Influence of different pressure relief conditionson explosion pressure in square pipeline

In this work we carried out vented explosion experiments with different pressure relief membrane material and layers and different venting locations in the square flame propagation test pipeline and investigated the influence of pressure relief membrane constraints on explosion pressure's characteristics of premixed methane/air gas using the pressure sensor to measure the peak overpressure under various experimental conditions in the pipeline and comparing their venting effects. The results showed that there is a linear relationship between the maximum explosion pressure and the number of relief membrane layers made of the same material. The maximum explosion pressure in the pipeline increased by 11.2% and 12.3% respectively for each additional pressure relief membrane layer of kraft paper and polypropylene film. As the venting location approached the ignition end, the maximum explosion pressure in the pipeline showed a "Z" pattern with different pressure relief membrane strengths. When the venting location was set at 0.25 m from the trailing end, the minimum value was observed for each curve. When the venting location was set at 0.50 m from the trailing end, each curve reached its maximum value. © 2019, Editorial Staff of EXPLOSION AND SHOCK WAVES. All right reserved.