Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) was established in 2001, located at No. 2218 Jinnan Road, Development Zone, Heze City, with a registered capital of 50 million yuan and total assets of 500 million yuan. The company has 7 business centers: boilers, deep-freeze containers, pressure vessels, central air conditioning, engineering installation, international trade, and Internet of Things. It has three factory sites on Jinnan Road, East Changjiang Road, and Bohai Road, covering a total area of 200,000 square meters, with the main workshop spanning 83,000 square meters. It currently employs 710 staff, including 247 engineering and technical personnel and 82 intermediate-level technicians. In December 2016, it was recognized as a "High-tech Enterprise" by the Science and Technology Department. In June 2021, it was identified as a "Specialized and New Enterprise in Shandong Province" by the Ministry of Industry and Information Technology. In June 2022, it was recognized as a "Gazelle Enterprise in Shandong Province" and in August 2022, as a "Specialized and New Small Giant Enterprise" by the Ministry of Industry and Information Technology.
The safety distance between liquid oxygen storage tanks and buildings is typically governed by relevant safety standards and regulations to ensure the safe distance and fire separation between the tank and the building. The following is a reference for the general safety distance between liquid oxygen storage tanks and buildings:
Horizontal Clearance: The horizontal clearance between the liquid oxygen storage tank and the structure is typically required to maintain a certain distance to prevent any danger to the structure in case of tank leakage or accidents. The specific clearance distance should be determined based on factors such as the tank's capacity, pressure, and the nature of the structure, with a general recommendation to maintain a safe distance.
Vertical clearance: The vertical distance between the liquid oxygen storage tank and the building must also comply with relevant safety requirements. This is to prevent any danger to the building in case of tank leakage or accidents. Specific clearance requirements will be determined based on factors such as the tank's capacity, pressure, and the height of the building, generally recommending maintaining a certain safety distance.
Fireproof Separation: Liquid oxygen has a high oxygen content and flammability, which may cause fires upon leakage or accidents. Therefore, a certain fireproof separation is required between liquid oxygen storage tanks and buildings to ensure that fires do not spread or pose a danger to the structures. Specific fireproof separation requirements

Liquid nitrogen tanks are widely used in various industries, primarily in the following aspects:
Industry: Liquid nitrogen tanks are used in the field for storing and supplying liquid nitrogen, which is essential for low-temperature cryopreservation of biological samples, cells, tissues, and vaccines. These tanks are widely employed in biopharmaceutical research institutions and biobanks, among other organizations.
Experimental Research: Liquid nitrogen tanks are used in scientific research and laboratories to provide low-temperature environments, for cryopreservation and cryogenic experiments. Liquid nitrogen tanks play a crucial role in experimental research across various fields, including physics, chemistry, biology, and materials science.
Metalworking Industry: Liquid nitrogen tanks are used in the metalworking and welding industries for providing low-temperature cooling, used in processes such as metal cutting, welding, and heat treatment. Liquid nitrogen tanks can provide low temperatures, enabling metals to achieve the required hardness and toughness during the processing.
Food Industry: Liquid nitrogen cylinders are used in the food industry for freezing and refrigeration of foods, such as frozen meats, frozen fruits, and frozen seafood, etc. The low temperature of liquid nitrogen can quickly freeze foods, maintaining their freshness and quality.
Semiconductor Industry: Liquid nitrogen tanks are used in semiconductor manufacturing and the electronics industry to provide a low-temperature environment, for the freezing and preparation of semiconductor materials. The low temperature of liquid nitrogen can enhance the purity and performance of semiconductor materials.
The configuration of liquid nitrogen tanks typically includes the following aspects:
Tank Structure: Liquid nitrogen tanks typically feature double or multi-layer construction, filled with insulating material in the middle to minimize heat transfer and evaporation of liquid nitrogen. The tank material is usually stainless steel or aluminum alloy, offering excellent corrosion and low-temperature resistance.
Insulation Layer: The insulation layer of liquid nitrogen tanks typically employs multi-layered insulation materials such as polyethylene foam, glass fiber, and vacuum layers, to minimize heat transfer and evaporation of liquid nitrogen.
Temperature Control System: Liquid nitrogen tanks are typically equipped with a temperature control system to regulate the tank's temperature, ensuring the maintenance of the liquid's state.

