Corrosion Control & Operation Maintenance Services
Corrosion Assessment and Risk Identification
The Static Equipment Corrosion Adaptability Assessment Technology is a quantitative risk assessment methodology for refining & petrochemical facilities, developed in response to the ongoing degradation of crude quality in refineries. It is established by drawing on advanced overseas risk assessment technologies and relevant domestic and international standards.
● Establish control indicators for corrosive components in feedstocks. Define allowable limits for feedstock corrosivity to support long-term, stable operation. This supports rational crude oil procurement and blending, mitigates feedstock degradation, and controls corrosion risks at the source.
● Propose targeted local upgrade and revamping schemes based on existing unit conditions. Provide material upgrade recommendations for high-corrosion-risk locations. With limited material upgrades and enhanced monitoring of weak points, the overall tolerance of the unit to inferior feedstocks can be significantly improved, delivering greater economic benefits.
● Define technical requirements for process corrosion control measures.
● Evaluate current corrosion status and corrosion monitoring systems. Identify key corrosion issues and gaps in monitoring programs, and support targeted improvements to better understand and manage corrosion behavior.
● Provide theoretical support for corrosion inspection, testing, and maintenance during plant shutdowns and turnarounds.
Corrosion Assessment Process
Project Coordination and On-site Research
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Develop an assessment plan
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Carry out corrosion assessment work, submit reports, and revise and refine the reports. >>
Project Summary and Acceptance
>>
Project Coordination and On-site Research >>
Develop an assessment plan
>>
Carry out corrosion assessment work, submit reports, and revise and refine the reports. >>
Project Summary and Acceptance
>>
Material Evaluation
The rationality of the materials used in equipment and pipelines of the units shall be evaluated based on industry standards such as “Guidelines for Material Selection in Design of Equipment and Pipelines for High-Acid Crude Oil Processing Units” (SH/T 3129-2012) and “Guidelines for Material Selection in Design of Equipment and Pipelines for High-Sulfur Crude Oil Processing Units” (SH/T 3096-2012).
Theoretical Corrosion Rate Calculation
Based on the materials of equipment and pipelines in the facility, operating temperatures, sulfur content in the medium, and acid value, for equipment and pipelines with operating temperatures exceeding 220℃, the theoretical corrosion rate shall be calculated in accordance with standards such as the McConomy curve, API 581—“Risk-Based Inspection Method,” the Couper curve, and GB/T 26610—“Guidelines for Risk-Based Inspection Implementation of Pressure Equipment Systems.”
Salt precipitation risk
Regarding the ammonium salt crystallization issue in the unit’s reaction effluent system, calculate the risk of salt deposition based on relevant corrosion prediction models.
Weak Area Identification
In the assessment, a theoretical corrosion rate of 0.38 mm/a (15 mpy) is used as the threshold for identifying corrosion-prone areas; that is, any area with a theoretical corrosion rate ≥ 0.38 mm/a (15 mpy) is considered a corrosion-prone area.
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