The Beijing-Guangzhou high-speed railway was formally opened on December 26. The longest-running high-speed railway in the world runs through nearly 30 cities. After the opening, it takes only 7 hours and 59 minutes from Beijing to Guangzhou, greatly shortening the distance between China's north and south. Traffic time. From the start of construction of the Wuhan-Guangzhou section in June 2005 to the opening of the entire railway line today, China has built a new "artery" that runs through the north and the south in seven and a half years. Unlike traditional railways, high-speed railways use ballastless tracks, which places higher demands on the waterproof layer of the railway. Waterproof layer not only needs to have the basic performance of anti-seepage, anti-crack, but also can withstand the impact of high-speed, heavy load, alternating impact and other trains running at high speed. Therefore, the polyurethane products produced by Yantai Wanhua will be put to use.
In the construction of high-speed iron waterproofing, coatings made of "polyurea material" are generally used. It not only has excellent wear resistance, impact resistance, crack resistance, UV resistance and high and low temperature resistance, but also has extremely high construction efficiency. It can reach design thickness in one construction, and is not affected by environmental temperature and humidity. The rapid spray forming on any surface, slope and vertical surface completely meets the demanding requirements of ballastless track, and the main raw material for producing polyurea material is polyurethane.
The reporter learned from Wan Hua that many companies that used Yantai Wanhua polyurethane series products as raw materials won the bid in the high-speed rail construction project, and the polyurea coatings made by Wanhua Polyurethane had physical properties such as tear strength and elongation. The performance is even better. In addition to waterproof materials, anti-corrosion coatings for EMUs, railway tracks, and railway stations also require a large amount of polyurethane. With its leading position in the polyurethane industry, Wanhua successfully shared the feast of China's high-speed rail construction.
Drilling BOP And Control System
During oil drilling, it is installed on the wellhead casing head to control high-pressure oil, gas, and water blowout devices. When the oil and gas pressure in the well is high, the blowout preventer can close the wellhead (shut down). When the heavy mud is pressed into the drill pipe, there is a four-way under the ram, which can replace the mud invaded by gas, increase the pressure of the liquid column in the well, and suppress the ejection of high-pressure oil and gas.
Its types are divided into ordinary blowout preventer, universal blowout preventer and rotary blowout preventer. The universal blowout preventer can be activated in emergency situations to deal with any size of drilling tools and empty wells; the rotary blowout preventer can realize the blowout and drilling operation. In deep well drilling, in addition to two ordinary blowout preventers, universal blowout preventers and rotary blowout preventers are often added, so that three or four combinations are installed at the wellhead.
Annular Blow-out Preventer Annular Blow-out Preventer is usually equipped with a large gate with a ram-type blowout preventer. During operation, a sealed annular space is formed between the pipe string and the wellbore. When there is a pipe string in the well, it can also be separated The well is closed, but it will not work after several times of use, and long-term shut-in use is not allowed.
Drilling BOP And Control System,Double ram blowout preventer, single ram blowout preventer, annular blowout preventer, blowout preventer control system
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