Shandong Zhongjie Special Equipment Co., Ltd. specializes in: fuel (gas) boilers, organic heat carrier boilers, biomass boilers, waste heat recovery boilers, and other boiler products; vacuum insulation cryogenic pressure vessels such as LNG tanks, oxygen/nitrogen/argon tanks, and CO2 tanks; pressure vessel products including denitrification engineering equipment, heat storage and energy storage equipment, and 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.
Daily inspections and maintenance of liquid oxygen storage tanks are crucial for ensuring safe operation. Here are general steps for daily inspections and maintenance of liquid oxygen storage tanks:
Appearance Inspection: Regularly inspect the exterior of the tank, including the shell, welds, valves, and connections, etc. Pay attention to any abnormal conditions such as cracks, corrosion, or deformation.
Leak Detection: Utilize appropriate leak detection equipment to inspect for leaks in tanks and connection points. Leak detection can be conducted using methods such as gas detectors or liquid oxygen detection agents.
Pressure Testing: Conduct regular pressure tests to inspect the tank's sealing and pressure resistance. Perform pressure tests according to relevant standards and regulations, and record the test results.
Valve and Fitting Inspection: Check if the valves and fittings on the tank are functioning properly and look for any signs of loosening or damage. Ensure the valves operate smoothly and reliably.
Insulation Layer Inspection: Verify that the storage tank's insulation is intact and free from damage or detachment. Repair or replace any damaged insulation material to ensure effective insulation.
Cleaning and Drainage: Regularly clean the interior of the tank to remove accumulated impurities and dirt. Regularly drain to prevent contaminants and sediments in liquid oxygen from damaging the tank.
Safety Equipment Inspection: Check the safety equipment around the storage tanks, such as fire separation zones and alarm systems, to ensure they are functioning properly.
Record and Document Management: Document the results of each inspection and maintenance, including the inspection date, content, issues found, and measures taken. Establish comprehensive management records and documents for tracking and managing the tank's operational status.
Note that inspections and maintenance of liquid oxygen tanks should be conducted by trained personnel, following relevant regulations and standards. Ensure safety during maintenance and operation, and consult with experts for accurate guidance.

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. Here are the basic facts about low-temperature industrial gas filling stations:
Tank Type: Low-temperature industrial gas tanks typically use double-walled vacuum insulated tanks, with the inner wall for storing liquid 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 pumps are used to extract liquid gas from storage tanks or gas storage tanks and fill it into the target storage tank.
Filling Process: The operation 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 undergo 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 must be conducted during the filling process at the filling station, including 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 conducted 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.

Before using the liquid oxygen tank, the following preparations must be made:
Safety Inspections: Ensure the tank and its surrounding environment are safe. Check for any damage, leaks, or other safety hazards on the tank. Confirm that there are no flammable materials or other hazardous items around the tank.
Tank Preparation: Inspect the tank's exterior, including the shell, welds, valves, and fasteners. Ensure there are no visible damages or corrosion. Check that the insulating layer of the tank is intact and undamaged.
Liquid Oxygen Filling: Utilize liquid oxygen delivery equipment to fill the storage tank. Ensure that the flow rate and pressure of the liquid oxygen are maintained within a safe range during the filling process.
Pressure Control: Storage tanks should be equipped with pressure control devices to ensure the internal pressure of the tank remains within a safe range. Inspect and adjust the pressure control devices to ensure proper operation.
Valve Operation: Check that the tank's valves and connections are functioning properly. Ensure the valves operate smoothly and reliably. Adjust the opening and closing states of the valves as needed.
Safety Equipment: Inspect the safety equipment around the storage tank, such as fire separation zones and alarm systems, to ensure they are functioning properly.
Operator Training: Ensure operators are proficient in the safe operation of liquid oxygen storage tanks.

Several factors need to be considered when determining the design pressure and calculated pressure for a liquid oxygen storage tank:
Design Pressure: Design pressure refers to the maximum pressure a tank can withstand under normal operating conditions. When determining the design pressure, factors such as the working pressure range of liquid oxygen, the material strength of the tank, and safety factors must be considered. Generally, the design pressure should be slightly higher than the high working pressure of liquid oxygen to ensure the tank's safety and reliability within the normal operating range.
Calculated Pressure: The calculated pressure refers to the actual working pressure of the tank under the design pressure. The calculated pressure is determined based on factors such as the properties of liquid oxygen, the geometric shape of the tank, and the material strength. The calculated pressure should consider factors like the expansion coefficient of liquid oxygen, temperature changes, and pressure fluctuations to ensure the safety and stability of the tank under actual working conditions.
Determining the design pressure and calculation pressure of liquid oxygen storage tanks usually requires reference to relevant standards and specifications, such as Standard GB150 "Steel Pressure Vessels" and GB18442 "Technical Conditions for Storage Tanks of Liquid Oxygen, Liquid Nitrogen, and Liquid Argon." These standards and specifications provide detailed design and calculation methods to ensure the safety and reliability of the tanks.
In practical application, the design and calculated pressures of the liquid oxygen storage tank should be calculated and determined by the pressure vessel designer. They will take comprehensive consideration of factors such as specific engineering requirements, tank dimensions, materials, etc., to ensure the tank's design and use comply with relevant safety standards and regulations.
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