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 and GC2/Class pressure pipeline installation licenses, as well as an equipment and machinery installation contracting qualification. It is a member of the China Boiler and Water Treatment Association, the China Chemical Equipment Association, and a director unit of the Shandong Equipment Manufacturing Association. The company has also passed certifications for the ISO9001 Quality Management System, ISO14001 Environmental Management System, OHSAS18001 Occupational Health and Safety Management System, and the U.S. ASME/U2 certification.
When cleaning low-temperature liquid storage tanks, the following steps should be taken:
Safety Preparations: Prior to cleaning, ensure there are no remaining liquids or gases inside the tank, and that the tank has been properly emptied and vented. Wear appropriate personal protective equipment, such as protective suits, gloves, and safety shoes.
Cleaning Agent Selection: Choose a cleaner suitable for low-temperature environments and liquid storage tank materials. Common cleaners include acidic and alkaline solutions, organic solvents, or specialized cleaners. Select the appropriate cleaner based on the tank material and the nature of the contaminants.
Washing Process: Inject the cleaning agent into the tank and clean the inner wall of the tank using appropriate tools (such as sprayers, brushes, or high-pressure water). Wash as many times as necessary to ensure all contaminants are removed.
Washing and Discharging: After cleaning, rinse with clean water or an appropriate solvent to remove all cleaning agents and residues. Ensure the tank is dry inside and discharge the rinse water into an appropriate treatment system.
Inspection and Verification: After cleaning, inspect the tank to ensure no residues of contaminants remain inside. Appropriate detection equipment or methods, such as optical inspection, chemical analysis, or ultrasonic testing, can be used to verify the cleaning effectiveness.
It's important to follow relevant safety regulations and operational guidelines when cleaning low-temperature liquid storage tanks. These tanks typically have high flammability and low-temperature properties, so operators must strictly adhere to safety procedures to ensure the safety of personnel and equipment. During cleaning, precautions should be taken to prevent leaks of cleaning agents and contaminants, and appropriate measures should be taken for their handling and disposal.

Low-temperature industrial gas filling stations are equipment used to fill liquid low-temperature industrial gases (such as liquid oxygen, liquid nitrogen, liquid argon, etc.) into gas storage tanks. Below is some basic knowledge about low-temperature industrial gas filling stations:
Storage Tank Type: Low-temperature industrial gas tanks typically use double-walled vacuum insulated tanks, with the inner wall for storing liquefied gas and the outer wall for insulation to reduce heat transfer and evaporation losses of the liquid gas.
Filling Equipment: Low-temperature industrial gas storage tank filling stations include liquid-gas filling pumps, filling pipelines, flowmeters, pressure sensors, and other equipment. The liquid-gas filling pump is used to extract liquid gas from storage tanks or gas holders and fill it into the target storage tank.
Filling Process: The operational procedure at the filling station typically includes the following steps: preparation (checking equipment, preparing filling medium), equipment connection (connecting filling pumps, pipes, etc.), equipment activation (starting the filling pump, adjusting flow and pressure), filling operation (filling liquid gas into the target storage tank), monitoring and control (monitoring parameters such as pressure and flow during the filling process to ensure safety and quality), and completion of operation (shutting down equipment, cleaning the work area).
Safety Measures: Strict adherence to relevant safety operating procedures and standards is required during the operation of low-temperature industrial gas storage tank filling stations. Operators must receive training to understand the properties and safety precautions of liquid gases. Additionally, filling stations should be equipped with safety equipment such as pressure sensors and safety valves to ensure safety during the filling process.
Quality Control: Quality control is mandatory at the filling station during the filling process, involving monitoring parameters such as flow rate, pressure, and temperature of the filling medium to ensure accuracy and quality of the filling.
It's important to note that the operation of low-temperature industrial gas storage tank filling stations must be carried out by trained personnel and strictly adhere to the relevant operational procedures and safety measures. Additionally, the design and manufacture of filling stations must comply with applicable standards and regulations to ensure the safety and reliability of the equipment.

Several reasons have put low-temperature liquid storage tanks at the peak in recent years:
Rising Demand: As industries and scientific research sectors continue to develop, the demand for cryogenic liquids is on the rise. Cryogenic liquid storage tanks can effectively store and supply cryogenic liquids such as liquid oxygen, liquid nitrogen, and liquid gases, meeting the needs of various fields.
Technical Advancements: In recent years, the manufacturing and material technologies for low-temperature liquid storage tanks have undergone continuous improvement and innovation. The application of new insulation 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 device, have garnered more attention and applications.
Emerging Application Fields: The demand for low-temperature liquid storage tanks is on the rise in emerging application fields. For instance, the application of liquid nitrogen in frozen food, biopharmaceuticals, and semiconductor manufacturing is becoming increasingly widespread, propelling 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 new application areas, and policy support. These factors collectively drive the rapid growth of the low-temperature liquid storage tank industry.

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 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. Hence, it is crucial to avoid direct contact with liquid nitrogen, especially with the skin. Use tools or equipment for handling to prevent direct hand contact with liquid nitrogen.
Ventilation Requirements: In the operation 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 cryogenic tank for leaks and equip with leak detectors and alarm systems. In case of a leak, take immediate measures 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 is prone to cause fires. To prevent and contain fires, firewalls and fire-resistant coatings are set up around low-temperature storage tanks.
Static protection: The accumulation of static electricity 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 status of low-temperature storage tanks 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: Low-temperature storage tanks produce waste gas during operation, and appropriate waste gas treatment measures must be taken 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 the operation, it is essential to strictly follow the relevant operational procedures and safety operation requirements to prevent accidents.
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