Shandong Zhongjie Special Equipment Co., Ltd. (formerly Heze Boiler Factory Co., Ltd.) was established in 2001, located at No. 2218 Jinnan Road, Economic and Technological 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 of 200,000 square meters, with the main workshop area at 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 Department 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.
Liquid oxygen low-temperature storage tanks are primarily used for storing and supplying liquid oxygen. Their application methods can vary based on specific needs and scenarios. Here are some common applications of liquid oxygen low-temperature storage tanks:
Applications: Liquid Oxygen Low-Temperature Storage Tanks are widely used in the field for cryogenic preservation of biological samples, cells, tissues, and vaccines. Institutions such as biopharmaceutical research organizations and biobanks utilize these tanks to store and protect these biological materials.
Experimental Research: Liquid Oxygen Low-Temperature Storage Tanks are used to provide low-temperature environments in scientific research and laboratories, for freezing preservation and cryogenic experiments. These storage tanks play a crucial role in experimental research across various fields such as physics, chemistry, biology, and materials science.
Industrial Applications: Liquid Oxygen Low-Temperature Storage Tanks are used in industrial sectors for providing low-temperature cooling, serving processes such as metalworking, welding, and heat treatment. These tanks can achieve low temperatures, enabling metals to reach the required hardness and toughness during processing.
Food Industry: Liquid Oxygen Low-Temperature Storage Tanks are used in the food industry for freezing and refrigeration of food products, such as frozen meats, frozen fruits, and frozen seafood. The low temperature of liquid oxygen allows for rapid freezing, preserving the freshness and quality of the food.
Liquid oxygen cryogenic storage tanks are used in the field for storing and supplying liquid oxygen as fuel. As a high-energy fuel, liquid oxygen is widely used in the propulsion systems of engines and vessels.
During the operation of liquid oxygen low-temperature storage tanks, it is crucial to strictly adhere to relevant safety regulations and operational guidelines to ensure the safe operation and use of the tanks. Liquid oxygen is highly flammable, so fire prevention measures must be taken when using liquid oxygen low-temperature storage tanks, and it must be ensured that there are no sources of fire nearby.

The use and operation of the liquid oxygen storage tank system require attention to the following points:
Safe Operation: When operating the liquid oxygen storage system, it is mandatory to adhere to relevant safety operating procedures and standards to ensure the safety of the operators.
Tank Selection: Choose liquid oxygen tanks that meet specifications and standards, ensuring their quality and safety performance.
Tank Installation: Tanks should be installed on a solid foundation to ensure stability. Additionally, good ventilation should be maintained around the tank, and it should be kept away from flammable materials and heat sources.
Sealability Inspection: Regularly check the sealing performance of the storage tank system to ensure there are no leakage phenomena at valve and pipe connections.
Pressure Control: Storage tank systems should be equipped with pressure gauges and safety valves, with regular inspections and maintenance to ensure pressure remains within safe limits.
Fire Prevention Measures: Liquid oxygen contains a high oxygen content and is highly flammable. Set up firewalls around the storage tank system, prohibit smoking and open flames, and ensure safety.
Static Protection: During the operation of the liquid oxygen system, static electricity may cause sparks, increasing the risk of fire. Measures such as using static-conductive materials and anti-static equipment are taken to reduce the accumulation and release of static electricity.
Regular Inspections and Maintenance: Conduct regular checks of the storage tank system and related equipment, including valves, pipelines, pressure gauges, etc. Ensure that the equipment is in perfect condition and promptly repair or replace any damaged parts.
Waste Gas Treatment: The use of the liquid oxygen system generates waste gas, which requires appropriate waste gas treatment measures to minimize environmental impact.
Above are the matters to be noted when using the liquid oxygen storage tank system, ensuring operational safety and the normal operation of the system. During operation, strict adherence to relevant operational procedures and safety requirements should be maintained to prevent accidents.

