Calculation method for leakage equivalent diameter of small gas holes of gas transmission pipe network in region

The invention discloses a method for calculating the leakage equivalent diameter of a gas small hole of a gas transmission pipe network in a region, and the method is characterized in that the method comprises the following steps: S1, obtaining the wind speed and direction in the region through an anemorumbometer when the combustible gas leakage occurs in the gas transmission pipe network in the region, determining the leakage diffusion direction of the combustible gas, and calculating the leakage equivalent diameter of the combustible gas; observing the weather condition, the cloud layer height and the sky cloud amount in the area, and determining the atmospheric stability; s2, determining two vertical planes which are n meters away from each other in an area in the diffusion direction, dividing the planes into grids according to # imgabs0 #, and measuring the concentration value of leaked combustible gas on each grid by using a combustible gas concentration detection instrument; s3, determining the maximum