A small scales experimental study on multi- source leakage and diffusion of heavy gas has been developed, and the effects for the multi- source heavy gas leakage of the leakage source distance have been considered with a reference critical value. The results show that with various leakage source distance, the law of gas concentration changing with the diffusion distance basically conforms with the exponential decay function. A linear relationship shows between the gas concentration and the leakage source distance near the sources. When the aperture ratio is less than 30, the
concentration of gas near the sources decreases, the concentration decreasing rate reduces and the gas diffusion range increases with the leakage source distance increases. When the aperture ratio is more than 30, there is no mixing near the leakage source, and the attenuation trend of gas concentration cannot fit the exponential decay function, and it can be considered as two single source leakage of heavy gas.
