Insulation
How to Reduce Condensation on Chilled Water Pipes
Learn why condensation forms on chilled water pipes and how insulation, vapour control and protective cladding work together to manage moisture.
Why condensation forms
Condensation occurs when warm, humid air contacts a surface below the surrounding dew point. On chilled water and refrigeration pipework, this can lead to dripping, damaged insulation and corrosion beneath the cladding.
An effective system must limit heat transfer and prevent moisture from reaching the cold pipe surface.
Key considerations
Insulation thickness
Use the thickness specified for the pipe temperature and surrounding conditions.
Vapour control
Maintain a continuous vapour barrier around the insulation system.
Sealed joints
Seal joints, penetrations and fittings to reduce moisture entry.
Fittings and valves
Elbows, valves and flanges require the same level of protection as straight pipes.
Protective cladding
Use suitable cladding to protect the insulation from weather and physical damage.
Regular inspection
Check for damaged seals, loose cladding, staining or signs of moisture.
Areas that need attention
Most moisture problems begin at damaged or poorly sealed areas. Pay particular attention to seams, pipe supports, terminations, valves, flanges and locations where services pass through the cladding.
Outdoor installations should also be detailed to shed water and limit entry at overlaps and penetrations.
Can wet insulation be left in place?
Wet insulation may lose performance and contribute to corrosion. It should be inspected and replaced where necessary.