大型LNG储罐工程接地材料的选用分析
Analysis of Grounding Materials Selection for Large LNG Storage Tank Engineering
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- 引用格式:
-
董洪稳,曲超,秦丕伟,金剑,黄洲.大型LNG储罐工程接地材料的选用分析[J].天然气与石油,2020,38(5):108-113.doi:10.3969/j.issn.1006-5539.2020.05.018
Dong Hongwen,Qu Chao,Qin Piwei,Jin Jian,Huang Zhou.Analysis of Grounding Materials Selection for Large LNG Storage Tank Engineering[J].Natural Gas and Oil,2020,38(5):108-113.doi:10.3969/j.issn.1006-5539.2020.05.018
- DOI:
- 10.3969/j.issn.1006-5539.2020.05.018
- 作者:
- 董洪稳，曲超，秦丕伟，金剑，黄洲
Dong Hongwen，Qu Chao，Qin Piwei，Jin Jian，Huang Zhou
- 作者单位:
- 海洋石油工程股份有限公司
Offshore Oil Engineering Co., Ltd., Tianjin, 300461, China
- 关键词:
- LNG储罐;接地材料;腐蚀速率;土壤电阻率;材质
LNG storage tank; Grounding materials; Corrosion rate; Soil resistivity; Materials
- 摘要:
- 大型LNG储罐工程绝大多数分布在沿海一带,接地网的重要性不言而论,沿海地区土壤具有含盐高、腐蚀性强的特点,直接影响接地材料的使用寿命。为保证接地系统的安全、稳定,选择可靠、耐用的接地材料是关键环节。针对沿海地区土壤及厂区外界环境特点,分析铜覆钢复合材料、锌覆钢复合材料和非金属接地模块等材料在土壤腐蚀环境中的抗腐蚀性、腐蚀机理,并综合考虑土壤污染、施工成本、阴极保护系统及土壤中其他金属设备等影响因素,选取经济、环保且抗腐蚀性强的接地材料。介绍行业内一种腐蚀速率测试方法,根据腐蚀速率测试结果、使用年限、土壤电阻率等参数,提出接地材料规格选用和用量计算方法,并制定接地材料选用方法,为今后LNG储罐工程接地材料的选用提供借鉴。
Most of the large LNG storage tank engineering is located in coastal areas,which is characterized by high salinity and strong corrosion. The importance of the grounding grid is self-evident, as it directly affects the service life of grounding material.In order to ensure the safety and stability of the grounding system, the selection of reliable and durable grounding materials is the key and the material should hold the advantage that ensures lower construction cost of LNG storage tank.In view of the characteristics of the coastal soil and plant environment,the copper clad steel composite, zinc clad steel and non-metallic grounding module are analyzed for their corrosion resistance, corrosion mechanism and causes in soil,andtaking into consideration the influencing factors of these materials on soil pollution, construction cost, catholic protection system and other metal equipment in the soil, an environmental friendly grounding material with lower costs and strong corrosion resistance are selected.A method for testing corrosion rate in this industry is presented, and the material selection and calculation method of the grounding materials are proposed according to the corrosion rate, service life, soil resistivity and other parameters.A case project is taken for analysis and calculation, with feasible method forselecting grounding material, which is a good reference for LNG tank engineering in the future.
