石墨填充缠绕垫片高温适用性评价指标研究  

Study of Evaluation Index of High Temperature Applicability of Graphite Filled Wound Gasket

作　　者：庄法坤[1] 刘畅[1] 李兵 张冲冲 刘宝林 Zhuang Fakun;Liu Chang;Li Bing;Zhang Chongchong;Liu Baolin(China Special Equipment Inspection and Research Institute,Beijing 100029,China;Binzhou city special equipment inspection institute,Binzhou 256600,China;Shandong Chambroad Petrochemicals Co.,Ltd.,Binzhou 256600,China)

机构地区：[1]中国特种设备检测研究院,北京100029 [2]滨州市特种设备检验研究所,山东滨州256600 [3]山东京博石油化工有限公司,山东滨州256600

出　　处：《山东化工》2019年第20期147-150,共4页Shandong Chemical Industry

基　　金：国家质检总局科技计划项目(2017QK188)

摘　　要：石墨填充缠绕垫片因其优良的压缩回弹性能被广泛应用于石化装置的法兰密封结构中,但由于高温导致垫片材料性能下降等原因,造成泄漏超标使得垫片无法满足使用要求,因此准确评价垫片的高温适用性对于法兰结构的密封质量至关重要。本文根据石墨材料老化和腐蚀机理,提出基于泄漏率和微量元素指标评价垫片的高温适用性,并开展了石墨填充金属缠绕垫片的高温时效试验和泄漏性能试验。试验结果表明,高温对石墨缠绕垫片影响显著,随着时间变化,垫片失重越来越大,严重时出现散架。根据试验结果,建立了不同温度下垫片重量变化同泄漏率的主曲线关系,可预估垫片在运行周期内的平均使用时间,为企业科学制定备品备件计划提供合理的指导。Graphite filled wound gaskets have such advantages as excellent compression resilience property and impact resistant performance,which are widely used in the bolted flange structures of petrochemical plants.However,due to the performance degradation of gasket material caused by high temperature,the leakage exceeds the standard value.Therefore,it is important for the sealing performance to evaluate the high temperature applicability of gasket.Based on the aging and corrosion mechanism of graphite materials,the leakage rate and trace element index are proposed to evaluate the high temperature applicability of gaskets.The high temperature aging test and leakage test of graphite filled metal wound gaskets are also preformed.The results show that the high temperature has an obvious influence on the gasket.With aging time increasing,the weight loss of gasket becomes larger and larger.Based on experimental results,the main curves relationship between gasket weight loss and leakage rate at different temperatures are established.They can be used to predict the gasket average service time and provide reasonable guidance for enterprises to make spare parts plan.

关 键 词：石墨填充缠绕垫 材料老化 泄漏率 高温适用性 评价指标 

分 类 号：TQ327.6[化学工程—合成树脂塑料工业]