499L Industrial Liquid Oxygen Dewar Flask Cryogenic Storage Vessel for Hospital & Manufacturing Plants

Products Description

499L Cryogenic Dewar Flask (Cryogenic Dewar/Liquid Nitrogen Tank) is a high-capacity, high-vacuum multi-layer insulated cryogenic liquid storage and transportation container designed for liquid nitrogen (LN ₂), liquid oxygen (LOX), liquid argon (LAr), liquefied natural gas (LNG) and liquid carbon dioxide (LCO ₂) for industrial-grade storage and road transportation. This product adopts double-layer stainless steel structure, interlayer vacuum and winding multi-layer thermal insulation material, the daily evaporation rate is as low as ≤ 1.7%, and it can maintain the low temperature of liquid nitrogen for several weeks in a full liquid state. It is a choice for biological sample banks, hospitals, scientific research institutions and industrial gas suppliers to achieve safe storage and efficient transfer of large-scale cryogenic liquids.

Product Specification

Specifications	Product model
	DPL650-499-1.44	DPL650-499-2.5
volume(L)	499	499
Effective volume(L)	449	449
Size(mm)	2045×770×1030	2045×770×1030
Working Pressure(MPa)	1.44	2.5
Set pressure of main safety value(MPa)	1.72	2.76
Set pressure of bursting discset(MPa)	2.41	4.14
Evaporation rate (Liquid nitrogen)	≤1.7%	≤1.7%
Empty weight(kg)	338	402
Maximum filling weight:Liquid oxygen(kg)	511	511
Maximum filling weight:Liquid nitrogen(kg)	364	364
Maximum filling weight:Liquid argon(kg)	629	629
Maximum filling weight:LNG(kg)	191	---
Maximum filling weight:LCO2(kg)	---	487
Level gauge	Capacitance
The base style	Frame style

more details

dewar vessel

Product Features

✔ Vacuum insulation, long cold retention & low cryogenic liquid loss

✔ Reinforced anti-collision frame, easy for forklift & trailer transport

✔ Complete safety valve set, simple operation

✔ Hydrostatic + helium leak test for every unit, stable quality

✔ Modular valve manifold, easy maintenance & spare parts replacement

✔ OEM logo available for distributor private brand sales

Product Advantages

1.Mature vacuum insulation technology, lower daily boil-off than standard competitors, longer storage period.

2.Cryogenic grade 304 inner tank, anti-low temperature brittle fracture & fatigue resistance.

3.Well-known brand safety valves, stable performance & spare parts available globally.

4.Full traceability for pressure vessel, unique stamp number for each unit, complete inspection documents.

5.Integrated horizontal frame design, easy for forklift, hoisting & trailer transport.

Application & Operation Notes

dewar cylinder price

Industrial gas station, laser cutting, metal welding & heat treatment, food quick-freezing, biomedical cryopreservation, ship supporting, mining, semiconductor cooling, laboratory, chemical cryogenic reaction, cold chain project.

Notes

1.Operators must receive professional training. Wear cryo-gloves & goggles to avoid frostbite.

2.Never overfill 499L cryogenic dewar flask. Filling volume shall not exceed rated capacity.

3.Keep well ventilated, far from fire & heat source. Do not vent large amount cryogenic gas in closed room.

4.Regular inspection for safety valve, burst disc and pressure gauge, periodic calibration per pressure vessel regulation.

5.Avoid tank impact & drop. Secure firmly during transport, prevent violent vibration.

6.Stop operation and contact manufacturer if abnormal frosting or continuous fast pressure rise.

Packing & Shipping

dewar bottle

dewar tank

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.Fasten steel belt on frame only, do not strap tank body directly.

2.Keep tank horizontal, tilting & inversion forbidden.

3.Shock-absorbing truck for long overland shipment to reduce vibration.

4.Wood stopper inside container to avoid sliding & collision during sea freight.

5.Documents attached: packing list, COA, pressure vessel certificate, inspection report.

Frequently Asked Problems and Solutions about cryogenic dewar

Frequently Asked Questions	probable cause	Solution
The evaporation rate is obviously increased	Decreased vacuum, damaged shell, failure of insulation	Check the shell for sunken; Contact manufacturer for vacuum inspection and repair
relief valve take-off	Overfilling, low pressure setting, high temperature	Excess liquid to less than 90%; Check the setting value of the safety valve; Move to shade
Iced valve unoperable	Atmospheric moisture condenses on cryogenic valves	Pour with warm water (not exceeding 40 °C) to thaw, and knock is strictly prohibited; Valve area dry during operation
Large area frosting of shell	Vacuum loss, liner leakage	Immediately deactivate, transfer media; Contact manufacturer for maintenance
Incorrect reading of liquid level gauge	buoyant lever stuck or damaged	Check whether the floating rod is stuck by ice, it is still abnormal after thawing, and the liquid level gauge needs to be replaced
No reading of pressure gauge	Gauge valve not open, pressure gauge damaged	Open the meter valve; Replace pressure gauge if still no reading

Why Choose us?

dewar factory

dewar company

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.

After Sales Service

1.Warranty: 12 months whole unit warranty from shipment date. Free repair & spare parts for non-human quality defects. Consumables like gaskets excluded.

2.Remote support: 7×16h online service, video guide for installation, commissioning & troubleshooting.

3.Spare parts: Valves, pressure gauges, safety relief parts always in stock.

4.Technical documents: Electronic operation manual, maintenance manual & drawings available permanently.

5.Onsite overseas service: Engineer overseas service available, customer covers travel cost.

6.Customer follow-up: Regular follow-up after delivery, monitor running status of 499L cryogenic dewar flask and send maintenance reminder.

Customer Visit

1010

Global customers are welcome to visit our factory and inspect 499L cryogenic dewar flask production line. Book appointment in advance: raw material inspection, auto welding workshop, NDT, hydrostatic test & finished product area. Live sample demonstration & face-to-face technical discussion. Hotel booking & pick-up service available.