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 operates seven business centers: boilers, deep-freeze containers, pressure vessels, central air conditioning, engineering installation, international trade, and the Internet of Things. It has three factory sites on Jinnan Road, East Changjiang Road, and Bohai Road, covering a total of 200,000 square meters, with the main workshop spanning 83,000 square meters. It currently employs 710 staff, including 247 engineers and technicians, and 82 intermediate-level technical personnel. 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 Department 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.
The inspection of liquid nitrogen tanks refers to the regular checks and maintenance performed on the tanks to ensure their safe operation and efficient use. Here is a common introduction to the inspection of liquid nitrogen tanks:
Visual Inspection: Regularly inspect the exterior of the storage tank, including the tank body, insulation layer, valves, and pipelines, etc. Note any cracks, corrosion, wear, or other damage. Also, check that the insulation layer is intact with no damage or detachment.
Level Check: Regularly inspect the liquid nitrogen tank's level to ensure it's within the normal range. This can be done using a level gauge or a level scale and other equipment.
Pressure Check: Inspect the tank's pressure to ensure it is within the safe range. Pressure gauges or pressure sensors can be used for the check.
Leak Inspection: Check for signs of liquid nitrogen leakage around the storage tank, such as vapor fog, frost, or freezing. If leakage is detected, take immediate measures to repair it.
Valve and Pipeline Inspection: Verify that the tank's valves and pipelines are functioning properly, free of any gas leaks or blockages. Ensure the valves and pipelines are sealed and unobstructed.
Safety Equipment Inspection: Examine the safety equipment of the storage tank, such as pressure relief valves, temperature sensors, and level alarms, to ensure they are functioning properly.
Maintenance Records: Timely document the inspection results and maintenance records of the storage tank, including liquid levels, pressure, insulating layer conditions, and leakage situations. These records aid in monitoring the tank's operational status and promptly identifying issues.
It's important to note that the inspection of liquid nitrogen tanks should comply with relevant safety regulations and operational guidelines. Liquid nitrogen is highly flammable at low temperatures, so operators must wear appropriate personal protective equipment and ensure the operation environment is free of ignition sources. Regular inspections help identify issues promptly and take corrective actions, ensuring the safe and efficient operation of the tank.

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. Select the appropriate tank type based on specific application requirements and site conditions.
Tank Capacity: Determine the tank capacity based on the storage requirements and anticipated usage of LNG. The tank capacity should be sufficient to meet the expected storage duration and supply needs.
Material Selection: LNG tanks are typically made of low-temperature steel or nickel alloys 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 should have excellent safety performance, including seismic resistance, fire resistance, and leakage control capabilities. The tanks must comply with relevant safety standards and specifications, such as API 620, EN 1473, etc.
Maintenance and Inspection: Consider the maintenance and inspection requirements of the tank, including internal cleaning, coating protection, and corrosion prevention measures. The tank design 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, minimizing noise, vibration, and gas emissions, etc.
Cost-effectiveness: Considering the investment, operational, and lifecycle costs of the tank, select a 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。

To extend the service life of low-temperature liquid storage tanks, the following measures can be taken:
Regular Inspections and Maintenance: Conduct periodic visual inspections of the storage tank, including the shell, welds, valves, and connections, etc. Check for any abnormal conditions such as cracks, corrosion, or deformation, and promptly repair or replace damaged parts.
Maintain Insulation: Insulation is crucial for the thermal retention of low-temperature liquid storage tanks. Regularly inspect the integrity and insulating properties of the insulation, repair or replace damaged insulation materials to ensure the tank's insulating effectiveness.
Control temperature and pressure: The temperature and pressure of low-temperature liquid storage tanks should be maintained within a safe range. Avoid excessive or low temperatures and pressures that could damage the tank. Implement appropriate cooling or heating measures to ensure stable temperature and pressure of the liquid.
Corrosion Protection: The tank's shell and internal structure should be treated with corrosion protection to prevent rust and oxidation. Regularly inspect and maintain the protective coating to ensure its integrity.
Avoid excessive pressure and overfilling: Prevent the internal pressure of the tank from being too high or too low, as well as overfilling with liquid. Excessive pressure and overfilling can lead to structural cracks or damage to the tank.
Regular cleaning and waste removal: Regularly clean the interior of the tank to remove accumulated impurities and dirt. Regularly remove waste to prevent damage to the tank from impurities and sediments in the liquid.
Safety Operation and Training: Ensure operators are knowledgeable and skilled in the safe handling of cryogenic liquid storage tanks. Enhance safety training to boost operators' awareness and emergency response capabilities.
Manage records and documents: Establish comprehensive management records and documents, including the usage of storage tanks.

