Specifications
| Parameter | Specification |
|---|---|
| Series | SICCA 150-600 GLC |
| Body Material | A217 WC6 (1.25Cr-0.5Mo Alloy Steel) |
| Pressure Class | Class 150, 300, 600 |
| Size Range | NPS 2–10 (DN 50–DN 250) |
| Max Temperature | 593°C (1100°F) |
| Max Pressure | 103 bar (1500 psi) |
| Design Standard | BS 1873 |
| End Connections | Flanged RF/RTJ, Butt Weld |
| Bonnet Design | Bolted bonnet, outside screw & yoke |
| Trim | Trim 5 (Stellite/Stellite) for high-temperature service |
| IBR Certified | Yes |
Material & Applications
Why Alloy Steel WC6: A217 WC6 contains 1.25% chromium and 0.5% molybdenum, providing significantly better creep and oxidation resistance than carbon steel above 425°C. It is the standard upgrade from WCB for main steam and high-temperature applications. Must be used in normalised and tempered condition.
Typical applications: High-temperature steam systems in power plants, sugar factory boilers, refinery heaters, and process plants where carbon steel WCB reaches its temperature limit. WC6 extends service capability to 593°C with superior creep resistance.
Pressure/Temperature Ratings
Permissible operating pressures per ASME B16.34:
| Rating | Permissible Operating Pressure at Temperature | |||
|---|---|---|---|---|
| Class 150 | -29 to 38°C: 20 bar | 316°C: 10 bar | 427°C: 6 bar | 593°C: 1 bar |
| Class 300 | -29 to 38°C: 52 bar | 316°C: 42 bar | 427°C: 35 bar | 593°C: 7 bar |
| Class 600 | -29 to 38°C: 103 bar | 316°C: 83 bar | 427°C: 70 bar | 593°C: 13 bar |