规划设计
张小强等：寒冷地区埋地输气管道最低设计温度选取
寒冷地区埋地输气管道最低设计温度选取
张小强，
蒋庆梅
摘要：为了有效保证中俄东线天然气管道在寒冷地区的止象性能，需要明确管道的最低设计温度，而到目前为止，在国内理地输气管道工程设计中对管道的最低设计温度未造行确定。通过对国内外主要输气管道标准和国外寒冷地区典型输气管道工程的解读与分析，同时结合我国寒冷地区埋地输气管道的特点，推荐理地输气管道最低设计温度选取0℃（管道埋设于冻土线以下）和管项理深处最冷月单日最低地温值并向下围整至5℃的倍数（管道理设于冻土线以上）。建议中俄东线天然气管道工程线路埋地管道最低设计温度选取-5C。提出最低设计温度的确定原则、方法和推荐值，为今后的工程建设提供一定的借鉴与参考
关键词：寒冷地区；埋地输气管道；中俄东线天然气管道；最低设计温度；冻土线 Doi :10.3969/j.issn.10066896.2017.12.009
Selection of the Minimum Design Temperature of Buried Gas Transportation Pipelines in Cold Regions
Zhang Xiaoqiang, Jiang Qingmei
Abstract: In order to ensure the crack arrest performance of ChinaRussia Eastern Natural Gas Pipe line in cold regions, the minimum design temperature of pipelines should be clarified. However, un til now the minimum design temperature of pipelines is not determined in domestic buried gas transpor tation pipeline project designing.Through the interpretation and analysis of main standards for gas transportation pipelines at home and abroad and typicel gas transportation pipeline projects in cold re-gions abroad, and combined with the characteristics of buried gas transportation pipelines in cold re gions of our country, it is recommended that the minimum design temperature of buried gas transpor tation pipelines should be O C (when pipelines are buried below the permafrost line) and the minimum value of the geotemperature in the single day of the coldest month with rounding downwards to a mul-tiple of 5 °C (when pipelines are buried above the permafrost line). It is suggested that the minimum design temperature of buried pipelines of China Russia Eastern Natural Gas Pipeline Project should be 5 C. The principle of certainty, method and recommended value of the minimum design tem perature are proposed, which provides certain references for future project construction
Key words: cold regions; buried gas transportetion pipes; ChinaRussia Eastern Natural Gas Pipe line; minimum design temperature; permafrost line
随若管道建设的发展，通过寒冷地区（尤其是我国东北和西北地区）的输气管道越来越多，低温条件下管道产生裂纹的可能性也大大增加。为了保证管道在低温环境中长期服役的安全性，管道在设计时必须考患管道裂纹失稳扩展的控制，要求管道母材有足够的阻止裂纹快速扩展的能力"。
管道断裂可以分为脆性断裂和韧性断裂两种就脆性断裂而言，随着冶金技术水平的提高，在我国这样的气候条件下，一般不具备发生脆性断裂的
"中国石油管道局工程有限公司 30
万方数据
条件。但当管道的CVN值较低时，管道易发生韧性断裂3，要防止管道韧性断裂的发生，需要对管材的韧性提出更高的要求"，同时，所有关于钢管的韧性试验温度及参数指标的确定均需要管道的低设计温度作为依据。但是，目前国内外输气管道的相关标准、规范仅给出了最低设计温度的定义和原则要求，如何取值却不明确。为了保障寒冷地区输气管道的安全运行，方便钢管韧性试验温度及指标参数的确定，开展了对塞冷地区输气管道最低设
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