Corrosion Under Insulation (CUI) leads to NH3 release

Pipe Pinhole

Incident overview

There were no injuries or property damage due to the Ammonia release from the pinhole in the 1” piping to the Hydro Cooler Surge Drum. The Ammonia vapor set the leak detector on at 50 ppm which activated the alarms. The Ammonia Vapor was drawn in from the outside of the building where the leak occurred by the inlet air louvers by the continuous vent fan. The affected area of the 1” piping to the Surge Drum was isolated by a valve and the Refrigeration Compressor Shutdown. The area of piping was covered by insulation and stripped back to expose the pinhole in the pipe. The local BSO was contacted for inspection with approval to replace piping by pressure welding the joints.

Pipe Pinhole

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