Recently, the "Beijing Railway Transport Development Plan for the Twelfth Five-Year Plan" was officially released. The "Planning" clearly stipulates that public transportation should be vigorously developed. Diesel buses are still the main models of the capital's public transportation.
The "Plan" clearly stipulates that during the "Twelfth Five-Year Plan" period, the number of public electric vehicles in the central city of Beijing should reach 23,000. The energy structure of the vehicles is mainly based on the national IV and the national V diesel buses, supplemented by natural gas buses, and the track is derailed. It is supplemented by trams, pure electric vehicles and hybrid buses.
The "Plan" also shows that the Beijing Municipal Government has not adopted a mandatory approach in the development of new energy and alternative energy vehicles, but has proceeded step by step and acted in accordance with the laws of scientific development.
In the "Planning", public transportation has become the focus of development during the "Twelfth Five-Year Plan" period in Beijing. By the end of the "Twelfth Five-Year Plan" period, the proportion of public transportation in Beijing's central urban areas will strive to reach 50%, the comprehensive passenger transportation hub will strive to reach 14 and five public transportation centers will be built. The overall planning goal pays more attention to the improvement effect of Beijing's overall transportation. There is no specific type of vehicle that develops new energy or suppresses diesel vehicles.
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Flexible composite pipe can be divided into land flexible composite pipe and downhole flexible composite pipe according to the laying mode; It can be divided into flexible composite pipes for oil and gas fields and flexible composite pipes for coal mines. According to the structure, it can be divided into adhesive flexible composite pipe and non adhesive flexible composite pipe.
Relatively rigid pipe (metal pipe), the flexible composite pipe has low bending stiffness under the same tensile strength due to the multi-layer composite structure. Therefore, under the same pressure bearing conditions, the flexible composite pipe can have smaller bending radius, so it can withstand large deformation. It has obvious advantages for ground laying pipelines and buried pipelines incomplex terrain.
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