Hazardous gas areas on high-pressure gas pipelines in poland Łukasz Zabrzeski, Łukasz Drążkiewicz, Krystian Liszka, Mariusz Łaciak and Piotr Paszylk MATEC Web Conf., 121 (2017) 09010 Published online: 09 August 2017 DOI: 10.1051/matecconf/201712109010