New Arrival 499L Liquid Oxygen Dewar Flask Cryogenic LO2 Tank for Welding and Medical Gas Industry

499L Cryogenic Dewar Flask (VGL Welded Insulated Cryogenic Cylinder) adopts double-layer stainless steel & high vacuum multi-layer insulation. It is designed for storage & transportation of cryogenic liquids: LOX, LIN, LAr, LCO2. It supports road transport and on-site continuous gas supply. Manufactured per pressure vessel standards, low static boil-off rate, equipped with safety relief valve, liquid level gauge, inlet & outlet valve manifold. Widely used in gas stations, laser cutting, chemical, shipbuilding. Custom working pressure, valve assembly & connection ports available.

✅Fully welded stainless steel structure: the liner is made of SS304/SA240 stainless steel, and the shell is made of Q345R or SS304. The full welding process ensures structural integrity and air tightness under cryogenic conditions.

✅ Built-in vaporizer: Some models are equipped with built-in vaporizer, which can automatically provide a stable 10 Nm ³/h gas output, and directly use the gas terminal demand without external vaporization equipment.

✅ Multiple safety protection: Equipped with double pressure relief devices of safety valves and tablets to prevent the risk of overpressure. The set pressure of the safety valve matches the working pressure to ensure reliable discharge in case of abnormal pressure increase.

✅ CGA standard interface: It adopts international CGA standard connectors, compatible with mainstream gas pipelines and pressure reducing valve systems, and is convenient for global installation and maintenance.

✅ Optional level gauge and pressure gauge: The floating rod level gauge visually displays the remaining liquid volume, and the pressure gauge monitors the pressure status in the tank in real time.

1.Large-capacity and high-efficiency storage: The geometric volume of 499L is at the upper limit of the mainstream among similar products. A single tank can store about 364 kg of liquid nitrogen, and the manpower and logistics costs of fluid replacement.

2.Low evaporation rate: The evaporation rate ≤ 1.7%/d is significantly better than the industry average level of 2.0%-2.1%, and the annual saving of liquid nitrogen cost can reach more than 15%.

3.Long vacuum life: adopts high-precision vacuum sealing process and high-quality adsorbent, the vacuum life is much higher than that of ordinary products, and with a 3-year vacuum warranty, the total cost of ownership is lower.

Notes

1.Ventilation requirements: The evaporated volume of liquid nitrogen is about 700 times, and it must be used and stored in a well-ventilated area to avoid oxygen deprivation caused by nitrogen accumulation. Oxygen concentration monitors should be installed in confined spaces.

2.Personal protection: Low temperature protective gloves (not ordinary labor gloves), goggles or masks, and closed shoes must be worn during operation. Cryogenic liquids or cold metal surfaces on the skin can cause severe frostbite in seconds.

3.Sealing is strictly prohibited: The pressure relief channel of the Dui-vai tank must be unblocked, and it is strictly forbidden to replace the safety valve or piece with a sealing cover. If the pressure generated by the evaporation of liquid nitrogen cannot be released, the container will burst.

4.Check before filling: Confirm that the safety valve, sheet, and pressure gauge are in normal condition, and the filling volume does not exceed 90% of the effective volume, leaving gas phase space. Gravimetric filling is recommended.

5.Regular maintenance: Regular inspection of the shell whether there is abnormal frosting and whether the vacuum degree has dropped. If you find that the shell is frosted in a large area or the evaporation rate suddenly rises, you should stop using it immediately and transfer the medium, and contact the manufacturer for maintenance.

Packing: Whole tank wrapped by PE protective film; valve manifold fitted with dust cap. Frame reinforced with steel belt & solid wood block, corner protector for edge. FCL nude packing or fumigated wooden case optional for export.

Notes:

1.Transportation status: 499L Duvite tanks are recommended to be transported in empty tanks or under micro-positive pressure nitrogen protection.

2.Fixation and anti-dumping: The tank body must be fixed in the pallet or container, and straps should be used to prevent displacement or dumping on the way. Crowning transport is strictly prohibited (unless the design permits horizontal storage).

3.Avoid impact: The vacuum interlayer is the most fragile part of the container, and impact and drop should be avoided during transportation. Enclosure depressions may damage the vacuum seal, causing a sudden increase in evaporation rates.

4.Stay away from heat sources: Avoid prolonged exposure to the sun or close to high temperature areas during transportation, and control the temperature below 50 °C.

5.Loading and unloading requirements: Forklifts or hoisting equipment are used, and manual handling is strictly prohibited. Use special lifting lugs for tank body when lifting (if configured).

When choosing a 499L low-temperature Dovite tank, it is recommended to evaluate from the following five dimensions:

① Media type: Confirm whether the storage medium is liquid nitrogen, liquid oxygen, liquid argon or LNG. Different media have slightly different requirements for material compatibility and safety accessories. The 499L model is generally compatible with a wide range of cryogenic liquids, but LNG applications require confirmation of pressure classes and valve configurations.

② Working pressure: choose according to the pressure demand of downstream gas equipment. 1.44 MPa is suitable for conventional liquid nitrogen storage and low pressure gas supply; 2.5 MPa and above are suitable for industrial scenarios requiring higher output pressure.

③ Evaporation rate requirements: If the storage period is long and fluid rehydration is inconvenient, the model with a lower evaporation rate should be given priority (≤ 1. 7%/d is an excellent level). Vacuum is the core determinant of evaporation rate, and it is very important to choose a manufacturer with vacuum warranty commitment.

④ Transportation: 499L Duva tank with a full liquid weight of more than 700 kg needs to be equipped with forklift holes, lifting rings or special transportation brackets. If transported by road, it is to be confirmed that the vessel has passed the shock vibration test.

⑤ Certification and market access: CE/PED is required for export to the EU, EAC is required for export to Russia, and ASME is recommended for export to North America. Acknowledging certification coverage in advance avoids barriers to customs clearance.

1.Direct manufacturer, no middleman, OEM/ODM & custom logo available.

2.Own pressure vessel workshop, CNC welding & NDT lab

3.Pre-sales: free solution design, flow calculation, 3D drawing support.

4.In-production: production photos, pre-shipment inspection video, third-party witness inspection.

5.After-sales: global online technical support, fast spare parts supply, 1-year warranty.

6.Full customs clearance documents: CE, ISO, pressure vessel certificate, material & NDT reports.

1.Vacuum warranty: within 1 year from the date of delivery, if the vacuum degree decreases due to manufacturing reasons, and the evaporation rate exceeds the specification value, the vacuum system will be repaired or replaced free of charge after testing and confirmation.

2.Accessories supply: Safety valves, tablets, liquid level gauges, pressure gauges and other vulnerable parts supply, issued within 48 hours after placing an order.

3.Technical support: Provide installation guidance, operation training videos, and remote fault diagnosis. Complex problems can be arranged by engineer video connection or on-site support (depending on the region).

4.Response timeliness: respond within 24 hours for after-sales consultation, and issue solutions for technical problems within 48 hours.

5.Standby machine service: Cooperative customers can apply for standby machine turnover service to ensure uninterrupted business.

We welcome customers from all over the world to visit our factory, and we can arrange the following visits:

1.On-the-spot inspection of the production line: observation of the whole process from coiling to vacuum treatment

2.Field Demonstration of Vacuum Detection and Pressure Test

3.Technical Exchange Meeting: Selection Suggestions for Customer-specific Application Scenarios

4.Visit to the sample exhibition hall: physical display of multi-specification Duo-tile tanks and storage tanks

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