Liquid oxygen is a vital combustion-supporting medium in industrial production, and its storage safety is crucial to the core security of personnel and property within the plant. The safety distance for liquid oxygen tanks serves as a critical barrier against fires, explosions, and secondary disasters. Based on current national standards and industrial practical requirements, the layout of liquid oxygen tanks must strictly comply with regulations. The core control points are as follows.
1. Core Conversion Principles and General Safety Distance Standards
According to Article 4.3.4 of the Code for Fire Protection Design of Buildings (GB 50016-2014, 2018 Edition), the fire protection distance for liquid oxygen tanks requires volume conversion: 1m³of liquid oxygen = 800m³ of gaseous oxygen under standard conditions. After conversion, the standards for wet oxygen storage tanks shall apply.
Except for special medical scenarios, the general distance requirements for industrial and civil scenarios are as follows:
Building Distance: Shall be implemented according to the national standard fire protection distance for wet oxygen tanks corresponding to the converted volume.
Inter-tank Distance: The distance between adjacent oxygen tanks shall not be less than 1/2 of the diameter of the larger tank.
Distance from Combustible Gas Tanks: Shall not be less than the diameter of the adjacent larger tank to avoid the risk of combustion-supporting explosions.
Distance from Oxygen Production Plants: Can be flexibly determined based on the on-site process layout.
Distance from Pump Rooms: The distance between the storage tank and the supporting pump room shall not be less than 3m.
2. Compliance Rules for Reduced Distances in Special Scenarios
National standards provide distance exemption clauses for small supporting storage tanks, which can optimize the land utilization rate of the plant area under the premise of ensuring safety.
(A) Liquid Oxygen Tanks with Total Volume ≤ 3m³
For small liquid oxygen tanks serving only exclusive buildings, the fire protection distance can be reduced as needed:
When arranged in an independent, dedicated building with Grade I or II fire resistance rating, the distance shall be ≥ 10m.
If the side of the dedicated building facing the user building is equipped with a firewall without openings, the fire protection distance is unlimited.
After the storage tank is equipped with complete fire protection measures, the minimum distance can be reduced to 5m.
(B) Gaseous Oxygen Tanks with Volume ≤ 50m³
For oxygen tanks of 50m³ and below that are exclusively supporting a plant building, the fire protection distance from the affiliated production plant is unlimited.
3. Environmental Control of Restricted Zones Around Storage Tanks
According to Article 4.3.5 of the national standard, the 5-meter range around a liquid oxygen tank is an absolute safety restricted zone, where the stacking of combustibles and the installation of asphalt pavement are prohibited.
After a liquid oxygen leak, it easily reacts violently with asphalt and organic matter, triggering combustion and explosion accidents. The ground in this area must be paved with non-combustible concrete materials, which is a key inspection item for on-site patrols and compliance acceptance.
4. Equipment Intrinsic Safety Control
Safety distance belongs to external protection, while the quality of the storage tank equipment is the core foundation of safety. The vacuum degree, thermal insulation performance, and manufacturing process of the tank directly avoid common operational hazards such as vacuum failure, shell frosting, and excessive liquid oxygen evaporation rates.
DOER cryo-equipment focuses on the manufacturing of cryogenic storage tanks. Its liquid oxygen tanks adopt vacuum multi-layer insulation technology, featuring advantages such as low evaporation rate, high strength, and high sealing performance, making them adaptable for long-term stable operation in complex industrial environments. High-quality storage tanks build a strong line of defense for intrinsic safety from the source, providing solid guarantees for the compliant layout and safe operation of the plant area.
5. Conclusion
The safety layout of liquid oxygen storage tanks is a systematic control task. Enterprises must strictly benchmark against national standards, regulate safety distances for various scenarios, and strictly adhere to the 5-meter red line prohibiting fire and oil; at the same time, they should prioritize high-quality storage tank equipment and implement intrinsic safety requirements. By combining scientific layout, strict control, and reliable equipment to form multiple layers of safety assurance, a solid line of defense for safe production in the plant area can be established.