When selecting low-temperature liquefied natural gas (LNG) storage tanks, the following factors should be considered:
Tank Types: Common LNG tank types include vertical fixed-roof tanks, spherical tanks, and horizontal tanks. Choose the appropriate tank type based on specific application requirements and site conditions.
Tank Capacity: Determine the tank's capacity based on the storage requirements and projected usage of LNG. The tank capacity should be sufficient to meet the anticipated storage duration and supply needs.
Material Selection: LNG tanks typically use low-temperature steel or nickel alloy materials to ensure corrosion resistance and strength in low-temperature environments. Select the appropriate material based on the design pressure and temperature requirements of the tank.
Safety Performance: LNG tanks should possess excellent safety performance, including seismic resistance, fire resistance, and leak control capabilities. The tanks must comply with relevant safety standards and regulations, such as API 620, EN 1473, etc.
Maintenance and Inspection: Consider the maintenance and inspection requirements of the tank, including internal cleaning, coating protection, and corrosion prevention measures. The tank design should facilitate maintenance and inspection operations to ensure long-term reliable operation.
Environmental Impact: When selecting an LNG storage tank, consideration must be given to its impact on the surrounding environment. The layout and design of the tank should comply with environmental protection requirements, minimizing noise, vibration, and gas emissions to reduce environmental impact.
Cost-effectiveness: Consider the investment, operational, and lifecycle costs of the tank to select one with a favorable price-performance ratio.
需要注意的是，选型LNG储罐时应遵循相关的和地区的法规、标准和规范。此外，咨询的工程师或储罐制造商，以获取更详细和准确的选型建议。

Nitrogen purge in liquid nitrogen tanks refers to the process of injecting nitrogen gas into the tank to increase the nitrogen concentration and pressure inside, in order to meet certain safety requirements and operational objectives. Here are some precautions to consider when nitrogen purging liquid nitrogen tanks:
Safe Operation: Prior to conducting nitrogen flushing operations on liquid nitrogen tanks, it is mandatory that operators possess relevant safety knowledge and operational skills. Operators should wear appropriate personal protective equipment, such as protective goggles, gloves, and protective clothing.
Nitrogen Quality: Utilize high-purity nitrogen for purging operations to ensure the quality and purity of the nitrogen. Low-purity nitrogen may contain impurities or oxygen, which could have adverse effects on the liquid nitrogen within the storage tank.
Nitrogen Inerting Speed Control: During the nitrogen inerting process, the speed of nitrogen inerting should be controlled to avoid both too fast and too slow. Too rapid nitrogen inerting speed can lead to excessively high internal pressure in the tank, whereas too slow speed may result in extended inerting time.
Pressure Monitoring: During the nitrogen charging process, regular monitoring of the internal pressure changes in the storage tank is required. Ensure the internal pressure of the tank remains within the safe range and adjust as necessary.
Temperature Control: During the nitrogen purge process, attention should be given to controlling the temperature of the storage tank. The low temperature of liquid nitrogen can lead to condensation and dew on the tank and pipelines. Appropriate measures, such as heating or insulation, should be taken to prevent condensation and dew from occurring.
Post-nitrogen flushing treatment: After the nitrogen flushing operation is completed, the flushing unit should be promptly turned off, and the tank should be inspected and cleaned. Ensure that there is no residual nitrogen or impurities inside the tank.
Note: Nitrogen charging operations for liquid nitrogen tanks must be strictly adhered to the relevant safety standards.
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 for non-destructive testing, physical and chemical testing, welding testing, hydrostatic testing, etc. We have over 600 various instruments and 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 and technologies we have developed, such as welding for temperature and pressure vessels, biomass boiler emission reduction, and waste heat utilization, have successively been selected for multiple Shandong Provincial Department of Industry and Information Technology science and technology innovation projects, key projects in Shandong Province, 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 jointly developed deep cryogenic container processing technology, utilizing the international plasma arc + filler wire tungsten inert gas arc welding (PAW-GTAW) technology. After the provincial-level scientific and technological achievement appraisal, the technology level has reached an international standard in the field of deep cryogenic container manufacturing. Choose Zhongjie Special Equipment, and let's create brilliance together!