Studies On Bearing Capacity And Application Of The Non-metallic Glass-reinforced Plastic Pipeline Used For Transporting High-pressure Natural Gas

Along with the country's rapid increase in demand for natural gas, high pressure, including H2S, CO2 gas corrosion and security protection technology has become China's Tarim, Ordos, Junggar basins main gas field safety, efficient development of the key. As the non-metallic pipe has good corrosion resistance, non-metal set in the low and medium pressure oil pipeline, high pressure injection water pipeline has been constantly used, while in the high-pressure natural gas, particularly sour gas in the industrial application yet.By large amounts of data and field research in the paper, qualitative analysis of the first glass pipe in the basic performance parameters and change the law based on the major diameter gathering pipeline size and pressure rating, based on multi-channel data acquisition systems, laser measurement vibration meter, foil strain gauges and strain gauge SI3535D conducted static-free epoxy glass lined steel, glass, steel and glass multi-layer composite pipe, steel pipe lined with stainless steel three kinds of stiffness, sealing performance, burst test, the test procedure established loading capacity and loading position displacement, strain and pressure to meet the linear inter-relationship. Second, paper analyzes the internal and external screw connection portions stress conditions, the degree of axial deformation and engagement is established, the external thread and the thread tooth deformation of joints to meet the deformation equation, strength checking condition, contact pressure calculation formula and elastic-plastic contact finite element analysis model, examples of calculated and experimental line. Reasonable assumption in non-metallic composite pipe by the continuous laminated structure composed of fibers based distribution, reinforcement, and no relative slip between the matrix under the premise of knowledge according to the geometric relationship between winding pitch, using cylindrical coordinates the establishment of force balance equations of by the ultimate strength of reinforced fiber and matrix strength of said non-metallic glass calculated ultimate bearing pressure pipe calculation formula, in accordance with the material nonlinear Von Mises yield criterion, the ideal elastic-plastic stress - strain relations and bilinear kinematic hardening guidelines for the establishment of a non-metallic pipe breaking load finite element analysis model, by model application to determine the best non-metallic glass pipe winding angle of angle 55o, get three non-metallic pipelines carrying capacity and temperature limits between the non-linear formula Pb=-0.0017T2+0.1057T+40.67, Pb=-0.0039T2+0.1652 T+38.077, Pb=-0.0039T2+0.1652 T+38.077. Based on the main failure mode of glass pipes, gaussian puff model, and coordinate transformation, to the critical discharge based site set up to facilitate the application of high-sulfur natural gas leak and diffusion of high consequence area radius, diffusion time of the simplified formula and put forward the corresponding security measures. Finally, the paper medium based on the Tarim gas field, working conditions and environmental conditions, select the 1km long pipeline has been applied for the analysis of objects analyzed to determine the pipe diameter, depth, pressure and other key parameters for the design and production management for non-metallic FRP pipe to provide a direct basis for the selection and application.