Hydronic pipe system should be cleaned with water and which chemical after installation?

Hydronic pipe system should be cleaned with water and which chemical after installation?

• A. Hydrochloric acid
• B. Trisodium Phosphate
• C. Sodium hydroxide
• D. Ammonia

Answer: (B)

When a hydronic piping system is installed, residues from flux, oils, and manufacturing debris can cling to the interior surfaces and hinder heat transfer and corrosion protection. Cleaning with water alone often isn’t enough to remove these contaminants, so a cleaner is circulated with the water to flush them out. Trisodium phosphate is an alkaline cleaner that effectively dissolves oils, greases, and flux residues, helping carry them out of the system during flushing and then allowing a proper rinse. It also helps neutralize acidic residues from flux and prepares the system for inhibitor protection. Hydrochloric acid would be corrosive to copper and other metals, sodium hydroxide is highly caustic and can damage gaskets and components, and ammonia can leave residues and fumes that aren’t suitable for a closed hydronic system.

When a hydronic piping system is installed, residues from flux, oils, and manufacturing debris can cling to the interior surfaces and hinder heat transfer and corrosion protection. Cleaning with water alone often isn’t enough to remove these contaminants, so a cleaner is circulated with the water to flush them out. Trisodium phosphate is an alkaline cleaner that effectively dissolves oils, greases, and flux residues, helping carry them out of the system during flushing and then allowing a proper rinse. It also helps neutralize acidic residues from flux and prepares the system for inhibitor protection. Hydrochloric acid would be corrosive to copper and other metals, sodium hydroxide is highly caustic and can damage gaskets and components, and ammonia can leave residues and fumes that aren’t suitable for a closed hydronic system.