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 Boiler and Water Treatment Association, the China Chemical Equipment Association, and the council member 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.
Oxygen cylinders and liquid oxygen tanks are equipment used for storing oxygen, but they have some differences: - Storage Form: Oxygen cylinders are typically used for storing gaseous oxygen, while liquid oxygen tanks are for storing liquid oxygen. Oxygen is in a gaseous state at room temperature but is cooled to a liquid state at low temperatures for more efficient storage and use. - Storage Pressure: Oxygen cylinders usually store high-pressure oxygen, with pressures around 200-300 bar. Liquid oxygen tanks, however, store liquid oxygen at lower pressures, generally around 2-5 bar. - Storage Capacity: Oxygen cylinders generally have smaller capacities, suitable for personal or small-scale use. Liquid oxygen tanks have larger capacities, ideal for industrial or large-scale applications. - Storage Method: Oxygen cylinders store oxygen in a gaseous form, via compressed gas storage. Liquid oxygen tanks store oxygen in a liquid form, converting it to a liquid state by cooling it below its boiling point. - Safety Requirements: Due to the high oxidizing nature of liquid oxygen, liquid oxygen tanks require stricter safety requirements in design and use. They typically need to have good insulation protection, leak control, and fire prevention measures to ensure safe operation. - Note: The specific design and specifications of oxygen cylinders and liquid oxygen tanks may vary depending on different regions and application sites. When using these tanks, it is important to follow applicable regulations, standards, and safety guidelines, and to cooperate with local regulatory authorities to ensure the safety and reliability of the tanks.

Prior to filling the liquid nitrogen tank, the following checks must be conducted:
Tank exterior inspection: Check for any obvious damage, deformation, corrosion, etc., on the tank's exterior, including the tank wall, valves, pipes, and joints.
Sealability Inspection: Verify the tank's sealing performance, including checking 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 correctly and that the pressure is within the normal range to ensure the tank operates properly.
Level Check: Verify the liquid level in the tank to ensure it is within the normal range, avoiding issues caused by either excessively high or low levels.
Insulation Layer Inspection: Check for any damage or detachment in the storage tank's insulation layer to ensure proper 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 storage tank's safety equipment, 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 any 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 process, strict adherence to relevant operational procedures and safety standards must be maintained to ensure operational safety.

Maintaining and being aware of the precautions for liquid nitrogen tanks is crucial. Here are some key points:
Maintenance:
Regular Inspections: Conduct regular inspections of the liquid nitrogen tank's exterior, valves, pipes, and other components to ensure they are intact and undamaged. Pay special attention to check for any leaks, corrosion, or other forms of damage.
Clean Storage Tanks: Regularly clean liquid nitrogen storage tanks to remove internal dirt and sediment. Use appropriate cleaning agents and tools, and follow the cleaning procedures and safety operating protocols.
Liquid Nitrogen Refill: Refill liquid nitrogen as needed on a regular basis. Ensure the storage tank maintains an adequate supply of liquid nitrogen to meet usage requirements.
Maintain Pressure: Regularly check the liquid nitrogen tank's pressure to ensure it remains within the safe range. Conduct pressure tests and adjustments as necessary.
Corrosion Treatment: Based on the material of the tank and its operating environment, appropriate corrosion prevention measures are taken to extend the service life of the tank. For instance, applying anti-corrosion coatings and conducting regular corrosion treatments.
Cautionary Notes:
Safe Operation: Strict adherence to safety protocols and standards is mandatory when using liquid nitrogen tanks. Operators must be trained, knowledgeable about the properties of liquid nitrogen and safety operation requirements, and familiar with the tank equipment and operational procedures.
Protection Measures: When using liquid nitrogen tanks, it is mandatory to take necessary protective measures, such as wearing protective gloves and suits. Avoid direct contact with liquid nitrogen to prevent frostbite.
Leak Control: Conduct regular inspections of liquid nitrogen storage tanks for leaks and equip them with leak detectors and alarm systems. In case of a leak, take immediate measures to control it and proceed with repairs.
Ventilation Requirements: In enclosed spaces where liquid nitrogen tanks are used, adequate ventilation must be ensured.

Liquid nitrogen tanks are widely used in meat freezing. The following are several main applications of liquid nitrogen tanks in meat freezing:
Quick Freezing: Liquid nitrogen tanks can provide low temperatures to rapidly freeze meats to the required temperature. Due to the low-temperature properties of liquid nitrogen, the temperature of the meat can be quickly reduced in a short period, effectively preserving the quality and texture of the meat.
Chilled Storage: Liquid nitrogen tanks are suitable for long-term freezing storage of meat products. Placing meat in a liquid nitrogen tank helps maintain low temperatures, preventing the growth of bacteria and microorganisms, thereby extending the shelf life of the meat.
Refrigerated Transport: Liquid nitrogen tanks are suitable for the freezing transportation of meat products. Placing the meat in a liquid nitrogen tank maintains its low temperature, ensuring the quality and freshness of the meat throughout the transportation process.
Chilling Process: Liquid nitrogen tanks are suitable for meat chilling. By exposing meat to liquid nitrogen, the surface can be rapidly frozen, creating a chilling layer, thereby preserving the meat's moisture and nutritional content.
Chilled Processing: Liquid nitrogen tanks can be used for meat freezing processing. Placing meat in liquid nitrogen makes it harder and crispier, facilitating cutting, slicing, and processing.
Be mindful that when using liquid nitrogen tanks for meat freezing, it's crucial to adhere to the relevant safety operating procedures and guidelines. Ensure that operators are equipped with the necessary safety awareness and operational skills to prevent accidental incidents. Additionally, consult with food safety experts.
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