Under-heat-preservation-layer corrosion risk assessment method and under-heat-preservation-layer corrosion detection method
A technology for corrosion and risk assessment under the insulation layer, applied in the field of corrosion detection under the insulation layer and corrosion risk assessment under the insulation layer, can solve the problems of insufficient comprehensiveness, high cost and unaffordable enterprises, and improve work efficiency and accuracy. , Improve the overall economic benefits and ensure the effect of safe and stable operation
Pending Publication Date: 2020-12-15
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
Due to the existence of outer stainless steel or aluminum foil and insulation materials, CUI is relatively concealed, and it is often difficult to find it at the first time, which brings great difficulties to daily CUI inspection.
Refining and chemical enterprises have a lot of equipment and pipelines with insulation. If the insulation structures are removed one by one for CUI inspection, it is often time-consuming and laborious, and the various costs are high, which is difficult for enterprises to afford.
[0004] At present, domestic petrochemical enterprises have not yet formed a systematic hierarchical inspection management method for corrosion under insulation of equipment or pipelines. The existing CUI on-site inspection is mainly realized through visual inspection, and the key objectives are not determined before the inspection, which is blind, inefficient and Not comprehensive enough
Method used
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Embodiment 1
[0110] Select the equipment and pipelines of an enterprise's atmospheric and vacuum devices for CUI risk assessment and testing. The specific process is as follows:
[0111] 1. Set up a CUI evaluation team consisting of 5 people. All members are familiar with the device process flow, basic knowledge of metal corrosion and CUI corrosion mechanism, and have relatively comprehensive professional theoretical knowledge and practical experience in metal corrosion.
[0112] 2. The CUI evaluation team selected a total of 120 units / pieces of equipment and pipelines with thermal insulation structures in the atmospheric and vacuum device, including 96 units / pieces of carbon steel or low alloy materials and 24 units / pieces of stainless steel. Based on the basic information data, the CUI failure probability is evaluated and the score is calculated for each pipeline / pipeline and equipment. The evaluation basis is shown in Table 7 and 8. According to the CUI failure probability score of each...
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The invention relates to the technical field of corrosion under a thermal insulation layer, in particular to an under-heat-preservation-layer corrosion risk assessment method and an under-heat-preservation-layer corrosion detection method. The under-heat-preservation-layer corrosion risk assessment method comprises the steps that risk assessment is conducted on under-heat-preservation-layer corrosion, then the under-heat-preservation-layer corrosion risk grade is determined according to an assessment result, and risk assessment comprises corrosion failure probability assessment and failure consequence influence assessment. According to the evaluation method, the optimal utilization of inspection resources is achieved, the CUI inspection work efficiency and accuracy are greatly improved, the detection cost is reduced, the safe and stable operation of a petrochemical device is ensured, and the comprehensive economic benefits of enterprises are favorably improved.
Description
technical field [0001] The invention relates to the technical field of corrosion under insulation layers, in particular to a method for assessing risks of corrosion under insulation layers and a method for detecting corrosion under insulation layers. Background technique [0002] Corrosion Under Insulation (CUI) refers to the corrosion phenomenon caused by the penetration of water and other corrosive substances into the insulation layer for pipes or equipment covered by the insulation layer. Corrosion under the insulation layer of pipelines or equipment is usually caused by the damage of the outer protective layer due to installation, operation or other external factors during the use of the insulation material and the outer protective layer after installation, resulting in the entry of moisture to form a local corrosion environment, which in turn causes Corrosion under insulation. Studies have shown that the probability of corrosion under the insulation layer will increase...
Claims
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IPC IPC(8): G06Q10/06G06Q50/04
CPCG06Q10/0635G06Q10/0639G06Q50/04Y02P90/30
Inventor 段永锋李晓炜张宏飞樊志帅于凤昌王宁包振宇
Owner CHINA PETROLEUM & CHEM CORP