A Method for Assessing the Explosion Hazard of Natural Gas Pipeline
A natural gas pipeline and hazard range technology, applied in the pipeline system, gas/liquid distribution and storage, mechanical equipment, etc., can solve problems such as damage, threat to pipeline service safety, public safety threats in oil and gas pipeline laying areas, and achieve the goal of reducing hazards Effect
Active Publication Date: 2019-05-07
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology
Since natural gas and air are fully and evenly mixed, the ignition process is extremely violent, and the speed of the flame front can reach 50-100m / s, forming a deflagration, and releasing a large amount of heat radiation to the surroundings, causing great damage to personnel, buildings and installations, and seriously threatening the safety of pipeline service. As a result, it poses a great potential threat to public safety in the area where oil and gas pipelines are laid
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[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0028] A method for assessing the explosion hazard of a natural gas pipeline provided by the present invention is suitable for the hazard assessment of a leak in a high-pressure natural gas pipeline and then a vapor cloud explosion, and specifically includes the following steps:
[0029] 1) Install shock wave and thermal radiation sensors at different distances from the steel pipe to obtain the shock wave and thermal radiation values at different positions from the fireball; use the pressure values of the shock wave at different positions and compare it with "Safety Evaluation Method Application South" to estimate Exclude the scope of the shock wave's harm to people. Using the equation of thermal radiation damage, the thermal radiation hazard probability unit for burns or death at different locations within a specific time range can be calc...
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The invention discloses a method for estimating explosion harm of a natural gas pipeline. The method comprises the steps of firstly, obtaining impact waves and thermal radiation values of different positions away from a fire ball; by means of pressure values, at the different positions, of the impact waves, obtaining the impact wave harm range to people through estimation; by means of the thermal radiation harm equation, calculating thermal radiation harm probability units at the different positions within a specific time range; according to the thermal radiation harm probability units, obtaining thermal radiation influence ranges; and comparing the impact wave harm range to people with the thermal radiation influence ranges, and thus determining that the large thermal radiation influence range is the safety distance of the pipeline of the specification. According to the method for estimating explosion harm of the natural gas pipeline, impact wave influence caused by gas expansion generated when the natural gas pipeline explodes is considered, and thermal radiation harm influence caused by natural gas combustion and explosion is also considered; by means of an estimation result, the explosion safety distance of the natural gas pipeline can be determined precisely; harm caused by failure of the pipeline is reduced; technical support and theoretical basis are provided for pipeline construction; and important engineering application value is achieved.
Description
technical field [0001] The invention relates to the field of pipeline hazard protection, in particular to a method for evaluating the explosion hazard of a natural gas pipeline. Background technique [0002] During the service of natural gas pipelines, due to geological disasters, corrosive media, human factors, quality problems, etc., the pipelines may break, deform, age, corrode, etc., resulting in pipeline leakage and serious consequences. [0003] After the natural gas pipeline leaks, due to the high pressure inside the pipe, a large amount of gas will escape from the leak point, and at the same time, cracks will expand at the leak location, which will accelerate the gas leak process. Due to the rupture of the pipeline and the rapid expansion of the natural gas gas, a violent physical explosion will be formed, and a strong shock wave will be generated, causing serious harm. [0004] After a high-pressure natural gas pipeline leaks, due to the high internal pressure and ...
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IPC IPC(8): F17D5/00F17D5/02
CPCF17D5/005F17D5/02
Inventor 杨坤沙婷杨明张伟卫李鹤胡美娟
Owner BC P INC CHINA NAT PETROLEUM CORP