The overpressure generated in a 10 L cylindrical vented vessel with an LID of 2.8 was investigated, with end ignition opposite the vent, as a function of the vent static burst pressure, P-stat, from 35 to 450 mb. Three different K-v (V-2/3/A(v)) of 3.6, 7.2 and 21.7 were investigated for 10% methane-air and 7.5% ethylene air. It was shown that the dynamic burst pressure, P-burst, was higher than Pstat With a proportionality constant of 137. For 10% methane-air P-bursr was the controlling peak pressure for K P-burst in the literature and in EU and US standards. For higher K-V the overpressure due to flow through the vent, P-fv, was the dominant overpressure and the static burst pressure was not additive to the external overpressure. Literature on the influence of Pstat at low K, was shown to support the present finding and it is recommended that the influence of Pstat in gas venting standards is revised. (C) 2015 Elsevier Ltd. All rights reserved.