Shandong Zhongjie Special Equipment (formerly Heze Boiler Factory Co., Ltd.) holds an A-grade boiler manufacturing license, an A2-grade pressure vessel manufacturing license, an A2-grade pressure vessel design license, a B-grade boiler installation license, and GB2/Class, GC2/Class pressure pipeline installation licenses, as well as a mechanical and electrical equipment installation contracting qualification. It is a member of the China Boiler and Water Treatment Association, the China Chemical Equipment Association, and the council member of the Shandong Equipment Manufacturing Association. The company has also passed the ISO9001 Quality Management System, ISO14001 Environmental Management System, OHSAS18001 Occupational Health and Safety Management System certifications, and the American ASME/U2 certification.
Maintaining and caring for liquid nitrogen tanks is crucial for ensuring their safe operation and extending their lifespan. Here are the maintenance and care methods for liquid nitrogen tanks:
Regular Inspections: Conduct regular inspections of the exterior and interior condition of the liquid nitrogen storage tank, including checking for leaks, corrosion, wear, or other damage. Pay special attention to inspecting the tank's interfaces, valves, and pipelines to ensure their proper operation.
Cleaning and Defrosting: Regularly clean the exterior surface of the liquid nitrogen storage tank to remove dust and dirt. In case of ice or frost buildup inside the tank, defrosting is required to maintain the tank's normal operating condition.
Level Monitoring: Regularly monitor the liquid nitrogen storage tank's level to ensure the stored amount of liquid nitrogen remains within a safe range. In case of an abnormal level, adjustments or supplements of liquid nitrogen must be made promptly.
Regular inspection and replacement of parts: Regularly inspect and replace critical components of liquid nitrogen storage tanks, such as safety valves, pressure sensors, and temperature sensors, to ensure their proper operation and accuracy.
Inspect the Insulation: Regularly check the liquid nitrogen tank's insulation to ensure its integrity and insulating performance. If any damage or aging of the insulation is found, it should be repaired or replaced promptly.
Regular Calibration: Regularly calibrate the gauges and sensors of liquid nitrogen tanks to ensure accuracy and reliability. Calibration should be conducted according to relevant standards and specifications.
Safety Training and Operating Procedures: Conduct regular safety training for liquid nitrogen storage tanks to ensure operators are familiar with the safe operating procedures and emergency response measures.
It is important to note that maintenance and care of liquid nitrogen tanks should be performed by trained and authorized personnel. Adhere to relevant safety regulations and operation guidelines to ensure the safety and effectiveness of maintenance work.

To prevent hazards caused by static electricity in liquid oxygen storage tanks, the following measures can be taken:
Ensure proper grounding of the liquid oxygen tank and related equipment. Grounding releases static electricity to the ground, reducing the likelihood of static buildup. Metal components such as tanks and pipelines should be connected to a reliable grounding system.
Electrostatic Conductive Materials: Utilize electrostatic conductive materials to reduce static charge buildup. For instance, apply conductive coatings or materials on the insulating layer of liquid oxygen tanks and pipelines to discharge static electricity to the ground.
Static Dissipative Equipment: Utilize static dissipative equipment, such as static-conductive pipes and hoses, to reduce the accumulation and discharge of static electricity. These devices help direct static to the ground, minimizing the occurrence of static sparks.
Static grounding wire: Install static grounding wires on liquid oxygen tanks and related equipment to discharge static electricity to the ground. These grounding wires should be connected to a reliable grounding system and checked and maintained regularly.
Electrostatic Discharger: Utilize an electrostatic discharger to eliminate static electricity. It neutralizes static by releasing opposite charges, reducing the buildup of static and the occurrence of sparks.
Electrostatic Safety Training: Provide electrostatic safety training for personnel handling liquid oxygen tanks to enhance their awareness and prevention of electrostatic hazards. Training content can include the principles of electrostatic formation, preventive measures, and emergency response procedures.
It should be noted that the electrostatic precautions for liquid oxygen tanks should be designed and implemented by personnel, following relevant safety operating procedures and standards. During operation, operations should be strictly conducted according to the prescribed procedures to avoid the generation of static sparks, ensuring the safety of the tank.

