Abstract: To improve the suppression and protection level of explosion accidents in connected structural devices in industrial production,laboratory experiments were carried out to study the methane-air mixed gas venting process in the connected containers of two spherical vessels and pipes.By changing the opening and closing state of the two venting ports on the device,the changes in pressure in the container during the explosion were observed.The results show that for the explosion in the connected structure device,the explosion venting facility has a certain protective effect,that when only one port works,pressure fluctuations may occur in the connected container and when the two ports work,the pressure curve in the smaller container will have a double peak phenomenon,and that in the case of the same pressure relief ratio,an increase in the venting area makes the pressure in the connected vessels decrease significantly.

Key words: linked vessels, single/double nozzles explosion venting, pressure oscillation, double pressure peaks, effective vent area