Shandong Zhongjie Special Equipment's main products include: fuel (gas) boilers, organic heat carrier boilers, biomass boilers, waste heat boilers, and other boiler products; vacuum insulation cryogenic pressure vessels such as LNG tanks, oxygen/nitrogen/argon tanks, CO2 tanks; pressure vessel products such as denitrification engineering equipment, heat storage and energy storage equipment, complete chemical equipment sets; central air conditioning and ventilation equipment such as ground (water) source heat pumps, air source units, water-cooled screw units, and air-cooled modular units. Planned products include large-scale energy centers, LNG transport vehicles, LNG tank containers, and other green energy equipment.
In the degreasing process of high-vacuum pipelines in low-temperature liquid storage tanks, the following steps can be taken:
Preparation: Ensure the cleaning and readiness of the degreasing equipment and tools. Check the pipeline system's connections and sealing, ensuring no leaks.
Pipe Cleaning: Use appropriate cleaning agents and tools to clean pipes, removing surface dirt and grease. Methods such as mechanical brushing, high-pressure water jetting, or chemical cleaning can be employed.
De-greasing Process: Select an appropriate de-greaser and inject it into the pipeline system. The de-greaser can be an organic solvent or an alkaline solution, the choice depending on the pipeline material and type of dirt. Ensure the de-greaser fully covers the inner pipeline walls and maintains a certain contact time.
Flush Pipeline: Drain the degreaser from the pipeline system and flush with clean water to remove any remaining degreaser and dirt. During the flushing process, high-pressure water or gas can be used for rinsing to ensure the cleanliness of the pipeline interior.
Drying Pipe: Utilize drying equipment or ventilation systems to evaporate or exhaust moisture from within the pipe, ensuring the interior surface is dry. Drying can be achieved using hot air or nitrogen.
Inspection and Testing: After degreasing, inspect and test the pipelines to ensure cleanliness and sealing. Visual inspections, pressure tests, or other relevant tests can be conducted.
Be mindful that when descaling high-vacuum pipelines of low-temperature liquid storage tanks, adhere to relevant safety operation procedures and guidelines. Ensure operators possess the necessary safety awareness and operational skills to prevent accidents.

Liquid oxygen storage tanks are high-pressure, highly oxidizing equipment that require special attention to safety during use. Here are some safety precautions for liquid oxygen storage tanks: Operation: The operation of liquid oxygen storage tanks should be carried out by personnel who have been trained and possess relevant experience. Operators should be familiar with the tank's structure, performance, and operational procedures, and operate strictly according to the operation manual and safety regulations. Fire Prevention Measures: Liquid oxygen is highly oxidizing and can easily cause fires and explosions. Open flames and hot objects should be prohibited around liquid oxygen storage tanks to prevent sparks and contact with the tank. Fire prevention facilities and firefighting equipment should be established, and regular inspections and maintenance should be conducted. Leakage Control: In the event of a leakage in a liquid oxygen storage tank, immediate measures should be taken to control the leakage. Leakage can lead to the evaporation of liquid oxygen and an increase in oxygen concentration, raising the risk of fire and explosion. A leakage alarm system should be set up, and leakage control devices and personal protective equipment should be provided. Insulation Protection: Liquid oxygen storage tanks should have good insulation protection to reduce evaporation of liquid oxygen and maintain a low temperature state. The insulation layer should be inspected and maintained regularly to ensure its integrity and insulation performance. Safety Distance: A certain safety distance should be maintained around liquid oxygen storage tanks to prevent the spread of fires, explosions, and leaks. The specific requirements for safety distances should be assessed and determined according to local regulations and standards. Regular Inspections and Maintenance: Liquid oxygen storage tanks should be regularly inspected and maintained, including checking the structural integrity of the tank, valves, and pipelines for tightness.

Nitrogen charging of liquid nitrogen tanks refers to the process of injecting nitrogen gas into the tank to increase the concentration and pressure of nitrogen inside, in order to meet certain safety requirements and operational objectives. Here are some precautions to consider when nitrogen charging liquid nitrogen tanks:
Safety Operation: Prior to conducting nitrogen charging operations on liquid nitrogen tanks, it is mandatory that operators possess relevant safety knowledge and skills. Operators should wear appropriate personal protective equipment, such as safety goggles, gloves, and protective clothing.
Nitrogen Quality: Utilize high-purity nitrogen for inerting operations to ensure the quality and purity of the nitrogen. Low-purity nitrogen may contain impurities or oxygen, which could negatively affect the liquid nitrogen within the storage tank.
Nitrogen Inerting Speed Control: During the nitrogen inerting process, the nitrogen inerting speed should be controlled to avoid being too fast or too slow. A too fast nitrogen inerting speed can lead to excessive internal pressure within the tank, while a too slow speed can result in extended inerting time.
Pressure Monitoring: During the nitrogen filling process, regular monitoring of the internal pressure changes within the storage tank is required. Ensure that the internal pressure of the tank remains within the safe range and adjust as necessary.
Temperature Control: During the nitrogen purge process, attention should be given to controlling the temperature of the storage tank. The low temperature of liquid nitrogen can lead to condensation and dew on the tank and pipelines. Appropriate measures, such as heating or insulation, should be taken to prevent condensation and dew.
Post-nitrogen flushing treatment: After the nitrogen flushing operation is completed, the flushing device should be promptly turned off, and the tank should be inspected and cleaned. Ensure that there is no residual nitrogen or impurities inside the tank.
Note: Nitrogen charging operations for liquid nitrogen tanks must strictly adhere to relevant safety standards.

Protective techniques for liquid nitrogen tanks include the following:
Wear protective gear: When operating liquid nitrogen tanks, it is mandatory to wear appropriate protective gear, including protective gloves, suits, and non-slip shoes. This gear protects 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 utensils for handling to prevent direct hand contact with liquid nitrogen.
Note Ventilation: Ensure good ventilation in the operation area of the liquid nitrogen tank to exhaust 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 liquid nitrogen storage tank for leaks and equip with leak detectors and alarm systems. In case of a leak, take immediate action to control and repair it. Avoid harm to personnel and the environment caused by liquid nitrogen leaks.
Fire Prevention Measures: Nitrogen liquid has a low boiling and freezing point, which is prone to causing fires. To prevent and contain fires, firewalls and fire-retardant coatings should be installed around nitrogen liquid storage tanks.
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 related equipment, including valves, pipelines, pressure gauges, etc. Ensure that the equipment is in perfect condition and promptly repair or replace any damaged parts.
Waste Gas Treatment: Liquid nitrogen tanks produce waste gas during use, which must be properly treated.
Zhongjie Special Equipment upholds the great vision of "realizing employees' dreams, creating customer value, and striving for the prosperity and strength of our motherland," and is dedicated to the development of the green energy equipment industry. We offer society products and services with high cost-performance!