The operational and protective procedures for the use of low-temperature liquid nitrogen storage tanks should include the following:
Staff Training: All operators must undergo safety training for liquid nitrogen storage tanks, understanding the properties, hazards, proper operating procedures, and emergency response measures.
Protective Gear: Operators must wear appropriate protective gear, including gloves, protective clothing, and non-slip shoes, to safeguard against the low temperatures of liquid nitrogen and other hazards.
Ventilation Requirements: Sufficient ventilation must be maintained in the operational area of the liquid nitrogen tank to expel gases produced by the evaporation of liquid nitrogen. Avoid excessive oxygen concentration to reduce the risk of fire and explosion.
Leak Control: Tanks must be equipped with leak detection and alarm systems to promptly identify and control the leakage of liquid nitrogen. Upon detection of a leak, immediate measures should be taken to control the source of the leak and to carry out repairs.
Fire Prevention Measures: Nitrogen liquid has a low boiling and freezing point, which is prone to cause fires. To prevent and contain fires, fire walls and fire-resistant coatings should be installed around nitrogen liquid storage tanks.
Static protection: Electrostatic buildup in liquid nitrogen tanks can cause sparks, increasing the risk of fire. Measures such as using static-conductive materials and anti-static equipment are 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, pipes, pressure gauges, etc. Ensure the equipment is in perfect condition and promptly repair or replace any damaged parts.
Waste Gas Treatment: Nitrogen liquid storage tanks generate waste gas during operation, which requires appropriate waste gas treatment measures to prevent harm to the environment and human health.
Emergency Response Plan: Develop an emergency response plan for liquid nitrogen tanks, including procedures for handling leakage accidents, emergency rescue measures, and protocols for notifying relevant departments. Operators

One of the common drawbacks of pressure vessels during use is corrosion. Corrosion refers to the reaction between the metal surface and chemical substances in the environment, leading to damage to the metal surface and thinning of the material. The following are common corrosion drawbacks of pressure vessels:
Pitting Corrosion: Pitting corrosion refers to localized pits or holes that appear on the surface of a metal. This type of corrosion is usually caused by corrosive substances present in the local environment, such as acids, salts, etc.
Bacterial Corrosion: Bacterial corrosion is a phenomenon caused by microorganisms. These organisms can form a biofilm inside pressure vessels and produce acidic substances, leading to corrosion of the metal surface.
Punch Corrosion: Punch corrosion refers to a penetrating corrosion phenomenon on the metal surface. This type of corrosion usually occurs due to the damage or defect of the protective layer on the metal surface, allowing corrosive substances to directly contact the metal.
Stress Corrosion Cracking: Stress corrosion cracking occurs when a metal surface is simultaneously subjected to stress and a corrosive environment, leading to the formation and propagation of cracks. This type of corrosion is often found in pressure vessels under high stress and corrosive conditions.
Corrosion can lead to material thinning and reduced strength in pressure vessels, potentially causing severe consequences such as leaks or ruptures. Therefore, the following measures should be taken to address the corrosion issue in pressure vessels:
Regularly inspect and evaluate the corrosion condition of pressure vessels, including methods such as visual inspections and non-destructive testing.
Take anti-corrosion measures, such as coating protection, cathodic protection, and appropriate material selection, to minimize the occurrence and progression of corrosion.
Regularly clean and maintain pressure vessels to remove dirt and impurities that may cause corrosion.
Comply with relevant safety regulations and operational guidelines to ensure the safe and proper operation of pressure vessels.
For severely corroded pressure vessels, repairs or replacements may be necessary to ensure their safety and reliability.
Our company places great emphasis on technological innovation and R&D, boasting one municipal-level enterprise technology center in Heze City. We have established testing facilities for non-destructive testing, physical and chemical testing, welding testing, hydrostatic testing, and more. Equipped with over 600 various instruments and equipment such as CNC machine tools, X-ray flaw detectors, digital ultrasonic flaw detectors, mechanical property testing machines, chemical analyzers, spectrometers, tensile testing machines, and plasma welding machines, our key products and technologies such as welding for temperature and pressure vessels, biomass boiler emissions reduction, and waste heat utilization have successively been selected for multiple Shandong Provincial Department of Industry and Information Technology innovation projects, Shandong Provincial key projects, and Heze City innovation and excellence projects. We have accumulated a total of 27 authorized utility models, 16 authorized inventions, participated in drafting 2 standards, 2 industry standards, and registered 15 trademarks. Our technical team, in collaboration with Professor Yajiang Li of Shandong University, has developed deep cryogenic container processing technology using the international plasma arc + wire filling tungsten inert gas arc welding (PAW-GTAW) technique. This technology has been appraised as reaching international standards in the field of deep cryogenic container manufacturing at the provincial level. Choose Zhongjie Special Equipment, and let's create brilliance together!