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Thermal insulation is a material that restricts the flow of heat. Heat spontaneously flows from a high temperature region to a low temperature region, and the greatest heat flow occurs through the path of least resistance. For this reason, thermal insulation is used as a barrier between two bodies at different temperatures either to reduce heat loss from the hotter body or to reduce heat entry into the cooler body.
Thermal insulation of piping, valves, tanks, and vessels is achieved by an INTEGRAL SYSTEM of corrosion mitigating coating, thermal insulation media, and external cladding. For many years the use of thermal insulation coatings TIC ‘s has been used for personal protection against burns, solar radiant heat gain protection and limited energy process preservation as an alternative to conventional insulation such as mineral wool or calcium silicate. However, the downside of these conventional systems is that they leave an air gap to the primed surface and when damage to the jacketing occurs then corrosion under insulation (CUI) can become a real issue for the plant as it can often go unseen for years. The thermal insulation coatings attempt to alleviate this issue as they are applied direct to the primed surface forming a monolithic barrier and can be inspected visually without removal of the insulation system. Hence CUI is no longer an issue.
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Since 2002, a corrosion inhibiting chemistry package has been an integral part of two specific industrial insulations. This paper explains, at a molecular level, how this package engages a two-pronged defense (physical coating and pH buffering) against CUI.