[Haichuan Safety Case] Water jet cutting to remove pipelines from the coal-to-gas synthesis project at Yangzi Petrochemical Plant

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Due to plant renovation, Yangzi Petrochemical needs to remove three different types of pipelines. ? 1. Diameter 100mm, wall thickness 8mm; the residual gas inside is carbon ten (a highly flammable liquid with a high flash point; its vapors can form explosive mixtures with air, and it poses a risk of combustion and explosion when exposed to open flames, high temperatures, or oxidizing agents) ； 2. Diameter 600 mm, wall thickness 10 mm, height from the ground level 12 m; contains residual production waste gases such as propylene, ethylene, acetylene, and CO ； 3. Diameter 1320 mm, wall thickness 12 mm, height from the ground level 12 m; contains residual production waste gases such as propylene, ethylene, acetylene, and CO ； ???: There are flammable and explosive gases remaining inside all three types of pipes; therefore, no open flames or sparks must be generated during construction, and no significant temperature changes are allowed, in order to prevent fires and explosions. Furthermore, due to the high height of the pipes and the fact that operations are carried out within the factory premises, the on-site environment is complex, making construction difficult and hazardous; it is therefore essential to ensure safe cutting. After examining the site conditions, the technicians decided to use portable water cutting equipment for the operation.