国产精品第一区二区三区_欧美A级∨片高潮喷水_精品国产AV一区二区三区久久_欧美AⅤ视频一区二区三区

Time: 2017-02-17

It is understood that the advantages of gas with PE pipe **** is to find the original outdoor into the home pipe, from top to bottom into the polyethylene double wall corrugated pipe, through the special joint and steel-plastic conversion and underground PE pipe, indoor galvanized pipe connection, the completion of the transformation. Because of making full use of the original pipeline route, the damage to the road surface and the building body in front of the building is reduced, and the phenomenon of freezing and blocking at low temperature in winter is completely eliminated.

Hong Kong and China gas company is the Asian **** gas enterprises, 150 years of history. After joining "changchun gas" in 2008, it introduced its advanced safety management concept and made the safe operation of "changchun gas" enter the international standard. After a comprehensive review of the urban gas pipe network, it is determined that a total of 1417 km of risk pipe network needs to be reformed. In 2009, "changchun gas" started the large-scale pipe network transformation in the history of ***, and the Hong Kong and China gas company sent 110 person-time expert group to the site for technical guidance, making positive efforts to solve the problem of safe gas supply in our city. By the end of 2013, changchun gas had transformed 996 kilometers of dangerous old pipe network, reducing the risk of pipe network from 57% to 14.8%.