Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) was established in 2001, located at No. 2218 Jinan Road, Economic Development Zone, Heze City. With a registered capital of 50 million yuan and total assets of 500 million yuan, the company operates 7 business centers: boilers, deep-freeze vessels, pressure vessels, central air conditioning, engineering installation, international trade, and Internet of Things. It has three factory sites on Jinan 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. Currently, there are 710 employees, including 247 engineering and technical staff and 82 middle-level technical personnel. 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 of Shandong Province" by the Ministry of Industry and Information Technology. In June 2022, it was named a "Gazelle Enterprise of Shandong Province," and in August 2022, it was recognized as a "Specialized and New Small Giant Enterprise" by the Ministry of Industry and Information Technology.
The oxygen filling process for liquid oxygen tanks must adhere to specific operational procedures and safety measures. Here are the steps for filling liquid oxygen tanks:
Preparation: Ensure the tank and oxygenation equipment are in good working condition, check the tank's seal integrity and the normal operation of the safety valve.
Connect equipment: Link the oxygenation equipment to the tank, ensuring a reliable and sealed connection.
Prepare liquid oxygen: Transfer liquid oxygen from the storage container to the storage tank of the oxygen-filling equipment. During the transfer, be cautious to prevent any leakage or contact with the liquid oxygen.
Oxygen Filling Operation: Open the valve of the oxygen filling equipment and fill liquid oxygen from the storage tank into the storage tank. During the filling process, control the filling speed and pressure to avoid excessive pressure and temperature rise in the storage tank.
Monitoring and Control: During the aeration process, it is necessary to monitor the tank's pressure and temperature to ensure they remain within safe limits. In case of any anomalies, the aeration should be stopped immediately and appropriate measures should be taken.
Oxygen Filling Completed: Once the tank reaches the required oxygen filling level or pressure, close the valve of the oxygen filling equipment and stop the oxygen filling operation.
Safety Processing: After the oxygenation is completed, safety processing is required, including closing the relevant valves and draining any remaining liquid oxygen from the oxygenation equipment.
Note that liquid oxygen is highly oxidizing and flammable; the oxygen filling process must strictly adhere to relevant safety operating procedures and standards. Operators should receive training and strictly follow operational procedures and safety measures to ensure the safety and reliability of the filling process.

To extend the service life of low-temperature liquid storage tanks, the following measures can be taken:
Regular inspections and maintenance: Conduct periodic visual inspections of the tank, including the shell, welds, valves, and fittings. Check for any abnormalities such as cracks, corrosion, or deformation, and promptly repair or replace damaged parts.
Maintain Insulation: Insulation is crucial for the thermal preservation of low-temperature liquid storage tanks. Regularly inspect the integrity and insulating performance of the insulation, repair or replace damaged insulation materials to ensure the tank's insulating effectiveness.
Control temperature and pressure: The temperature and pressure of the low-temperature liquid storage tank should be maintained within a safe range. Avoid excessive or low temperatures and pressures that may damage the tank. Implement appropriate cooling or heating measures to ensure stable temperature and pressure of the liquid.
Corrosion Protection: The exterior shell and internal structure of the tank should be protected against corrosion and oxidation. Regular inspections and maintenance of the protective coating are essential to ensure its integrity.
Avoid excessive pressure and overfilling: Prevent the internal pressure of the tank from being too high or too low, as well as overfilling with liquid. Excessive pressure and overfilling can lead to structural破裂 or damage to the tank.
Regular cleaning and waste removal: Clean the interior of the tank regularly to remove accumulated impurities and dirt. Regularly remove waste to prevent damage to the tank from杂质 and sediments in the liquid.
Safety Operations and Training: Ensure operators are knowledgeable and skilled in the safe handling of cryogenic liquid storage tanks. Enhance safety training to boost operators' awareness and emergency response capabilities.
Manage records and documents: Establish comprehensive management records and documents, including the usage status of storage tanks.

Proper management regulations for the use of low-temperature liquid storage tanks encompass the following aspects:
Tank Selection and Installation: Choose a suitable low-temperature liquid storage tank and ensure it complies with relevant standards and regulations. Installation of the tank should be carried out by personnel, following the manufacturer's instructions and requirements to ensure stability and safety.
Safety Operating Procedures: Establish and implement safety operating procedures for liquid storage tanks, including startup, shutdown, filling, and venting procedures. Operators must receive training to understand the characteristics of liquid storage tanks, safety precautions, and emergency response measures.
Safety Equipment and Protective Measures: Tanks should be equipped with necessary safety devices, such as pressure sensors, safety valves, and leak detectors, to monitor and control the pressure and temperature of the tank. Additionally, operators should wear appropriate personal protective equipment, like insulating gloves and protective suits, to ensure their own safety.
Regular Inspections and Maintenance: Conduct regular inspections and maintenance on low-temperature liquid storage tanks, including checking the tank's appearance, sealing, and corrosion prevention measures. In case of any issues, promptly repair or replace the tank to ensure its proper operation and safety.
Waste Management: Abandoned low-temperature liquid storage tanks should be disposed of in accordance with relevant environmental protection regulations. The residual liquids in the abandoned tanks should be handled properly to prevent environmental pollution.
Tank Record and Tracking: Establish tank usage records, including filling dates, filling quantities, usage status, etc. Additionally, it is recommended to set up a tank tracking system for monitoring and managing tank usage and maintenance.
Above are some common management regulations for low-temperature liquid storage tanks, with specific regulations potentially varying by industry and region. When using low-temperature liquid storage tanks, relevant laws and standards should be adhered to, and appropriate management measures should be established based on actual conditions.

Prior to filling the liquid nitrogen tank, the following checks must be conducted:
Tank exterior inspection: Check for any visible damage, deformation, or corrosion on the tank's exterior, including the tank wall, valves, pipes, and joints.
Sealability Inspection: Check the tank's sealing performance, including inspecting for any leakage at valves and pipe connections, to ensure the tank maintains good sealing integrity.
Pressure Check: Verify that the tank's pressure gauge is functioning properly and that the pressure is within the normal range to ensure the tank operates normally.
Level Check: Verify the liquid level in the tank to ensure it is within the normal range, preventing issues caused by either excessive or insufficient levels.
Insulation Layer Inspection: Check for any damage or detachment in the storage tank's insulation layer to ensure effective insulation and reduce evaporation losses of liquid nitrogen.
Leakage Inspection: Check for signs of liquid nitrogen leakage around the storage tank, including any frost, ice, or liquid nitrogen stains on the ground.
Safety Equipment Inspection: Verify that the safety equipment of the storage tank, such as leak detectors, alarm systems, and safety valves, are functioning properly to ensure the tank's safety.
Clean Inspection: Ensure the interior of the tank is clean, removing accumulated impurities and dirt to maintain the tank's cleanliness and hygiene.
The above outlines the checks required prior to filling a liquid nitrogen tank, ensuring safe operation of the tank and proper storage of liquid nitrogen. During the inspection, strictly adhere to the relevant operational procedures and safety requirements to ensure operational safety.
ZJ Special Equipment upholds the great vision of "realizing employees' dreams, creating customer value, and striving for the prosperity and strength of our motherland," and is dedicated to the development of green energy equipment. We offer products and services with high cost-performance to contribute to society!