Shandong Zhongjie Special Equipment's main products include: fuel (gas) boilers, organic heat carrier boilers, biomass boilers, waste heat recovery boilers, and other boiler products; vacuum insulation cryogenic pressure vessels such as LNG tanks, oxygen/nitrogen/argon tanks, and CO2 tanks; pressure vessel products such as denitrification engineering equipment, heat storage and energy storage equipment, and complete chemical equipment; central air conditioning and HVAC equipment such as ground (water) source heat pumps, air source units, water-cooled screw units, and air-cooled modular units. Planned products include large-scale energy centers, LNG transport vehicles, LNG tank containers, and other green energy equipment.
Nitrogen charging of liquid nitrogen storage tanks refers to the process of injecting nitrogen gas into the storage 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 charging liquid nitrogen storage tanks:
Safe Operation: Prior to conducting nitrogen purge operations on liquid nitrogen tanks, it is mandatory that operators possess relevant safety knowledge and skills. Operators should wear appropriate personal protective equipment, such as safety goggles, gloves, and protective clothing.
Nitrogen Quality: Utilize high-purity nitrogen for inerting operations to ensure the quality and purity of the nitrogen. Low purity nitrogen may contain impurities or oxygen, which could adversely affect 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 being too fast or too slow. Too fast a speed can lead to excessive internal pressure within the tank, while too slow a speed can result in extended inerting time.
Pressure Monitoring: During the nitrogen purge process, the internal pressure of the tank should be regularly monitored. Ensure that the internal pressure of the tank remains within the safe range and adjust as necessary.
Temperature Control: During the nitrogen charging 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 storage 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 shut off, and the tank should be inspected and cleaned. Ensure that there is no residual nitrogen or impurities inside the tank.
Note: The nitrogen charging operation for liquid nitrogen tanks must strictly adhere to relevant safety standards.

During the operation of low-temperature storage tanks, it is indeed necessary to avoid the occurrence of wrinkling. Wrinkling refers to the phenomenon where the tank walls develop creases or deformations, which may lead to a decrease in the structural integrity of the tank and could even cause leaks or ruptures.
Below are some precautions to avoid tank squeezing in low-temperature storage:
Tank Design: Select an appropriate tank design to ensure it can withstand the pressure and weight of low-temperature liquids. The tank's wall thickness, support structure, etc., should comply with relevant standards and regulations.
Material Selection: Choose materials suitable for low-temperature environments, with sufficient strength and low-temperature resistance. Common materials include low-temperature steel, stainless steel, etc.
Insulation Layer for Storage Tanks: The design and construction of the insulation layer must meet requirements to ensure effective reduction of heat conduction and temperature variation. The material and thickness of the insulation layer should be selected based on specific conditions.
Tank Operation: During the loading and unloading of liquids in the tank, it is essential to avoid rapid or excessive fluid flow to minimize impact and stress concentration on the tank walls.
Tank Maintenance: Regularly inspect and maintain the structure and insulation of the tank to ensure its integrity. Any abnormalities or damages should be repaired or replaced promptly.
Temperature Control: During the operation of low-temperature liquid storage tanks, it is crucial to strictly control the temperature difference between the inside and outside of the tank to avoid excessive temperature changes and thermal stress.
In summary, preventing extrusion in low-temperature storage tanks relies on proper design, material selection, the application of insulation layers, and maintenance, along with strictly controlling temperature variations. Regular inspections and maintenance are crucial for ensuring the safe operation of the storage tanks.

