SCC of brass fitting under insulation

SCC of brass fitting under insulation

 

Building: Office chilled water system

Manifestation: Leakage of brass valves under thermal insulation

Cause: Poorly fitted phenolic foam insulation allowing condensation on pipe. High applied torque to fittings coupled with leaching of ammonia resulting in stress corrosion cracking of fitting from outside.

Solution: Replacement of affected valves. Repair of insulation to prevent condensation on pipework

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