To prevent the explosion of liquid oxygen tanks, the following measures can be taken:
Regular Inspections and Maintenance: Conduct regular inspections and maintenance of the liquid oxygen storage tank, including checking the tank's exterior, welds, valves, and fittings, to ensure they are intact and undamaged. Regularly clean the tank to remove any impurities and dirt adhering to its surface.
Pressure Control: Storage tanks should be equipped with pressure control devices to ensure internal pressure remains within a safe range. Regularly inspect and adjust the pressure control devices to ensure proper operation.
Temperature Control: The liquid oxygen tank should be maintained within an appropriate temperature range to prevent excessive heat from causing pressure increase. Ensure the insulation layer of the tank is intact to minimize heat conduction and loss.
Fire Prevention Measures: Liquid oxygen has a high oxygen content and flammability, thus strict fire prevention measures are necessary. A fire isolation zone should be established around the storage tank, with smoking and open flames prohibited. Ensure the storage tank maintains a certain fire separation distance from other facilities.
Pressure Relief Devices and Safety Valves: Liquid Oxygen Tanks should be equipped with pressure relief devices and safety valves to prevent overpressure and sudden pressure increases. Regularly inspect and test the operational status of the pressure relief devices and safety valves to ensure their proper functioning.
Tank Operation Guidelines: Adhere strictly to the operational specifications and safety requirements for liquid oxygen tanks. Operators must be trained and familiar with the tank's characteristics and operation techniques. Avoid operational errors and violations.
Emergency Preparedness: Establish emergency response plans and conduct drills to address potential accidents. Train operators in emergency response capabilities to ensure timely and effective actions.

Prior to cooling the liquid oxygen tank, the following prerequisites must be met:
Clean Tanks: Ensure the interior of the tank is clean, free of impurities and contaminants. The tank should be properly cleaned and flushed to maintain its internal cleanliness.
Drainage and Exhaust: Empty the gas inside the tank and expel it through the exhaust system to reduce the gas content within the tank. This helps minimize interference of the gas on the cooling process.
Safety Precautions: Necessary safety measures must be taken prior to cooling the liquid oxygen tank. Liquid oxygen is highly flammable and has low-temperature properties, so operators should wear appropriate protective clothing, gloves, and other personal protective equipment to ensure safe operation.
Temperature Control: During the cooling process of the liquid oxygen storage tank, the temperature of the tank must be controlled. Typically, low-temperature media such as liquid nitrogen are used to cool the tank, ensuring that the tank's temperature gradually drops below the boiling point of liquid oxygen.
Insulation and Heat Retention: Liquid oxygen tanks are typically designed with double or multi-layer structures, filled with insulating material in between to minimize heat transfer and evaporation of the liquid oxygen. Ensure the integrity and excellent insulation of the insulating layer to enhance the cooling efficiency of the tank.
Under the above-mentioned preliminary conditions, the cooling operation of the liquid oxygen tank may proceed. The cooling process must strictly adhere to relevant safety regulations and operational guidelines to ensure the safe operation and usage of the tank.
Our company attaches great importance to technological innovation and R&D design. We have one municipal-level enterprise technology center in Heze City, equipped with testing facilities such as non-destructive testing, physical and chemical testing, welding testing, and hydrostatic testing. We have over 600 types of equipment including CNC machine tools, X-ray flaw detectors, digital ultrasonic flaw detectors, mechanical property testing machines, chemical analyzers, spectrometers, tensile testing machines, plasma welding machines, and more. The key products we have developed, such as temperature and pressure vessel welding, biomass boiler emissions reduction, and waste heat utilization, have successively been selected for multiple Shandong Provincial Department of Industry and Information Technology science and technology innovation projects, Shandong Provincial key projects, and Heze City innovation and excellence projects. We have accumulated a total of 27 authorized utility models, 16 authorized inventions, participated in drafting 2 standards, 2 industry standards, and registered 15 trademarks. The technical team of our company, in collaboration with Professor Yajiang Li of Shandong University, has developed deep cryogenic container processing technology using the international plasma arc + filler wire tungsten inert gas arc welding (PAW-GTAW) technique. This technology has been appraised as reaching international standards in the field of deep cryogenic container manufacturing at the provincial level. Choose Zhongjie Special Equipment, and let's create brilliance together!