1. What are the essential online water chemistry measurements?
pH (typically 9.0-10.5 for steel protection). Conductivity (indicates total dissolved solids). Dissolved oxygen (<7 ppb ideal). Cation conductivity (measures corrosive anions). Silica (indicates contamination) - all critical for preventing corrosion.
2. How does modern instrumentation improve chemistry control?
Digital sensors provide real-time, continuous monitoring. Automated sampling systems reduce human error. Advanced controllers adjust chemical dosing precisely. Data integration with plant control systems. Early warning capabilities for excursions.
3. What are the key parameters for boiler water quality?
Total alkalinity (prevents acidic corrosion). Phosphate levels (when used for treatment). Chloride/sulfate concentrations (indicate contamination). Suspended solids (affects deposition). All parameters have specified control ranges.
4. How often should manual water sampling be performed?
Daily sampling minimum for critical parameters. More frequent during startups or upsets. Full suite analysis weekly or biweekly. Additional sampling after chemical adjustments. Frequency increases with system age/condition.
5. What are the consequences of poor sampling techniques?
Contamination from improper containers/preservation. Time delays affecting sample representativeness. Location errors (not sampling from active flow). Temperature changes altering chemistry. All leading to incorrect treatment decisions.
