The "Petrochemical Combustible Gas and Toxic Gas Detection and Alarm Design Standard" is now approved as a national standard, numbered GB/T50493-2019, and will be implemented from January 1, 2020. The original national standard "Petrochemical Combustible Gas and Toxic Gas Detection and Alarm Design Code" (GB50493-2009) will be abolished at the same time. This standard is published on the website of the Ministry of Housing and Urban-Rural Development (www.mohurd.gov.cn), and is published by the China Planning Publishing House organized by the Institute of Standards and Quotas of the Ministry of Housing and Urban-Rural Development. Ministry of Housing and Urban-Rural Development of the People's Republic of China September 25, 2019
GB/T 50493-2019 history
2019GB/T 50493-2019 Petrochemical industry combustible gas and toxic gas detection alarm design standards
2009GB 50493-2009 Specification for design of combustible gas and toxic gas detection and alarm for petrochemical industry