ASME B16.47 large diameter flange guide (NPS 26 to 60): Series A (MSS SP-44) vs Series B (API 605), pressure classes 75-900, weights & bolt patterns. Quote in 30 min.
ASME B16.47 governs large-diameter steel flanges from NPS 26 through NPS 60. It incorporates two distinct series: Series A (derived from MSS SP-44) for heavy-duty industrial piping, and Series B (derived from API 605) for compact pipeline applications.
ASME B16.47 covers pressure-temperature ratings, materials, dimensions, tolerances, marking, and testing for steel pipe flanges in sizes NPS 26 through NPS 60.
| Design Feature | Series A (MSS SP-44) | Series B (API 605) |
|---|---|---|
| Origin Spec | MSS SP-44 | API 605 |
| Flange Thickness | Thicker & heavier | Thinner & lighter |
| Bolt Circle & Bolt Size | Fewer, larger diameter bolts | More, smaller diameter bolts |
| Pipeline Weight Impact | Higher weight, high bending rigidity | Compact design, lower weight |
A: No. Series A and Series B flanges have completely different bolt circle diameters, bolt hole quantities, flange thicknesses, and outer diameters. They cannot mate with each other.
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