Home / Standards / GB 50493-2009 GB 50493-2009 Specification for Design of Combustible Gas and Toxic Gas Detection and Alarm Systems in Petrochemical Industry 石油化工可燃气体和有毒气体检测报警设计规范 Standard Type GB ICS N/A CCS N/A Status N/A Issue Date N/A Implementation N/A Responsible Dept N/A Drafting Unit N/A