When a jacketed and insulated piping system is properly specified and installed correctly, it is generally assumed that it will provide sufficient resistance to bulk water entry. However, these systems can, at times, be subjected to challenging and unexpected weather conditions with less than satisfactory jacket detailing, allowing the insulation system to become wet, diminishing thermal performance, and introducing the potential for corrosion under insulation (CUI).
Rather than planning for water intrusion as an eventuality, many assume that it is a merely a possibility; however, an effective design is one that anticipates that water will, at some point, enter the jacketed piping system, and will require different strategies to prevent corrosion due to water intrusion. Designing a system that can tolerate a challenging bulk water entry event requires considering the benefits and limitations of all insulations, the ability of moisture to be stored and passed through these insulations, and the impact of water-activated corrosion inhibitors. Additionally, design needs to address how well the insulation will allow water to exit the system after water infiltration.
Piping Insulation System Design to Tolerate a One-Time
Challenging Water Intrusion Event