Shandong Zhongjie Special Equipment Co., Ltd. (formerly Heze Boiler Factory Co., Ltd.) was established in 2001, located at No. 2218 Jinnan Road, 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: boilers, deep-freezing 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. The company currently employs 710 people, including 247 engineering and technical staff 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 and New Enterprise in Shandong Province" by the Ministry of Industry and Information Technology. In June 2022, it was recognized as a "Gazelle Enterprise in Shandong Province" and in August 2022, as a "Specialized and New Small Giant Enterprise" by the Ministry of Industry and Information Technology.
When selecting low-temperature liquefied natural gas (LNG) storage tanks, the following factors should be considered:
Tank Types: Common LNG tank types include vertical fixed-roof tanks, spherical tanks, and horizontal tanks. Choose the appropriate tank type based on specific application requirements and site conditions.
Tanks Capacity: Determine the tank capacity based on the storage needs and estimated usage of LNG. The tank capacity should be sufficient to meet the anticipated storage duration and supply requirements.
Material Selection: LNG tanks commonly use low-temperature steel or nickel alloy materials to ensure corrosion resistance and strength in low-temperature environments. Select the appropriate material based on the tank's design pressure and temperature requirements.
Safety Performance: LNG tanks must have excellent safety performance, including seismic resistance, fire resistance, and leak control capabilities. The tanks should comply with relevant safety standards and regulations, such as API 620, EN 1473, etc.
Maintenance and Inspection: Consider the maintenance and inspection requirements of the storage tank, including internal cleaning, coating protection, and corrosion prevention measures. The design of the tank should facilitate maintenance and inspection operations to ensure long-term reliable operation.
Environmental Impact: When selecting LNG tanks, consider their impact on the surrounding environment. The layout and design of the tanks should comply with environmental protection requirements, reducing noise, vibration, and gas emissions, etc., to minimize environmental impact.
Cost-effectiveness: Considering the investment, operational, and lifecycle costs of the tank, choose a storage tank with a favorable cost-performance ratio.
需要注意的是，选型LNG储罐时应遵循相关的和地区的法规、标准和规范。此外，咨询的工程师或储罐制造商，以获取更详细和准确的选型建议。

When selecting welding materials for pressure vessels, several factors should be considered:
Material Matching: The selection of welding material 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 material with carbon steel base material, stainless steel welding material with stainless steel base material, etc.
Strength requirements: Select welding materials with sufficient strength based on the design requirements and operating conditions of the pressure vessel. The strength of the welding materials should match the base material to ensure that the strength of the weld joint does not become a weakness of the vessel.
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 Properties: The selection of welding materials should consider their welding properties, including penetration depth, weld bead shape, and crack resistance. The choice of welding materials should meet the requirements of the welding process and ensure the quality of the weld joints.
Related 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 should be noted that the selection of welding materials should be made 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 specifications. Additionally, manufacturers and suppliers often provide recommendations for welding material selection and technical support.

Operation procedures for liquid oxygen tanks should be established based on specific tank design and usage requirements. The following are some common contents of general operation procedures for liquid oxygen tanks: - Operator Training: Ensure operators have received relevant training for liquid oxygen tanks, understanding the tank's structure, performance, operation procedures, and safety considerations. - Safety Inspections: Conduct necessary safety checks before operating liquid oxygen tanks, including checking the tank's integrity, the sealing of valves and pipelines, and the condition of the insulation layer. - Liquid Oxygen Supply: Ensure the liquid oxygen supply system is functioning properly, including checking the status of liquid oxygen supply pipelines, valves, and pressure gauges, and ensuring an adequate supply. - Tank Pressure Control: Monitor the pressure of liquid oxygen tanks to ensure it remains within a safe range. Adjust pressure valves or pressure relief devices as necessary to control the tank pressure. - Leak Control: Regularly check the sealing of tanks and pipelines to ensure there are no leaks. In case of a leak, take immediate measures for leak control and notify relevant personnel. - Fire Prevention Measures: Prohibit open flames and prevent sparks and high-temperature objects from contacting the tank. Set up fire prevention facilities and fire extinguishing equipment, and conduct regular inspections and maintenance. - Safety Distance: Maintain a certain safety distance around liquid oxygen tanks to prevent the spread of fires, explosions, and leaks. - Maintenance and Repair: Regularly perform maintenance and repair on tanks, including cleaning the tank, checking the condition of the insulation layer, valves, and pipelines, to ensure normal operation. - Waste Disposal: Properly dispose of waste generated by liquid oxygen tanks, including residual liquid oxygen, waste gases, and waste liquids, following relevant environmental protection regulations and standards. Note that operation procedures for liquid oxygen tanks should be established based on specific tank design and usage requirements and comply with applicable regulations, standards, and safety guidelines. When operating liquid oxygen tanks, cooperate with local regulatory authorities and individuals to ensure the tank's safety and reliability.

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 trained and experienced personnel. Operators should be familiar with the tank's structure, performance, and operating procedures, and should 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 sources of sparks or high temperatures should be prohibited around liquid oxygen storage tanks. Fire protection facilities and firefighting equipment should be established and regularly inspected and maintained. - Leak Control: In the event of a leak in a liquid oxygen storage tank, immediate measures should be taken to control the leak. A leak can cause liquid oxygen to evaporate and increase oxygen concentration, raising the risk of fire and explosion. A leak detection system should be established, along with leak control devices and personal protective equipment. - Insulation Protection: Liquid oxygen storage tanks should have good insulation protection to reduce evaporation of liquid oxygen and maintain low temperatures. The insulation layer should be regularly inspected and maintained to ensure its integrity and insulating properties. - 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 based on local regulations and standards. - Regular Inspection 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.
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