GB 50160-2008 (2018 Edition) "Code for Fire Protection Design of Petrochemical Enterprises"
7.2.16 For pipelines transporting combustible gases, liquefied hydrocarbons, or combustible liquids into or out of a process unit, isolation valves and spectacle blinds (figure-eight blinds) shall be installed at the unit boundary. A platform shall be provided at the location of the isolation valves; for platforms with a length of 8 meters or greater, ladders shall be provided at both ends.
SH/T 3012-2011 "Specification for Layout Design of Metal Piping in Petrochemical Plants"
3.1.20 For pipelines transporting combustible gases, liquefied hydrocarbons, or combustible liquids into or out of a process unit, isolation valves and blinds shall be installed at the unit boundary. A platform shall be provided at the location of the isolation valves; for platforms with a length of 8 meters or greater, ladders shall be provided at both ends.
GB 51283-2020 "Code for Fire Protection Design of Fine Chemical Enterprises"
7.2.2 For pipelines transporting combustible gases, liquefied hydrocarbons, or combustible liquids into or out of a production facility, isolation valves and spectacle blinds (figure-eight blinds) shall be installed at the facility boundary. A platform shall be provided at the location of the isolation valves.
GB/T 20801.1-2025 "Pressure Piping Code - Part 1: Industrial Piping"
G.2 j) For pipelines transporting flammable media into or out of a process unit, isolation valves and spectacle blinds (figure-eight blinds) shall be installed at the unit boundary. A platform shall be provided at the location of the isolation valves; for platforms with a length of 8 meters or greater, ladders shall be provided at both ends.
