Specifications
| Parameter | Specification |
|---|---|
| Series | SICCA 900-2500 GLC |
| Body Material | A217 WC6 / WC9 / C12A |
| Pressure Class | Class 900, 1500, 2500 |
| Size Range | NPS 2–8 (DN 50–DN 200) |
| Max Temperature | 650°C (1200°F) with C12A |
| Max Pressure | 431 bar (6250 psi) |
| Design Standard | ASME B16.34 |
| End Connections | Butt Weld (ASME B16.25) |
| Bonnet Design | Pressure seal design, non-rotating stem |
| Trim | Stellite 6 hard-faced seat and disc |
| IBR Certified | Yes (Standard Class) |
Material & Applications
Why Alloy Steel WC6/WC9/C12A: WC6 (1.25Cr-0.5Mo): The standard high-temperature upgrade from carbon steel. WC9 (2.25Cr-1Mo): Higher chromium for better creep and oxidation resistance in the 500–593°C range. C12A (9Cr-1Mo, modified): The highest temperature alloy steel option, extending service to 650°C for advanced power plant cycles. All three must be normalised and tempered.
Typical applications: Power plant main steam, hot reheat, boiler feedwater at elevated temperatures. WC6 for temperatures up to 593°C, WC9 for up to 593°C with higher creep resistance, C12A for up to 650°C. Essential for supercritical and ultra-supercritical power plant piping.
Pressure/Temperature Ratings
Permissible operating pressures per ASME B16.34:
| Rating | Permissible Operating Pressure at Temperature | |||
|---|---|---|---|---|
| WC6 — 900 | -29 to 38°C: 155 bar | 316°C: 125 bar | 427°C: 105 bar | 593°C: 20 bar |
| WC6 — 1500 | -29 to 38°C: 259 bar | 316°C: 209 bar | 427°C: 175 bar | 593°C: 33 bar |
| WC6 — 2500 | -29 to 38°C: 431 bar | 316°C: 348 bar | 427°C: 292 bar | 593°C: 55 bar |
| WC9 — 900 | -29 to 38°C: 155 bar | 316°C: 125 bar | 427°C: 105 bar | 593°C: 23 bar |
| WC9 — 1500 | -29 to 38°C: 259 bar | 316°C: 209 bar | 427°C: 175 bar | 593°C: 38 bar |
| WC9 — 2500 | -29 to 38°C: 431 bar | 316°C: 348 bar | 427°C: 292 bar | 593°C: 63 bar |
| C12A — 900 | -29 to 38°C: 155 bar | 316°C: 125 bar | 538°C: 75 bar | 650°C: 30 bar |
| C12A — 1500 | -29 to 38°C: 259 bar | 316°C: 209 bar | 538°C: 126 bar | 650°C: 50 bar |
| C12A — 2500 | -29 to 38°C: 431 bar | 316°C: 348 bar | 538°C: 209 bar | 650°C: 83 bar |