Erosion Corrosion of Brass Valve Seat

erosion corrosion of brass valve seat


Building: Large 4 story office block

Manifestation: Brass control valves to fan coil units ‘letting by’ therefore giving poor temp control and waste of energy in air conditioning system.

Cause: Erosion corrosion with some possible cavitation due to high levels of ammonia in system as a result of microbial degradation of nitrite/nitrate inhibitor and low pressures at top of building.

Solution: Replace affected valves and flush out and inhibit system with non-nitrite inhibitor. Increase system pressures to prevent risk of cavitation at top of building

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