Geek Speak

Moisture plus warm temperatures (with or without the addition of other ingredients like oxygen, chloride, salts, acids, acid gases, and caustics) can lead to corrosion under insulation (CUI). CUI is costly; DuPont, for example, estimates it costs the company $10 million a year. Chemical engineer and writer Michael Lettich recommends a three-part cure in his Techs and Specs article. Pay attention to design and specification, install it with care, and be proactive about maintenance.