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D2186-05 – Standard Test Method Technical Guide
🔬 Overview of Standard D2186-05
ASTM D2186-05 (Reapproved 2009) provides standard test methods for determining deposit-forming impurities in steam. All determinations are performed on condensed steam samples. Test Methods A, B, and C measure total deposit-forming material, while Test Method D analyzes special constituents such as silica and metals. The standard outlines specific precautions, equipment, calculation procedures, and applicability ranges for each method.
⚙️ Test Methods and Sensitivity Ranges
The following tables summarize the key test methods and their detection capabilities.
Table 1: Overview of Test Methods
| 🟦 Method | 📏 Parameter | 🎯 Range | ⚡ Notes |
|---|---|---|---|
| Test Method A (Gravimetric) | Total dissolved and suspended solids | ≥0.4 mg/L (ppm) | Only for long-time steady-state; not for transients |
| Test Method B (Conductivity) | Impurity concentration | 0.005 to 3 mg/L (ppm) | Depends on dissolved gas removal efficiency |
| Test Method C (Sodium Tracer) | Sodium content | 0.1 to 4.0 µg/L (ppb) | Most sensitive; best for transients |
| Test Method D (Silica and Metals) | Silica and metals | Varies by constituent | Covers impurities not in B or C |
Table 2: Detection Limits for Sodium in Test Method C