Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) was established in 2001, located at No. 2218 Jinnan Road, Economic and Technological Development Zone, Heze City. With a registered capital of 50 million yuan and total assets of 500 million yuan, the company has seven business centers: boiler, 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 engineers and technicians, 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, Fine, and New Enterprise in Shandong" by the Ministry of Industry and Information Technology. In June 2022, it was named a "Gazelle Enterprise in Shandong" and in August 2022, it was recognized as a "Specialized, Fine, and New Small Giant Enterprise" by the Ministry of Industry and Information Technology.
Several reasons have contributed to the peak popularity of low-temperature liquid storage tanks in recent years:
Rising Demand: With the development of industries such as manufacturing and scientific research, the demand for low-temperature liquids is continuously increasing. 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, there have been continuous improvements and innovations in the manufacturing technology and materials for low-temperature liquid storage tanks. 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 enable effective storage and utilization of low-temperature liquids, reducing energy waste and environmental pollution. Against the backdrop of enhanced environmental awareness, low-temperature liquid storage tanks, as an environmentally friendly and energy-saving equipment, have gained more attention and application.
Emerging Application Fields: There is an increasing demand for cryogenic 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 cryogenic 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 status of low-temperature liquid storage tanks in recent years is primarily due to increasing demand, technological advancements, heightened environmental awareness, the development of new application areas, and policy support. These factors collectively drive the rapid growth 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 Techniques: Selecting the right welding process and parameters helps reduce welding heat input and thermal stress. Methods with low heat input, such as pulse welding and laser welding, can lower the temperature gradient and residual stress in the heat-affected zone.
Preheating and post-heat treatment: Perform appropriate preheating before welding to enhance material toughness and reduce thermal stress. Conduct suitable post-heat treatment, such as annealing or stress-relief heat treatment, after welding to minimize residual stress and improve weld toughness.
Select appropriate welding materials: Choose welding materials with good toughness and crack resistance to minimize the occurrence of welding cracks. Select suitable welding materials based on the storage tank's operating conditions and requirements, such as low-alloy steel, stainless steel, etc.
Control Welding Process: Monitor and regulate 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 is completed, conduct non-destructive testing on the welds, such as ultrasonic testing, X-ray testing, etc., to assess welding quality 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, requiring a comprehensive consideration of factors such as material, welding techniques, and operations. When welding low-temperature liquid storage tanks, it's advisable to consult with a welding engineer or relevant institutions 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 operating low-temperature storage tanks, it is mandatory to wear appropriate protective gear, including gloves, protective clothing, and non-slip shoes. This gear 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 essential to avoid direct contact with liquid nitrogen, especially with the skin. Use tools or equipment for handling, and prevent direct hand contact with liquid nitrogen.
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 detection and alarm systems. In case of a leak, take immediate action to control and repair it. Avoid the hazards of liquid nitrogen leaks to personnel and the environment.
Fire Prevention Measures: Liquid nitrogen has a low boiling and freezing point, which can easily cause fires. Measures such as setting up firewalls around low-temperature storage tanks and using fire-resistant coatings are taken to prevent fires from occurring and spreading.
Static Dissipation: Electrostatic buildup in low-temperature storage 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 low-temperature storage tanks and related equipment, including valves, pipes, pressure gauges, etc. Ensure that the equipment is in good condition without any damage, and promptly repair or replace any damaged parts.
Waste Gas Treatment: Low-temperature storage tanks generate waste gas during operation, which necessitates 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, ensuring safe operation and normal functioning of the tank. During the operation, it should be strictly followed the relevant operational procedures and safety requirements to avoid accidents.

The use of liquid oxygen storage tanks requires special attention to the following safety matters:
Training: Operators of liquid oxygen tanks must undergo training to understand the properties of liquid oxygen, safety operating procedures, and emergency response measures. Only trained personnel are authorized to handle liquid oxygen tanks.
Safety Operating Procedures: Establish and adhere to safe operating procedures for liquid oxygen storage tanks, including proper operational procedures, protective measures, and emergency response plans. Ensure operators follow the procedures to minimize accident risks.
Protective Measures: When using liquid oxygen tanks, it is mandatory to take necessary protective measures, such as wearing protective gloves and suits. Avoid direct contact with liquid oxygen to prevent frostbite.
Leakage Control: Regularly inspect the liquid oxygen storage tank for leaks and equip with leak detection and alarm systems. In case of a leak, immediate measures should be taken to control the leakage and carry out repairs.
Fire Prevention Measures: Liquid oxygen has a high oxygen content, which is prone to causing fires. Measures such as setting up fire barriers around liquid oxygen storage tanks and using fire-retardant coatings are taken to prevent fires from occurring and spreading.
Electrostatic Protection: The electrostatic buildup in liquid oxygen tanks may cause sparks, increasing the risk of fire. Measures such as using electrostatic conductive materials and antistatic equipment are taken to reduce the accumulation and release of static electricity.
Ventilation Requirements: Ensure adequate ventilation within the enclosed space of the liquid oxygen storage tank to expel vapors produced by the evaporation of liquid oxygen.
Shandong Zhongjie Special Equipment, welcome customers to visit our factory for cooperation discussions.