CUI 检查 - Corrosion under insulation

im体育APP supports clients from a wide range of industries to assist in evaluating solutions using CUI inspection to help mitigate corrosion under insulation.

CUI检查有助于识别 metal corrosion that occurs due to moisture and oxygen exposure. 通常在很长一段时间内未被发现, subsequently causing damage to the infrastructure, which can become hazardous and costly to repair. 在严重情况下, the damage caused is followed by costly site remediation, 长宕机, 以及法律问题. 

Corrosion under insulation typically occurs as a result of moisture infiltration on insulated carbon and low alloy steel equipment, which is operating at high temperatures with cyclic service in the CUI temperature range. Moisture trapped under or within the insulation can create an extremely aggressive environment, 加速了腐蚀的速度. 

Mitigating CUI, the role of coatings 

Protective coatings are often utilized in conjunction with installation design, 绝缘的选择, and inspection regimes as part of a systems approach to CUI prevention. 在这种情况下, the selection of an appropriate coating requires an understanding of the performance characteristics of the material subject to both high temperature cyclic and CUI conditions. We provide a wide range of specialist 涂料测试服务.

Several industry bodies have published documents and standards related to the mitigation of CUI, including standards specifically relating to coatings. 这包括ISO 19277: 2018, which identifies several classification environments upon which coatings are evaluated. Depending upon the intended operating temperature (including 低温测试 服务),  tests are conducted on both standard cured and heat conditioned samples for CUI categories 1, 2, 和3.

CUI检测方法

im体育APP Materials 技术 offers a variety of testing to verify performance for suitability under insulation in accordance with ISO19277:2018, 其中包括: 

• 热空调. Cyclic heat conditioning of coatings based upon the CUI category of choice. 
• 附着力. Evaluation of heat conditioned and standard cured materials both pre and post-exposure. 
• 人工老化. 环境 exposure in the form of neutral salt spray and water immersion. 
• 热循环试验. Repeated heating and cooling over multiple cycles from the maximum temperature of the relevant CUI category, 然后放入冷水中淬火.
• Multi-phase CUI cyclic corrosion test. A horizontal square pipe test is utilized to simulate a typical environment where CUI occurs; the test process includes dry heat, 热冲击, 浸泡在沸水中, 蒸汽接口, 关闭停机时间. 
• 低温暴露. Optional cryogenic cyclic testing for cryogenic categories described in the standard.
• 竖管试验 (休斯敦管试验). An optional CUI test method to evaluate the resistance of a coating to accelerated CUI conditions with shut down periods. The test includes wet/dry/heat/cool cycling of an insulated coated pipe for a total of 30 cycles. 

In addition to standardized test protocols, our engaged experts can provide bespoke corrosion under insulation testing programs for R&D, including testing of alternative materials and modified test regimes.

im体育APP优势

Our coatings specialists have several years’ experience working in CUI products and testing and can provide expertise to help you with your requirements. 

For more information about the corrosion under insulation testing and CUI inspection or to request a quote, im体育APP 今天.