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 like denitrification engineering equipment, heat storage and energy storage equipment, complete chemical equipment sets; central air conditioning and HVAC 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.
Nitrogen charging of liquid nitrogen tanks refers to the process of injecting nitrogen gas into the tank to increase the nitrogen concentration and pressure inside, in order to meet certain safety requirements and operational objectives. Here are some precautions to consider when nitrogen charging liquid nitrogen tanks:
Safe Operation: Prior to nitrogen charging operations on liquid nitrogen tanks, it is mandatory that operators possess relevant safety knowledge and skills. Operators must 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 have adverse effects on the liquid nitrogen within the tank.
Nitrogen Inerting Speed Control: During the nitrogen inerting process, the speed of nitrogen inerting should be controlled to avoid being too fast or too slow. Too fast a speed may lead to excessive internal pressure within the tank, while too slow a speed may result in extended inerting time.
Pressure Monitoring: During the nitrogen blanketing process, the internal pressure of the storage tank should be monitored regularly. Ensure that the pressure within the tank remains within a safe range and adjust as necessary.
Temperature Control: During the nitrogen purge process, it is crucial to monitor and control the temperature of the storage tank. The low temperature of liquid nitrogen can cause condensation and frost on the tank and pipelines. Appropriate measures, such as heating or insulation, should be taken to prevent condensation and frost formation.
Post-nitrogen flushing treatment: After completing the nitrogen flushing operation, promptly shut down the flushing unit and inspect and clean the storage tank. Ensure there is no residual nitrogen or impurities inside the tank.
Note: Nitrogen charging operations for liquid nitrogen tanks must strictly adhere to the relevant safety standards.

Liquid oxygen tanks are high-pressure, highly oxidizing equipment that requires special attention to safety during use. Here are some safety precautions for liquid oxygen tanks: Operation: The operation of liquid oxygen tanks should be carried out by trained and experienced personnel. Operators should be familiar with the tank's structure, performance, and operating procedures, and operate strictly according to the 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 tanks to prevent sparks and contact with the tank. Fire protection equipment and fire extinguishers should be installed, and regular inspections and maintenance should be conducted. Leakage Control: In the event of a leak in a liquid oxygen tank, immediate measures should be taken to control the leak. A leak can lead to the evaporation of liquid oxygen and an increase in oxygen concentration, increasing the risk of fire and explosion. A leak detection system should be established, and leakage control devices and personal protective equipment should be equipped. Insulation Protection: Liquid oxygen tanks should have good insulation protection to reduce the 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 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 tanks should be regularly inspected and maintained, including checking the structural integrity of the tank, valves, and pipelines for tightness.

To ensure the quality of liquid oxygen tanks, the following measures can be taken:
选择可靠的供应商：选择有资质和经验的储罐制造商或供应商，确保其具备良好的声誉和可靠的质量管理体系。
Adhere strictly to relevant standards and regulations: The design, manufacturing, and installation of liquid oxygen tanks shall comply with the relevant standards and regulations, such as standards, industry standards, or.
Quality Control and Inspection: Rigorous quality control and inspection are conducted throughout the manufacturing process, including raw material inspection, process monitoring, and finished product testing. Ensure that the materials, welding, and sealing of the storage tanks meet the required standards.
A robust quality management system: Establish and implement a comprehensive quality management system, including quality control plans, quality inspection records, and quality training, to ensure each stage meets quality standards.
Regular maintenance and inspection: Regular maintenance and inspection of the liquid oxygen storage tank are carried out, including cleaning, coating protection, and anti-corrosion treatment, to extend the lifespan of the tank and maintain its optimal working condition.
Safe Operation and Management: Establish and implement safety operation and management systems, including the correct use of storage tanks, operational procedures, and safety training, to ensure the safety and reliability of storage tanks during use.
Regular inspections and evaluations: Conduct regular inspections and evaluations of liquid oxygen tanks, including visual inspections, pressure tests, leak detection, and as needed, non-destructive testing and material analysis, to ensure the quality and safety of the tanks.
By implementing the above measures, we can effectively ensure the quality of liquid oxygen tanks, enhance their reliability and safety, and meet usage requirements and standards.

When selecting welding materials for pressure vessels, several factors need to be considered:
Material Matching: The selection of welding materials should match the base material of the pressure vessel to ensure the strength and corrosion resistance of the weld joint. Common material matches include carbon steel welding materials with carbon steel base materials, stainless steel welding materials with stainless steel base materials, and so on.
Strength Requirements: Select welding materials with adequate strength based on the design requirements and operating conditions of the pressure vessel. The strength of the welding material should match the base material to ensure that the weld joint strength does not become a weak point of the container.
Corrosion Resistance: Select welding materials with excellent corrosion resistance based on the working environment and medium of the pressure vessel. For instance, pressure vessels operating in corrosive media may require the use of stainless steel welding materials with superior corrosion resistance.
Welding Performance: The selection of welding material should consider its welding performance, including penetration depth, weld bead shape, crack resistance, etc. The chosen material should meet the requirements of the welding process and ensure the quality of the weld joints.
Applicable Standards and Regulations: When selecting welding materials, refer to relevant standards and regulations, such as the ASME Boiler and Pressure Vessel Code, AWS (American Welding Society) standards, etc. These standards and regulations provide guidance and requirements for the selection of welding materials.
It is important to note that the selection of welding materials should be conducted by a welding engineer or a qualified welder. They can choose the appropriate materials based on specific application requirements, working conditions, and safety standards, in conjunction with relevant regulations and specifications. Moreover, manufacturers and suppliers often provide welding material selection advice and technical support.
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