摘要
目前油气储运系统中的法兰连接设计多采用基于m (垫片系数 )、y(最小预紧比压力 )系数的法兰设计标准 ,该方法不能真实地反映出当设计压力、温度、流体介质参数变化时而出现的泄漏量或密封性的变化。介绍了美国压力容器研究会的PVPC设计法 ,该方法提出的新的垫片密封参数 ,不但考虑了垫片材料、结构和厚度的关系 ,而且还介入了垫片尺寸、介质性质、压力、温度等因素的影响 ,较客观地描述了垫片的密封特性。按PVPC方法计算了直径为 15～ 4 0mm、压力为 0 .6～ 4 .0MPa的焊钢制管法兰在标准螺栓载荷下的泄漏率 ,结果表明 ,同样的垫片 ,在同样压力下 ,直径越大 ,密封性越差 ;在不同工作压力下 ,随着压力的增大 ,泄漏率增大 。
The design of the flanged joint of natural gas storage and transportation system is based on the criterion of coefficient m,y. However,this kind of connection can not be used to analyze the sealing performance and control the leakage volume. To determine the sealing performance of the flanged joint of a natural gas engineering in Jingbian Project,the new coefficient G b,a and G s, are adopted to compute the leakage rate of pipe flanges of GB series under the condition of the diameter of 15 to 40 mm and the pressure of 0.6 to 4.0 MPa and with the load of standard bolts. The results indicate that the mass leakage rate is 5.81 ～ 10 -6 to 0.37 mg/(s·mm),and the seal quality is in the middle of economy,standard and tightness,and the leakage volume of flange is 5.3 L/d under the condition of the diameter of 40 mm and the pressure of 1 MPa in standard air pressure. In order to enhance the sealing performance, the PVRC method can be adopted to design the flanges by computing the bolt's loads through the mass leakage rate requested.
出处
《油气储运》
CAS
北大核心
2003年第10期47-49,共3页
Oil & Gas Storage and Transportation
关键词
天然气
储运系统
法兰
密封性
参数测试
natural gas, storage and transportation system, flange, sealing performance,leakage rate, analysis