Low-temperature industrial gas filling stations are equipment used to fill liquid low-temperature industrial gases (such as liquid oxygen, liquid nitrogen, liquid argon, etc.) into gas storage tanks. Here is some basic information about low-temperature industrial gas filling stations:
Tank Type: Low-temperature industrial gas tanks commonly use double-walled vacuum insulated tanks, where the inner wall is used for storing liquid gas and the outer wall for insulation and heat preservation to minimize heat transfer and evaporation loss of the liquid gas.
Filling Equipment: Low-temperature industrial gas storage tank filling stations include liquid-gas filling pumps, filling pipelines, flowmeters, pressure sensors, and other equipment. The liquid-gas filling pump is used to extract liquid gas from storage tanks or gas cylinders and fill it into the target storage tank.
Filling Process: The operational procedure at the filling station generally includes the following steps: Preparations (checking equipment, preparing filling medium), Equipment Connection (connecting filling pumps, pipes, etc.), Equipment Activation (starting the filling pump, adjusting flow and pressure), Filling Operation (filling liquid gas into the target storage tank), Monitoring and Control (monitoring parameters such as pressure and flow during the filling process to ensure safety and quality), and Completion of Operation (shutting down equipment, cleaning the work area).
Safety Measures: Strict adherence to relevant safety operating procedures and standards is required during the operation of low-temperature industrial gas filling stations. Operators should receive training to understand the properties and safety considerations of liquid gases. Additionally, filling stations should be equipped with safety devices such as pressure sensors and safety valves to ensure safety during the filling process.
Quality Control: Quality control is required during the filling process at the filling station, including monitoring parameters such as flow rate, pressure, and temperature of the filling medium, to ensure the accuracy and quality of the filling.
It's important to note that the operation of low-temperature industrial gas storage tank filling stations must be conducted by trained personnel and strictly adhere to relevant operational procedures and safety measures. Additionally, the design and manufacture of filling stations must comply with applicable standards and regulations to ensure equipment safety and reliability.

Liquid Oxygen Storage Tanks are specialized equipment that require special attention to safety and an understanding of their characteristics. Below are the safety precautions and features of using liquid oxygen storage tanks: **Safety Precautions:** - **Operation:** The operation of liquid oxygen storage tanks should be conducted by personnel who are trained and experienced. Operators should be familiar with the tank's structure, performance, and operating procedures, and operate strictly according to the manual and safety regulations. - **Fire Prevention Measures:** Liquid oxygen is highly oxidizing and can easily cause fires and explosions. Open flames and sparks, as well as high-temperature objects, should be prohibited around the storage tank. Fire prevention equipment and fire extinguishing materials should be established and regularly inspected and maintained. - **Leakage Control:** In case of leakage, immediate measures should be taken to control the leakage. Leaks can lead to the evaporation of liquid oxygen and an increase in oxygen concentration, raising the risk of fire and explosion. A leak detection system should be established, and leak control devices and personal protective equipment should be provided. - **Insulation Protection:** Liquid oxygen storage tanks should have good insulation protection to reduce evaporation and maintain a low temperature. The insulation layer should be regularly inspected and maintained to ensure its integrity and insulating performance. - **Safety Distance:** A certain safety distance should be maintained around the storage tank to prevent the spread of fires, explosions, and leaks. The specific safety distance requirements should be assessed and determined based on local regulations and standards. **Features:** - **High Oxidizing Properties:** Liquid oxygen is highly oxidizing, capable of supporting combustion and causing it to burn more intensely. Therefore, special attention must be given to fire and explosion prevention measures when using liquid oxygen storage tanks. - **High Pressure Storage:** Liquid oxygen storage tanks typically store high-pressure oxygen, with pressures usually around 2-5 bar. Therefore, during the operation and maintenance of liquid oxygen storage tanks, attention must be paid to pressure control and the safety of pressure relief devices. - **Low-Temperature Storage:** The liquid oxygen in the storage tank is at a low temperature, usually around -183°C. Therefore, when contacting the liquid oxygen storage tank, appropriate protective measures should be taken.
Our company attaches great importance to technological innovation and R&D design. We possess 1 municipal-level enterprise technology center in Heze City, with testing facilities for non-destructive testing, physical and chemical testing, welding testing, hydrostatic testing, etc. We are equipped with 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 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, key projects in Shandong Province, and Heze City innovation and excellence projects. We have accumulated 27 authorized utility model patents, 16 authorized invention patents, participated in drafting 2 standards, 2 industry standards, and registered 15 trademarks. The technical team of our company, in collaboration with Professor Li Yajiang of Shandong University, has jointly developed deep cryogenic container processing technology, which adopts the international plasma arc + wire filling argon arc welding (PAW-GTAW) technology. After being appraised as a provincial-level scientific and technological achievement, the technology level has reached international standards in the field of deep cryogenic container manufacturing. Choose Zhongjie Special Equipment, and let's create brilliance together!