Anhui Star Control Instrument Co., Ltd.

Anhui Star Control Instrument Co., Ltd.

Causes and types of natural gas leakage at GNG filling stations

Causes and types of natural gas leakage at GNG filling stations
Abstract: The natural gas leakage accident of CNG gas station is very easy to occur, and it may cause great harm. This paper describes the natural leakage of gas station, its causes and consequences, as well as the diffusion mode, speed and quantity of natural gas leakage. The scope and gas depth detection methods have been analyzed, and it is hoped that it will help to prevent CNG gas and gas station gas leakage.
Key words: GNG natural gas; prevention
1 Causes and types of natural gas leakage at GNG filling stations There are many reasons for natural gas leakage accidents at CNG filling stations. For example, the pipeline pressure changes too much, the sealing work is not in place, the material quality of the well is the technical indicators, and the parts are aging. It is one of the reasons for the natural gas leakage in CNG. According to some surveys, the incidence of natural gas leakage from equipment and pipelines ranks first, accounting for about half of all hidden dangers.
1.1 Pressure changes are large
In the natural gas transportation pipeline, the pressure changes greatly, so that it is easy to cause the piles and other piles to check the auxiliary, such as the pressure of the machine experienced loading, the number of payloads,
1.2 The temperature and temperature deviation is large, and the temperature changes frequently; the compressor increases from the normal temperature to 150 degrees, and the gas seller rises from the normal temperature to 60 degrees Celsius, which are factors that cause loose parts and aging parts.
1. 3 Large amplitude of vibration
When the compressor is used for starting up, there will be vibrations with a high frequency and a large amplitude, which will easily cause the looseness of the welded joints, bolts and joints of the compressor, and the use of the gas distributor is frequent and easy to make. The filler connector is loose and the card sleeve is cracked. Foundation settlement, unscientific layout, and equipment and piping installation techniques will cause vibrations in facilities and pipelines.
1.4 Equipment is corroded
CNG filling station equipment is often corroded, and natural gas leakage may occur.
1.5 The quality of the design equipment is not up to standard
In the construction of pipeline equipment of CNG filling stations, the quality of equipment selection parts and components are not in accordance with the prescribed standards, and the installation welding technology is not enough. These are the causes of natural gas leakage.
2 Precautions for natural gas oil leakage
2. 1 Stabilizing the infrastructure
Strengthen the construction of infrastructure, stabilize it, prevent the occurrence of settlements in the foundation, and strictly follow the design plan and construction and quasi-implementation of the workpiece project.
2. 2 Scientific and reasonable equipment installation
Equipment installation is the most important factor in preventing natural gas leakage at CNG refueling stations. It must be strictly implemented according to relevant standards when piping is connected. It is especially important for equipment selection. It is necessary to select quality installation materials for installation. After the good, the equipment and pipelines will be checked and the installation of the 2. 3 installation detection and alarm device will be able to check the CNG gas station's natural gas leakage in a timely and effective manner. This requires a CNG filling station. The compression zone, the gas storage zone, and the gas sales zone are installed with natural inspection and alarm devices. It is important to confirm that these devices are installed and can operate normally and effectively.
3 Analysis of safety technical problems of CNG filling stations
3. 1 Classification of safety accidents
In the survey samples of 60 CNG filling stations, more than 90 safety accidents occurred in recent years, and these accidents were classified into major safety accidents and general accidents according to national standards and loss levels. Analysis of the cause of the accident There are product quality problems, natural corrosion, detachment of the ferrule, freezing of the winter pipeline, etc., in which the safety pull-off effect results in leakage of high-pressure pipe fittings is the main cause of the accident. The following table is an overview of the overall type of accidents at CNG filling stations.
3. 2 gas dispenser quality problems and cylinder testing problems
According to the investigation, it is found that the high-pressure pipe of the air-filling gun is broken due to the operation error of the refueling personnel or driving the driver of the CNG car, which is the main cause of the safety accident. Some gas-filled hose lines fail to provide safe pull-off treatment, and some gas-filled steel ball-positioned structural quick-change joints replace the pull-off flash, and the pull-up force of this quick-ch
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