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-freezing 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 of 200,000 square meters. The main workshop spans 83,000 square meters. It currently employs 710 people, including 247 engineers and technicians and 82 intermediate-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 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.
Oxygen cylinders and liquid oxygen tanks are equipment used for storing oxygen, but they have some distinctions: 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 generally around 200-300 bar. Liquid oxygen tanks store liquid oxygen at lower pressures, typically 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, suitable for industrial or large-scale use. Storage method: Oxygen cylinders store oxygen in a gaseous form, via compressed gas storage. Liquid oxygen tanks store oxygen as a liquid, by cooling it to below its boiling point to convert it into a liquid. Safety requirements: Due to the high oxidizing nature of liquid oxygen, liquid oxygen tanks require stricter safety standards in design and use. Liquid oxygen tanks usually need to have good thermal insulation, leak control, and fire prevention measures to ensure safe operation. It is important to note that the specific design and specifications of oxygen cylinders and liquid oxygen tanks may vary depending on different regions, applications, and locations. When using these tanks, it is essential to follow applicable regulations, standards, and safety guidelines, and to collaborate with local regulatory bodies and personnel to ensure the tanks' safety and reliability.

The reasons why low-temperature liquid storage tanks have been at the peak in recent years are as follows:
Rising Demand: With the development of industries such as manufacturing and scientific research, there is a growing demand for low-temperature liquids. Low-temperature liquid storage tanks can effectively store and supply liquid oxygen, liquid nitrogen, liquid gases, and other low-temperature liquids, meeting the needs of various fields.
Technological Advancements: In recent years, the manufacturing and material technologies for low-temperature liquid storage tanks have continuously improved and innovated. The application of new insulating materials, advanced refrigeration systems, and safety control devices has enhanced the performance and safety of the tanks, making them more reliable and secure.
Environmental Awareness Enhancement: Low-temperature liquid storage tanks can effectively store and utilize low-temperature liquids, reducing energy waste and environmental pollution. In the context of enhanced environmental awareness, low-temperature liquid storage tanks, as an environmentally friendly and energy-saving device, have gained more attention and application.
Emerging Application Fields: There is an increasing demand for low-temperature liquid storage tanks in emerging application fields. For instance, the application of liquid nitrogen in frozen food, biopharmaceuticals, and semiconductor manufacturing is becoming more widespread, driving the development of low-temperature liquid storage tanks.
Policy Support: The government has provided support and encouragement for the development of low-temperature liquid storage tanks. Through policy guidance and financial support, the industry has been promoted and expanded.
In summary, the peak of low-temperature liquid storage tanks in recent years is mainly due to increasing demand, technological advancements, heightened environmental awareness, the development of emerging application fields, and policy support. These factors collectively drive the rapid development of the low-temperature liquid storage tank industry.

In the welding process of low-temperature liquid storage tanks, controlling the occurrence of welding cracks is crucial. The following are some methods and measures for controlling welding cracks:
Appropriate Welding Processes: Selecting the appropriate welding process and parameters can reduce welding heat input and thermal stress. Low heat input welding methods, such as pulsed welding and laser welding, can lower the temperature gradient and residual stress in the welding heat-affected zone.
Preheating and Post Heat Treatment: Perform appropriate preheating before welding to enhance material toughness and reduce thermal stress. After welding, conduct a suitable post heat treatment, such as annealing or stress-relieving heat treatment, to minimize residual stress and improve the toughness of the weld.
Select appropriate welding materials: Choose welding materials with good toughness and crack resistance to minimize the occurrence of welding cracks. Select the appropriate welding material based on the storage tank's operating conditions and requirements, such as low-alloy steel, stainless steel, etc.
Control Welding Process: Monitor and adjust parameters and operations during the welding process to minimize the risk of welding cracks. Pay attention to factors such as welding speed, current, voltage, and welding sequence to avoid overheating or rapid welding, thereby reducing the accumulation of thermal and residual stresses.
Non-destructive Inspection and Evaluation: After welding, conduct non-destructive tests on the welds, such as ultrasonic testing and X-ray testing, to assess the quality of the weld and the presence of cracks. Promptly identify and repair welding cracks to ensure the integrity and safety of the weld joints.
It's important to note that controlling welding cracks is a complex process that requires considering various factors, such as materials, welding techniques, and operations. When welding low-temperature liquid storage tanks, it's advisable to consult with a welding engineer or a relevant institution for guidance to ensure both welding quality and tank safety.

When storing liquid nitrogen in low-temperature storage tanks, the following points should be noted:
Protective Gear: When handling low-temperature storage tanks, appropriate protective gear is mandatory, including protective gloves, suits, and non-slip shoes. This equipment safeguards the skin from the low temperatures of liquid nitrogen and other hazards.
Avoid direct contact: Liquid nitrogen is extremely cold and can cause frostbite. Therefore, it is crucial to avoid direct contact with liquid nitrogen, especially with the skin. Use tools or equipment for handling, and never touch liquid nitrogen with your hands.
Ventilation Requirements: In the operating area of low-temperature storage tanks, adequate ventilation must be ensured to expel gases produced by the evaporation of liquid nitrogen. Maintain air circulation to avoid excessive oxygen concentration and reduce the risk of fire and explosion.
Prevent Leaks: Regularly inspect the low-temperature storage tanks for leaks and equip them with leak detectors and alarm systems. In case of a leak, take immediate action to control and repair it. Avoid hazards to personnel and the environment caused by the leakage of liquid nitrogen.
Fire Prevention Measures: Liquid nitrogen has a low boiling and freezing point, which makes it prone to fires. To prevent and contain fires, fire barriers and fire-retardant coatings are installed around low-temperature storage tanks.
Static protection: Electrostatic buildup in low-temperature storage tanks can 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 low-temperature storage tanks and related equipment, including valves, pipes, pressure gauges, etc. Ensure that the equipment is in perfect condition, and promptly repair or replace any damaged parts.
Waste Gas Treatment: During the operation of low-temperature storage tanks, waste gas is produced, which requires appropriate waste gas treatment measures to minimize environmental impact.
Above are the precautions to be taken when storing liquid nitrogen in a low-temperature storage tank, to ensure operational safety and the normal operation of the tank. During operation, strictly adhere to the relevant operational procedures and safety operation requirements to prevent accidents.
Shandong Zhongjie Special Equipment, welcome clients for factory negotiations and cooperation.