Literature results showed that pressure piling phenomenon is the result of the combination of: a) the precompression effect due to the jet flow from the ignition - vessel); b) the turbulence induced by the fast flame propagation (jet ignition) in the secondary vessel; c) the vent flowing towards the ignition vessel which mitigates the peak pressure. To control the severity of explosion in the second vessel it is then possible to either limit pre-compression or to reduce the characteristic ratio between the “reaction” time and “venting”. In the present paper a mathematical model of pressure piling phenomenon is proposed to study the possibility of redcuing the peak pressure in the second vessel by limiting the turbulence level induced and thus increasing the reaction time with respect to the venting time. More precisely, the effect of geometry obtained by using divergent connection tubes from the ignition vessel to the second vessel and by varying the volume ratio between the two compartment has been evaluated, demonstrating that small variation in the design are able to annihilate the catastrophic behaviour of pressure piling.