ASME B16.47 Large Diameter Stainless Steel Flanges
Heavy-Duty Flanges for Critical Large-Scale Piping Systems
1. Standard Overview
ASME B16.47 Standard: Covers large diameter flanges from 26" to 60" (DN650 to DN1500)
Two Series:
Series A (MSS SP-44): Typically used in petrochemical and water industries
Series B (API 605): Common in oil & gas applications
Materials: ASTM A182 (304/304L, 316/316L, 321, 347, duplex/super duplex)
2. Key Specifications
| Parameter | Series A | Series B |
|---|---|---|
| Size Range | 26"-60" | 26"-60" |
| Pressure Classes | 150# to 900# | 75# to 900# |
| Bolt Holes | Even number only | Even or odd number |
| Hub Design | Longer taper | Shorter taper |
| Weight | 10-15% heavier | More compact |
3. Pressure-Temperature Ratings
| Class | 150# | 300# | 400# | 600# | 900# |
|---|---|---|---|---|---|
| psi @ 100°F | 275 | 720 | 960 | 1440 | 2160 |
| Max Temp (°F) | 850 | 850 | 850 | 850 | 850 |
4. Material Selection Guide
| Material | ASTM | Max Temp (°F) | Key Advantage |
|---|---|---|---|
| 304/304L | A182 | 1500 | Cost-effective |
| 316/316L | A182 | 1500 | Chloride resistance |
| 321 | A182 | 1500 | Stabilized for welding |
| Duplex 2205 | A182 | 600 | 2x yield strength |
5. Manufacturing Process
Plate Cutting: CNC plasma/waterjet for precise dimensions
Forming: Hydraulic pressing for uniform thickness
Heat Treatment: Stress relieving for dimensional stability
Machining: Vertical boring mills for large diameters
Testing: 100% RT for Class 900 flanges
6. Quality Assurance
Dimensional Checks: Per ASME B16.47 Annex
NDE Testing: RT (Class 900), UT, PT
Hardness Testing: Per ASTM A961
Material Certs: EN 10204 3.2 with PMI
Face Flatness: 0.06mm per 25mm verified with laser
7. Industry Applications
Oil & Gas: Pipeline compressor stations
Petrochemical: Reactor discharge lines
Power Generation: Steam turbine inlets
Water Treatment: Large diameter mains
8. Why Choose Our B16.47 Flanges?
✔ Full ASME B16.47 Compliance
✔ Both Series A & B Available
✔ NACE MR0175 Options for Sour Service
✔ Heavy-Wall Construction for Safety Margins
✔ Complete Documentation Package
9. Custom Options Available
Special facing finishes (RTJ, serrated)
Clad construction (carbon steel with stainless overlay)
Insulating flange kits
Custom bolt hole patterns
Extended hubs for special wall thickness
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