ASME B16.47 flanges: Series A and Series B
Above NPS 24, flanges follow ASME B16.47, in two series that do not mate with each other. Choose the series and the class to see the dimensions.
Series A vs. Series B
| Series A | Series B | |
|---|---|---|
| Origin | MSS SP-44 | API 605 |
| Construction | More robust, fewer and thicker bolts | More compact and lighter, more and thinner bolts |
| Classes | 150, 300, 400, 600 and 900 | 75, 150, 300, 400, 600 and 900 |
| Typical use | Process piping, oil and gas | Heat exchangers and equipment |
Tables by series and class
Series A · class 150NPS 26 to 60Series A · class 300NPS 26 to 60Series A · class 400NPS 26 to 60Series A · class 600NPS 26 to 60Series A · class 900NPS 26 to 48Series B · class 75NPS 26 to 60Series B · class 150NPS 26 to 60Series B · class 300NPS 26 to 60Series B · class 400NPS 26 to 36Series B · class 600NPS 26 to 36Series B · class 900NPS 26 to 36 Up to NPS 24ASME B16.5 flanges
Frequently asked questions
Series A or Series B?
Follow the drawing or the project specification. The series have the same nominal diameter but different bolt patterns and outside diameters, so they do not mate with each other.
Does Dustre manufacture B16.47 flanges?
Yes. We forge and machine large-diameter flanges to order, in carbon steel, stainless, duplex, super duplex and nickel alloys, with EN 10204 3.1 certificate.
Quote a B16.47 flangeSeries A and B flanges in stainless, duplex, super duplex, nickel alloys and alloy steels, forged and machined at Dustre.
