At present, with the expansion of oil pipelines, the task of protecting them has become increasingly challenging. The high profits from oil theft have led to frequent incidents where thieves drill into pipelines, causing repeated leaks and shutdowns, which pose a serious threat to pipeline safety. Traditional methods like civil air defense are not sufficient due to their lack of sensitivity, reliability, and accuracy, making it difficult to detect and locate leaks quickly. To address this issue, Chinese researchers have developed an advanced pipeline leak monitoring system. The system works by detecting negative pressure waves that travel through the pipeline when a leak occurs. By analyzing the time difference between upstream and downstream sensors, the system can accurately determine the location of the leak. It provides timely alarms and can pinpoint leaks within approximately 500 meters. This level of precision is crucial for rapid response and minimizing damage. This system was first tested in 2005 on the Qinjing line, where it successfully detected a leak near pile No. 218, just 700 meters from the actual location, with an error of only 100 meters. In 2006, after installing the system on the Qingtie Line, it helped prevent an oil theft by identifying and stopping a stolen oil truck. Initially, the system was mainly used for crude oil pipelines, where the negative pressure wave method was reliable but not highly sensitive. In 2008, the system was upgraded by integrating sound wave technology, improving both accuracy and speed. This enhanced version proved very effective. That same year, the system helped locate a stolen oil valve near pile No. 193, significantly reducing the response time for theft incidents—from one hour in 2007 to just two minutes in 2008. By 2013, researchers had further improved the system by combining the negative pressure wave method with flow balance analysis, allowing it to detect both sudden and slow leaks. These advancements brought the technology to an international standard. The successful implementation of the system has greatly enhanced pipeline safety and provided significant social and economic benefits. In response to this progress, the State Administration of Work Safety now requires all China National Petroleum Corporation pipelines to install such monitoring systems. Recently, breakthroughs in natural gas leak detection have also been made, with researchers developing a system based on infrasound waves. This innovation fills a gap in both domestic and international research, marking a major technological achievement.

Head Truck Tractor

Tractor, Head Tow Truck

Tractor, Head Tow Truck, Front drive capability called the front tractor, rear no traction drive capability of the car called the trailer, tractor trailer is pulled along. Tractor and trailer is connected in two ways: The first is the front half of the trailer after the tractor ride in the section above the saddle traction, tractor trailer behind the bridge to withstand the weight of the part, which is the tractor; second species is the front end of the trailer attached to the rear end of the tractor, the tractor only pull forward, dragging the trailer to go, but do not bear the weight of the trailer down, which is all linked.

Tractor, Head Tow Truck principle

Tractor, Head Tow Truck Traction Control System Traction Control System, referred to as TCS, also known as ASR or TRC. Its role is to make the car under various traveling conditions can get the best traction. Traction control system control device is a computer, the computer detects the use of four wheel speed and steering angle of the steering wheel when the car is accelerating, if it detects that the drive wheel and non-driving wheel speed difference is too large, the computer immediately determine the driving force is too large issuing a command signal to reduce the amount of oil the engine, reducing the driving force, thereby reducing the driving wheel slip rate. Computer control through the steering wheel steering angle sensor driver intent, then use the left and right wheel speed sensor detects the left and right wheel speed difference; in order to determine whether the degree of steering the car and the driver's steering intention of the same. If the car detects understeer (or oversteer), the computer immediately determine the driving force of the drive wheel is too large, it issued a directive to reduce the driving force, in order to achieve the driver's steering intention.

Tractor, Head Tow Truck Traction control system to prevent the vehicle driving on snow and other slippery surfaces the driving wheel idling, the vehicle can smoothly start and accelerate. Especially in snow or muddy road, traction control system can ensure the smooth acceleration, to prevent the vehicle wheel slip occurs due to sliding or drift.

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