For the classification of major hazard sources, experts said that the division of the old standard to the unit is the device, facility and place within the absolute distance. This division has its unreasonable meaning, and the definition is relatively vague and simple. The new version solves this problem, and the definition is more scientific and reasonable, and the operability is enhanced. The major hazard sources are divided into production units and storage units, respectively. The production units include production facilities and facilities. The shut-off valves are divided into separate units as dividing boundaries. The storage units include tank areas and warehouses, and the tank areas are fire-proof in tank areas. The dike is divided into separate units, and the warehouse is divided into independent units by independent warehouses (independent buildings). At the same time, a flow chart for identifying major hazard sources is given in Appendix A.
In addition, according to expert analysis, the new standard also addresses the controversy of actual presence and the handling of mixtures. Previously, the industry has been controversial about whether the actual amount of hazardous chemicals is determined by existing quantity, facility limit or design maximum. The new standard clarifies that the actual amount of hazardous chemicals is determined according to the maximum amount of design. At the same time, the treatment of dangerous chemical mixtures is also clarified: if the mixture is in the same hazard category as its pure substance, it is considered pure and is calculated as a whole; if the mixture is not in the same hazard category as its pure substance, it should be The hazard category considers the critical mass.
Finally, the new version of the standard supplements the grading indicators and calculation methods for major hazard sources. The “Hybridification Standards for the Supervision and Management of Major Hazardous Sources of Hazardous Chemicals (2015 Revision)” is integrated into the method of grading major hazard sources. The value of the turbidity gas correction coefficient varies, and the exposed personnel a correction factor, major hazard source and R value correspond. The relationship has not changed.www.wxytgas.com