Photo Gallery D3:  Wet Dripping Pipe

This problem is generally related to moisture migration and condensation at chill water and dual temperature piping systems, rather than at pipe exposed to an outdoor environment.  While wet and discolored insulation provides a clear indication to a potential CUI condition, pipe dripping water means far worse.  Even when not related to a failure, water droplets indicate that the insulation is saturated – providing no thermal benefit while exposing the pipe exterior to an untreated water environment.  Possible at any form of insulation and whether covered or not, water droplets define an extended period of time for CUI to have occurred.

The consequences of such a condition are unpredictable.  Older pipe, due to its superior quality and corrosion resistance will generally outlast similar conditions at newer pipe.  A pinhole leak at a larger main represents a larger repair cost although a lesser threat of bursting, whereas, the same level of corrosion attack against a threaded connection always presents the opportunity for a total pipe separation failure.  Copper and brass pipe are generally unaffected by such insulation failure in terms of exterior corrosion.

Since any form of wet dripping pipe can be detrimental to building operations, it should be addressed as soon a possible to reduce further damage.  Unlike some forms of CUI that can remain hidden for decades under vinyl or metal covered insulation, dripping wet insulation is immediately recognizable; any failure being related to a lack of maintenance.  Extensive rehabilitation of the pipe, if even possible, is often required before re-insulating.  Adding another layer of insulation over the existing wet insulation will provide a short term visual improvement while allowing the problem to accelerate.