Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) holds an A-grade boiler manufacturing license, an A2-grade pressure vessel manufacturing license, an A2-grade pressure vessel design license, a B-grade boiler installation license, and GB2/Class, GC2/Class pressure pipeline installation licenses, as well as a mechanical and electrical equipment installation contracting qualification. It is a member of the China Boilers and Water Treatment Association, the China Chemical Equipment Association, and the council unit of the Shandong Equipment Manufacturing Association. The company has also passed the ISO9001 Quality Management System, ISO14001 Environmental Management System, OHSAS18001 Occupational Health and Safety Management System certifications, and the American ASME/U2 certification.
Daily inspections of liquid nitrogen tanks should include the following aspects:
Level Inspection: Regularly check the liquid nitrogen tank's level to ensure it remains within the normal range. Inspections can be conducted using level gauges or level scales, etc.
Pressure Check: Inspect the tank's pressure to ensure it is within the safe range. Pressure gauges or pressure sensors can be used for the inspection.
Insulation Layer Inspection: Check for any damage or detachment in the storage tank's insulation layer. The integrity of the insulation layer is crucial for reducing heat transfer and the evaporation of liquid nitrogen.
Leakage Inspection: Check for signs of liquid nitrogen leakage around the tank, such as vapor mist, frost, or freezing. If a leak is detected, take immediate action to repair it.
Valve and Pipe Inspection: Verify that the valves and pipes of the storage tank are functioning properly without any gas leakage or blockages. Ensure the tightness and unobstructed flow of the valves and pipes.
Safety Device Inspection: Examine the safety devices of the storage tank, such as pressure relief valves, temperature sensors, and level alarms, to ensure they are functioning properly.
Tank External Cleaning: Regularly clean the external surface of the tank to remove dust, dirt, and debris. Maintain the tank's appearance for easy inspection and maintenance.
Tank Records and Documentation: Timely record the inspection results and maintenance records of the tank, including liquid levels, pressure, insulation condition, and leakage situations. These records aid in monitoring the tank's operational status and identifying issues promptly.
The above details the routine inspection points for liquid nitrogen storage tanks. Regularly conducting these checks ensures the safe and efficient operation of the tanks. Additionally, it's crucial to adhere to relevant safety regulations and operational guidelines to ensure the safety of personnel and equipment.

The filling process for liquid nitrogen tanks typically includes the following steps:
Preparation: Ensure the tank and filling equipment are in good condition, free from damage or leaks. Check that the tank's insulation layer is intact and undamaged.
Safety Inspection: Check the tank and its surrounding environment for safety. Ensure there are no flammable materials or other hazardous items in the vicinity of the tank.
Connect equipment: Link the filling equipment to the storage tank. Ensure the connection is securely fastened and leak-free.
Prepare Liquid Nitrogen: Prepare liquid nitrogen supply, ensuring the quality and purity meet the requirements.
Turn on valves: Follow the operation instructions for the filling equipment, gradually open the corresponding valves to allow liquid nitrogen to flow from the supply source into the storage tank.
Regulate Flow: Adjust the flow control valve of the filling equipment as needed to control the inflow speed of liquid nitrogen. Ensure a moderate flow rate, avoiding too fast or too slow.
Monitor Liquid Level: Real-time monitoring of the liquid nitrogen level in the storage tank via a level gauge or other level monitoring devices. Ensure the level is maintained within a safe range.
Cease Filling: Close the valve of the filling equipment when liquid nitrogen is filled to the tank or reaches the desired level, halting the inflow of liquid nitrogen.
Disconnect: Disconnect the filling equipment from the storage tank and ensure there are no leaks at the connection point.
Safety Inspection: Conduct a secondary check of the tank and its surrounding environment to ensure there are no leaks or other safety hazards.
Please note that the process described is for general reference only; the actual filling process may vary depending on the specific type of tank and filling equipment. When performing the filling operation for liquid nitrogen tanks, please adhere to the relevant operational specifications and safety requirements, and ensure that the operators have received the necessary safety training and skills.

The low-temperature storage tank boasts several advantages:
Storage: Low-temperature storage tanks can store liquefied low-temperature substances (such as liquid nitrogen, liquid oxygen, etc.) at low temperatures, maintaining their liquid state. Compared to gas storage, liquid storage significantly increases storage density and saves space.
Long-term Storage: Low-temperature storage tanks are designed for long-term storage of cold materials, extending their service life. By controlling the temperature inside the tank and the performance of the insulation layer, the evaporation and oxidation of the liquid material can be slowed down, maintaining its stability and purity.
Safety: The low-temperature storage tank boasts excellent safety features. Constructed with special materials and design, it can withstand low temperatures and high-pressure environments. Additionally, the tank is equipped with safety devices such as pressure relief valves and level alarms to ensure safe operation and usage.
Wide Range of Applications: Low-temperature storage tanks have extensive applications across multiple fields. They can be used for storing liquid oxygen and providing oxygen supply; in industrial sectors, they are suitable for storing liquefied natural gas (LNG) and other process gases like liquid nitrogen; and in scientific research, they can store低温 experimental samples.
Eco-friendly Energy-saving: Low-temperature storage tanks enable effective storage and utilization of low-temperature substances, reducing energy waste and environmental pollution. During the storage and transportation of liquid substances, energy loss is minimal, enhancing energy utilization efficiency.
In summary, low-temperature storage tanks offer advantages such as storage, long-term storage, safety, multi-field applications, and environmental protection and energy saving. This makes them a crucial equipment for storing and supplying low-temperature materials, playing a significant role in various industries.

The use and operation of the liquid oxygen storage tank system should be mindful of the following points:
Safe Operation: When operating the liquid oxygen storage tank system, it is mandatory to adhere to the relevant safety operation 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 around the tank is required, and it should be kept away from flammable materials and heat sources.
Seal Integrity Inspection: Regularly inspect the tank system's sealing performance to ensure there are no leakage issues at valve and pipeline connections.
Pressure Control: The tank system should be equipped with a pressure gauge and a safety valve, with regular inspections and maintenance to ensure pressure remains within safe limits.
Fire Prevention Measures: Liquid oxygen contains a high oxygen content, which is highly flammable. Establish fire walls around the storage tank system, ban smoking and open flames, and ensure safety.
Electrostatic Protection: During the operation of the liquid oxygen system, static electricity may cause sparks, increasing the risk of fire. Measures such as using electrostatic 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, pipes, pressure gauges, etc. Ensure the equipment is in perfect condition and promptly repair or replace any damaged parts.
Waste Gas Treatment: During the operation of the liquid oxygen system, waste gas is produced, and appropriate waste gas treatment measures must be taken to minimize environmental impact.
Above are the precautions to be taken 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 avoid accidents.
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