Chengdu: Laser inspection car found gas leaks on the alarm

On the morning of the 28th, a yellow laser patrol car was driving at a speed of 10 to 20 kilometers per hour near the Shahe Bridge in Xinchengren Road, Chengdu. Suddenly, warnings were issued on the on-board computer, and the concentration of nearby natural gas was abnormal. After the inspector confirmed the review with the handheld instrument, he immediately called the emergency call. “The gas leak occurred on the left side of the Xinheren Road Shahe Bridge.” The rescue personnel quickly rushed to the scene... Yesterday, Chengdu Gas Company conducted gas rescue drills. The new equipment was introduced.

He Yibing, deputy general manager of the gas company pipe network branch, said that the gas laser inspection vehicle was imported from the United States and was worth 1.6 million yuan. It was officially put into use in May. At present, there are two gas companies. "One of the advantages of this car is fast." He told Chengdu Business Daily that no matter whether it is a gas leak in a city main road, a sidewalk or a green belt, it can be detected by the laser at the front bumper. This infrared laser reacts only to methane, which is the main component of natural gas used in Chengdu. When the concentration of natural gas contained in the air increases to 20 parts per million, it can be accurately detected. However, because the biogas also contains methane, the inspectors also need to use a hand-held instrument ethane analyzer to repeatedly detect the area within 100 meters to separate the natural gas from the biogas, and then determine whether there is a valve well leak.

After identifying the leaking valve well, the rescuer opens the valve manhole cover and uses a blower to change the valve well. After testing, the valve well concentration is below the lower limit of explosion of 20%, and when the oxygen content is qualified, the rescuer wears a respirator and wears a safety belt to find the leak point. According to reports, the respirator worn by the rescuers is the first air-supplied respirator in the southwestern region. Compared with the previous operation of carrying down the oxygen tube, this respirator imported from Japan is light and saves time, not only preventing poisoning, but also Can avoid hypoxia.

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