🔍 Key Concepts

• Hydrazine as an oxygen scavenger in high‑pressure boiler systems • Difference between removing dissolved oxygen and controlling pH / dissolved solids • Where common boiler chemicals are normally injected: condensate/feed system vs. directly into boiler drum

💭 Think About

• Think about the primary chemical role of hydrazine in a boiler: what specific problem in the water/steam cycle is it intended to solve? • Which treatment chemical is normally responsible for pH control, and is that the same chemical that removes dissolved oxygen? • If a chemical reacts with oxygen, does it typically increase or decrease total dissolved solids in the boiler water?

✅ Before You Answer

• Verify the main function of hydrazine (oxygen removal vs. pH control vs. scale control). • Check whether hydrazine reaction products are solids or gases and how that affects total dissolved solids. • Confirm typical injection point for hydrazine in marine boiler systems: condensate/feedwater line or directly into the boiler drum.