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城市埋地燃气管道泄漏会带来巨大影响。对城市埋地燃气管道泄漏的原因进行了分析,阐述了造成城市埋地燃气管道防腐层破损导致泄漏的人为因素和自然因素,介绍了城市埋地燃气管道外防腐层检测和各种常用壁厚检测技术的优缺点。 相似文献
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黄楠姚呈祥霍晋 《中国石油和化工标准与质量》2014,(10):258-259
近年来不断发生天然气输送管道事故,其造成的人员伤亡、财产损失提醒人们确保管道安全运行的重要性。长北项目部天然气中央处理厂管道已运行数年,所属的埋地管道包括4条干线及16条支线,通过对埋地管道的风险评估,确定危险源的分布,得到了各段管道的泄漏风险值,提出了可使管道泄漏风险降低的措施,为生产过程中的安全提供了一定的保障,同时对埋地管道失效进行了预测,为管道安全运行提供了依据。 相似文献
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2014年12月16日19时12分,青海省西宁市滨河路五一桥西发生天然气埋地管道泄漏事故。据初步了解,发生天然气泄漏事故的埋地管道为一建成10年的老管道,泄漏出的天然气进入与之相邻的排水管道。 相似文献
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何军 《中国石油和化工标准与质量》2013,(10):237+232
随着中国城市建设进程的加快,城市燃气管网也在逐渐扩大,不同管线交错复杂。由于燃气管道通常为埋地敷设,腐蚀成为了破坏埋地管道,导致管道失效的重要原因。埋地管道受到腐蚀侵害后常发生泄露事故,会造成巨大的经济损失和资源浪费,甚至引发煤气中毒、火灾等灾害事故。在燃气管网当中最常用的材质就是钢管,其优点甚多,但其防腐性能较差。本文主要探讨埋地燃气钢管腐蚀的形式和原因以及防腐措施。 相似文献
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赵振国 《中国石油和化工标准与质量》2014,(12)
石油输送管道发生泄漏后,极易造成经济损失、环境污染、人员伤亡事故的发生,应急力量应在第一时间处置泄漏事故,减少危害性,介绍了消防应急救援力量处置石油输送管道泄漏事故前期准备工作,提出了应急处置的注意事项,为消防应急救援人员处置油品管道泄漏事故提供一些启发。 相似文献
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高含硫天然气管道经长期的内外腐蚀,经常发生泄漏事故.为了减少和降低天然气管道泄漏事故对人的危害,对甲烷及硫化氢的扩散规律进行研究日趋重要.利用计算流体力学的方法,采用仿真软件对高含硫天然气架空及埋地管道穿孔泄漏后的甲烷、硫化氢气体的扩散进行了数值模拟.架空管道泄漏初期为体积分数等值线呈对称分布的射流,泄漏至60s后无爆... 相似文献
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王兰花 《中国石油和化工标准与质量》2014,(10):231-232
油气长输管道沿线经过的地形复杂多变,甚至不可避免地要穿越环境敏感点,如果管道发生泄漏事故,就会对环境产生不良影响。本文通过对国内外长输管道泄漏事故的统计、分析,确定了泄漏事故的主要影响因素,得出了综合分析结论,为国内管道的穿越工程的管理提供了借鉴。 相似文献
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Saturated very long chain fatty acids (fatty acids with greater than 22 carbon atoms; VLCFA) accumulate in peroxisomal disorders,
but there is little information on their turnover in patients. To determine the suitability of using stable isotope-labeled
VLCFA in patients with these disorders, the metabolism of 22-methyl[23,23,23-2H3]tricosanoic (iso-lignoceric) acid was studied in rats in vivo and in human skin fibroblasts in culture. The deuterated iso-VLCFA was degraded to the corresponding 16- and 18-carbon iso-fatty acids by rats in vivo and by normal human skin fibroblasts in culture, but there was little or no degradation in peroxisome-deficient (Zellweger’s
syndrome) fibroblasts, indicating that its oxidation was peroxisomal. Neither the 14-, 20-, and 22-carbon iso-fatty acids nor the corresponding odd-chain metabolites could be detected. In the rat, the organ containing most of the iso-lignoceric acid, and its breakdown products, was the liver, whereas negligible amounts were detected in the brain, suggesting
that little of the fatty acid crossed the blood-brain barrier. Our data indicate that VLCFA labeled with deuterium at the
ω-position of the carbon chain are suitable derivatives for the in vivo investigation of patients with defects in peroxisomal β-oxidation because they are metabolized by the same pathways as the
corresponding n-VLCFA. Moreover, as iso-VLCFA and their β-oxidation products are readily separated from the corresponding n-fatty acids by normal chromatographic procedures, the turnover of VLCFA can be more precisely measured.
A preliminary report of part of this work (Reference 18) was presented at the 5th International Symposium on the Synthesis
and Applications of Isotopes and Isotopically Labelled Compounds, Strasbourg, France, June 20–24, 1994. 相似文献
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为掌握佛山市顺德新城区降水中污染物的情况,2015年7月至8月,文章作者分别在雨天进行了降水取样,对降水中的pH、电导率、常见阴离子(F-、Cl~-、NO_3~(2-)、SO_4~(2-))及部分重金属(铅和镉)进行监测分析。选择有相关数据的珠江三角洲和石家庄、厦门等地的降水中污染物的情况进行对比。结果表明,顺德新城区降水中的p H和部分阴离子浓度优于珠江三角洲平均值,酸雨类型属于硫酸和硝酸混合型;其水体洁净程度略差于石家庄;铅和镉的浓度也高于厦门,甚至部分超出了人体能直接接触的安全范围。 相似文献
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The proportions of the different lecithin fractions have been determined in HeLa and KB tissue culture cells and Ehrlich Ascites
tumor. 82.8% of the total phosphatidyl choline phosphorus is found in fraction 3 of HeLa cells. The major phosphatidyl cholines
found in KB cells and Ehrlich Ascites tumor are in fractions 3 and 4 and representing 66.6% and 88.7% of the total phosphatidyl
choline P, respectively. The incorporation of 1,2-14C-choline and 1,2-14C-ethanolamine into the various phosphatidyl choline fractions has been assayed to determine their biosynthesis in Ehrlich
Ascites tumor. The incorporation of 1,2-14C-choline into fractions 3 and 4 is 100 times the 1,2-14C-ethanolamine. This evidence indicates that the methylation pathway of phosphatidyl choline synthesis is very low in HeLa,
KB and Ehrlich Ascites cells.
One of 13 papers presented at the symposium “Lipid Metabolism in Cells in Culture,” AOCS Meeting, Houston, May 1971.
Part of a thesis submitted to the Graduate School of the University of North Dakota in partial fulfillment of the Degree of
Master of Science. 相似文献
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微乳液在萃取分离中的研究进展 总被引:4,自引:0,他引:4
概述了微乳液的定义及其特性,介绍了微乳液作为分离介质萃取分离金属离子、有机化合物及生化物质等方面的研究进展。指出微乳液萃取过程中不存在毒性试剂,且具有分离速度快、萃取效率高、操作方便、油相可以反复利用等优点,具有良好的工业应用前景。 相似文献