Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) was established in 2001, located at No. 2218 Jinnan Road, 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 area of 200,000 square meters, with the main workshop spanning 83,000 square meters. It currently employs 710 people, including 247 engineering and technical staff 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 Ministry of Industry and Information Technology. In June 2022, it was recognized as a "Gazelle Enterprise in Shandong Province" and in August 2022, it was identified 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 oxygen-filling equipment are in good working condition, check the tank's sealing and the proper functioning of the safety valve.
Connect equipment: Link the oxygenation equipment to the storage tank, ensuring the connection is sealed reliably.
Prepare liquid oxygen: Transfer liquid oxygen from the storage container to the storage tank of the oxygen-filling equipment. During the transfer, be mindful to avoid any leaks 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 prevent 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 actions taken.
Oxygen Filling Completed: Close the valve of the oxygen filling equipment and cease the oxygen filling operation once the tank reaches the required oxygen level or pressure.
Safety Handling: After oxygenation is completed, safety handling is required, including closing relevant valves and emptying 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 operation procedures and standards. Operators should receive training and strictly follow the operational procedures and safety measures to ensure the safety and reliability of the oxygen filling process.

Low-temperature storage tanks possess the following advantages:
Storage: Low-temperature storage tanks can maintain liquid low-temperature substances (such as liquid nitrogen, liquid oxygen, etc.) at low temperatures, preserving their liquid state. Compared to gas storage, liquid storage significantly increases storage density and saves space.
Long-term Storage: Low-temperature storage tanks are suitable for long-term storage of low-temperature 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 performance. The tank is made of special materials and designed with a structure that can withstand low temperatures and high pressures. Additionally, the tank is equipped with safety devices such as pressure relief valves and level alarms to ensure safe operation and use.
Widespread Applications Across Multiple Fields: Low-temperature storage tanks have extensive applications in various fields. They can be used for storing liquid oxygen, providing oxygen supply; in industrial sectors, they are suitable for storing liquefied natural gas (LNG) and other process gases like liquid nitrogen; in scientific research, they are used for storing low-temperature experimental samples.
Environmental Protection & Energy Efficiency: 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 materials, energy loss is minimal, thereby improving energy efficiency.
In summary, low-temperature storage tanks offer advantages such as storage, long-term storage, safety, multi-industry applications, and environmental protection and energy conservation. This makes them a crucial equipment for storing and supplying low-temperature materials, playing a significant role in various fields.

The operation and protection procedures for the use of low-temperature liquid nitrogen storage tanks should include the following:
Staff Training: All operators are required to undergo safe operation training for liquid nitrogen tanks, familiarize themselves with the properties, hazards, and proper operating procedures as well as emergency response measures.
Protective Gear: Operators must wear appropriate protective gear, including gloves, protective suits, and non-slip shoes, to safeguard themselves from the low temperatures of liquid nitrogen and other hazards.
Ventilation Requirements: Sufficient ventilation must be maintained in the operational area of the liquid nitrogen storage tank to expel gases produced by the evaporation of liquid nitrogen. Avoid excessive oxygen concentration to minimize the risk of fire and explosion.
Leak Control: Tanks must be equipped with leak detection and alarm systems to promptly identify and control the leakage of liquid nitrogen. Upon detection of a leak, immediate measures should be taken to control the source of the leak and carry out repairs.
Fire Prevention Measures: Nitrogen liquid has a low boiling and freezing point, which is prone to causing fires. To prevent and contain fires, measures such as installing firewalls around nitrogen liquid storage tanks and using fire-resistant coatings should be taken.
Static Protection: The accumulation of static electricity in liquid nitrogen tanks may cause sparks, increasing the risk of fire. Measures such as using static-conductive materials and anti-static equipment should be taken to reduce the accumulation and release of static electricity.
Regular inspections and maintenance: Conduct regular checks on the condition of liquid nitrogen tanks and associated 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: Liquid nitrogen tanks produce waste gas during operation, which requires appropriate waste gas treatment measures to prevent harm to the environment and human health.
Emergency Response Plan: Develop an emergency response plan for liquid nitrogen tanks, including procedures for handling leak incidents, emergency rescue measures, and the protocol for notifying relevant departments. Operators

The manufacturing process for the heads and cylinders of low-temperature storage tanks typically includes the following steps:
Material Preparation: Select suitable materials, such as low-temperature alloy steel or stainless steel, based on design requirements and specifications. Inspect and receive the materials to ensure they meet quality standards.
Sheet Material Cutting: Sheets are cut according to design dimensions and shapes. Common cutting methods include flame cutting, plasma cutting, or laser cutting, among others.
Bending and forming: Cut sheets are bent and formed to create shapes for heads and cylinders. Common forming methods include cold bending, hot bending, or hydraulic forming, etc.
Welding: The shaped plates are welded together to form the structure of the head and cylinder. Common welding methods include manual arc welding, gas shielded welding, or laser welding, etc.
Weld Seam Treatment: Process the weld seams after welding, such as sanding, polishing, or applying anti-corrosion coatings, to enhance the quality and appearance of the welds.
Inspection and Acceptance: Inspect and accept the finished head and cylinder to ensure their quality and compliance with design specifications. Common inspection methods include ultrasonic testing, radiographic inspection, or liquid penetrant testing, etc.
Reinforcement and Support: As required, processing and installation of reinforcement and support on the heads and cylinders to enhance the structural strength and stability.
Surface Treatment: The heads and cylinders are subjected to surface treatment, such as coating with anti-corrosion paint, hot-dip galvanizing, or polishing, to enhance their corrosion resistance and aesthetic quality.
It is important to note that the manufacturing process of low-temperature storage tanks must comply with relevant standards and regulations to ensure the quality and safety of the production process. During the manufacturing process, strict adherence to relevant safety operation procedures and the implementation of necessary protective measures are required to ensure the safety of the operators.
Shandong Zhongjie Special Equipment, welcome customers to visit our factory for business discussions.