Abstract: The construction of long-distance transportation natural gas pipeline system is to achieve the purpose of long-distance pipeline transportation of natural gas, so that users along the line can obtain the required gas volume to meet the needs of users.
The construction of long-distance transportation natural gas pipeline system is to achieve the purpose of long-distance pipeline transportation of natural gas, so that users along the line can obtain the required gas volume to meet the needs of users. The procedures for pipeline construction are complicated. Long-distance pipeline systems are generally buried pipelines. Pipe trenches need to be dug. For special pipeline systems such as rivers and residential areas, optimization design is needed to ensure the quality of pipeline construction and to extend pipeline use. Life expectancy to ensure safe and smooth delivery of natural gas. The key technology is the welding technical measures of the pipeline. According to the conveying distance of the long-distance pipeline, the welding pipeline forms a continuous hydraulic system to ensure the quality of the welding construction, and the welding quality is checked to avoid welding defects. The cathodic protection design of the pipeline system is carried out to reduce the corrosion of the pipeline. According to the requirements of the design drawings, the pipe valve, elbow and other equipment are connected to realize the effect of the distribution and meet the needs of long-distance pipeline transportation of natural gas.
Risk identification of long-distance natural gas pipelines
(1) The nature of the transport of natural gas.
The risk we refer to refers to the combination of the possibility and consequences of a specific hazard event. The root cause and form of the hazard hazard are identified through hazard identification, and reasonable prevention and control measures are formulated according to the nature. The medium transported by the pipeline is natural gas. The main component of natural gas is methane, which is flammable. Once the pipeline leaks, it will spread rapidly and easily cause explosion and combustion. When the natural gas content of the air reaches a certain proportion, it will explode in the fire, causing casualties and property losses.
(2) What is the main construction risk?
First, an irresistible natural disaster occurs. Natural gas encounters earthquakes, mudslides, ice, floods, landslides, etc. during the transportation process, which damages the body of the natural gas pipeline, causing the pipeline to break or be damaged, resulting in natural gas leakage. This hazard is huge and unpredictable. We need to fully understand the local natural conditions and weather conditions in construction and pipeline operations, and familiar with the characteristics of soil vegetation, water protection facilities, weather changes, and minimize the impact of natural disasters.
Second, third-party damage, man-made unconscious destruction, theft, close fire, illegal construction, terrorist attacks and other pipeline accidents. By observing the living and production environment around the station and the line to determine whether there are risk factors that endanger the station and the line.
The third is illegal operation. Due to the nature of pipeline construction, high risk such as restricted space, excavation work, high-altitude operation, mobile hoisting operation, pipeline opening, temporary power consumption, hot work, etc., due to the characteristics of field construction, The impact of various extreme climatic conditions and complex geological conditions on safety is almost always present. The violation of regulations and illegal operation of personnel may cause major accidents in pipelines and stations. Through safety production rules and regulations to check whether there are dangers in various operational behaviors.
Fourth, corrosion, corrosion of pipelines, equipment, and installations in the surrounding environment may cause large-scale leakage of natural gas pipelines, station natural gas, and fire and explosion accidents. Determine the risk of potential hazards by regularly checking the wall thickness of the pressure vessel equipment and piping and the external corrosion of the equipment.