焦化装置V401顶安全阀弹簧的断裂原因

基金项目:

国家重点研发计划课题（2016YFC0801903）

详细信息

Fracture Cause of Safety Valve Spring on Top of V401 Coking Unit

1. Pressure-Vessel Inspection Institute of China Petroleum Dushanzi Petrochemical Corporation, Karamay 833699, China;
2. Coking Plant of China Petroleum Dushanzi Petrochemical Corporation, Karamay 833699, China;
3. Joint Storage and Transportation Workshop of Dushanzi Petrochemical Corporation, Karamay 833699, China

摘要: 某化工厂焦化装置V401顶安全阀启跳后不回座，安全阀解体后发现其弹簧发生断裂。采用化学成分分析、硬度检测、组织和断口形貌观察、腐蚀产物分析等方法分析了安全阀弹簧的断裂原因。结果表明：安全阀弹簧在湿H₂S环境中发生应力腐蚀形成裂纹，裂纹在交变载荷作用下扩展；当弹簧有效横截面积不足以承受介质内压的波动作用时弹簧发生断裂，属于腐蚀疲劳断裂。
- H₂S /
- 50CrVA弹簧钢 /
- 应力腐蚀 /
- 疲劳断裂
Abstract: A safety valve on top of V401 coking unit of a chemical plant did not return to its seat after the start-up. After disassembly of the safety valve, it was found that its spring was broken. The fracture cause of the safety valve spring was analyzed by methods of chemical composition analysis, hardness testing, microstructure and fracture morphology observation, and corrosion product analysis. The results show that the stress corrosion of the safety valve spring occurred in a wet H₂S environment and then cracks were formed. When the effective cross-sectional area of the spring was not sufficient to withstand the fluctuation of the internal pressure of the medium, the spring failed, which belonged to corrosion fatigue fracture.
- H₂S /
- 50CrVA spring steel /
- stress corrosion /
- fatigue fracture

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