A flanges have larger bolt circle diameters than Series B flanges.
This is to be noted that Series A and Series B flanges are not interchangeable. So, the user must take care of the compatibility issues that may arise by mistake. In most cases, flanged valves, equipment bolted between flanges, and flanged equipment are compatible with only one series of these flanges.
Difference between ASME B16.47 Series A and Series B Flanges
The following table provides the major differences between ASME B16.47 Series A and Series B flanges.
| Sr. No | Parameter | ASME B16.47 2020 Series A Flanges | ASME B16.47 2020 Series B Flanges |
| 1 | Origin | Earlier Series A flanges were known as MSS SP44 flanges. | These flanges were known as API 605 flanges. |
| 2 | Dimension | Flange Outer diameter, Bolt Circle Diameter, Flange Thickness, Bolt Diameter, etc. are larger for Series A Flanges for the same pressure rating class. | B16.47 Series B flanges are compact as compared to series A flanges. |
| 3 | Strength | ASME B16.47 Series A flanges are comparatively stronger. Hence, can handle more external loading before leakage. | Load bearing for the same pressure class is relatively less. |
| 4 | Fastener Requirement | The quality requirement is less but bigger size. For example, as seen in Fig. 1, a 30-inch class 150 series A flange needs 28 bolts of 1-1/4 inch diameter. | The quantity of fasteners is more. For example, a 30-inch class 150 Series B flange requires 44 bolts with a diameter of 3/4 inch. |
| 5 | RING JOINT TYPES | Available from Class 300 through Class 900 | Does not exist. |
| 6 | Pressure Class 75 | Not available for series A flanges | Available for Series B flanges |
| 7 | Flange Weight | The weight of ASME B16.47, series A flanges are more. So, they exert more load on piping supports. | Weight is comparatively less |
| 8 | Cost | More expensive. | cheaper. |
| 9 | Industry Use | More frequently used. Used for critical applications. | Less frequently used. Normally used for non-critical applications. |
Dimensional Comparison for ASME B16.47 2020 Series A and Series B Flanges
Refer to Fig. 1 which shows the comparative dimensions for a 36″ (150 class) Series A and Series B ASME B16.47 flanges.
The following table provides the major differences between ASME B16.47 Series A and Series B flanges.
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