The installation of the safety valve on liquid oxygen storage tanks is a crucial component ensuring that the tank can release pressure in a timely manner during overpressure situations, protecting the tank and related equipment. The following are the steps for installing the safety valve on a liquid oxygen storage tank:
Determine the rated pressure of the safety valve: Select an appropriate safety valve based on the design pressure and flow requirements of the liquid oxygen storage tank. Ensure that the rated pressure of the safety valve meets the tank's specifications and complies with relevant safety standards and regulations.
Valve Installation Location: Select an appropriate location for installing the safety valve. Typically, the safety valve should be mounted on the top or side of the liquid oxygen tank to allow for timely pressure release in the event of overpressure.
Prepare installation interfaces: Prepare the corresponding interfaces based on the connection method of the safety valve. This may include welding interfaces, threaded interfaces, or flange interfaces, etc. Ensure the tightness and firmness of the connections.
Install the safety valve: Mount the safety valve onto the prepared interface. Follow the installation instructions for the safety valve to ensure proper connection and tightening.
Adjustment and Testing: After installation, adjust and test according to the requirements of the safety valve. Ensure that the opening and closing pressures of the safety valve meet the design specifications, and conduct a leak test to ensure its sealing.
Connect exhaust piping: The exhaust piping of the safety valve should be properly connected to the outlet of the safety valve. The exhaust piping should have sufficient diameter and flow capacity to ensure effective exhaust of overpressure gas when the safety valve is opened.
Identification and Record: Label safety valves and discharge pipes with relevant information such as rated pressure, flow rate, and installation date. Additionally, record the installation details and test results of the safety valves for future reference and maintenance.
When installing the safety valve on the liquid oxygen storage tank, it is imperative to follow relevant safety regulations and operation guidelines. If lacking relevant experience and knowledge, it is advisable to seek assistance and guidance from experts to ensure the correct installation and reliable operation of the safety valve.
Our company places great emphasis on technological innovation and R&D design. We have one city-level enterprise technology center in Heze City, equipped with testing facilities for non-destructive testing, physical and chemical testing, welding testing, hydrostatic testing, etc. We have over 600 various instruments and equipment, including CNC machine tools, X-ray flaw detectors, digital ultrasonic flaw detectors, mechanical property testing machines, chemical analyzers, spectrometers, tensile testing machines, plasma welding machines, and more. The key products we have developed, such as welding technology for temperature and pressure vessels, emissions reduction in biomass boilers, and waste heat recovery, have successively been included in multiple Shandong Provincial Department of Industry and Information Technology innovation projects, Shandong Provincial key projects, and Heze City innovation and excellence projects. We have cumulatively obtained 27 authorized utility models, 16 authorized inventions, participated in drafting 2 standards, 2 industry standards, and registered 15 trademarks. The technical team of our company, in collaboration with Professor Yajiang Li from Shandong University, has developed deep cryogenic container processing technology using the international plasma arc + filler wire tungsten inert gas (PAW-GTAW) welding technology. After provincial-level scientific and technological achievement appraisal, the technical level has reached an international standard in the field of deep cryogenic container manufacturing. Choose Zhongjieteqiang, let's join hands to create brilliance together!