Test device and test method for CUI (corrosion under insulation)

Abstract

The invention provides a test device and a test method for CUI (corrosion under insulation). The test device for CUI comprises a tank body, wherein sealed chambers are formed in the tank body and comprise an immersion chamber capable of being filled with a leaching agent, a first filling chamber capable of being filled with a water immersion insulating material, a second filling chamber capable ofbeing filled with a dry insulating material as well as a first mounting chamber; the immersion chamber is communicated with the first filling chamber; the first filling chamber is formed between thesecond filling chamber and the immersion chamber to isolate the second filling chamber from the immersion chamber; the second filling chamber is formed between the first filling chamber and the firstmounting chamber to isolate the first filling chamber from the first mounting chamber; a working electrode is mounted in the first mounting chamber. An accurate basis can be provided by the test device for occurrence of CUI.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion under thermal insulation layers, and in particular relates to a corrosion test device and a test method under thermal insulation layers. Background technique [0002] Corrosion under insulation (CUI) refers to a corrosion phenomenon caused by the entry of moisture and corrosive media in pipes and equipment with insulation materials. An important feature of CUI is that the external insulation layer will create a high-temperature and high-humidity environment, which will lead to aggravated corrosion, and the most serious part of CUI is that it cannot be discovered in time, and when it is discovered, it is usually when the corrosion is very serious , and even safety accidents have occurred. [0003] However, at present, there is a lack of special test equipment for the corrosion under insulation layer of uniform (homogeneous pipeline composition and uniform structure) structure and non-unifor...

AI Technical Summary

Problems solved by technology

An important feature of CUI is that the external insulation layer will create a high-temperature and high-humidity environment, which will lead to aggravated corrosion, and the most serious part of CUI is that it cannot be discovered in time, and when it is discovered, it is usually when the corrosion is very serious , and even safety accidents have occurred

[0003] However, at present, there is a lack of special test equipment for the corrosion under insulation layer of uniform (homogeneous pipeline composition and uniform structure) structure and non-uniform structure (generally referring to weld joints or structures composed of multiple metal materials), in order to prevent metal corrosion. The occurrence of corrosion under the insulation layer of materials provides accurate evidence, which in turn poses a huge threat to the service safety of devices, facilities and components such as pressure vessels and pipelines

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