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Large-Capacity 500L Dewar Flask

As a low-temperature thermal insulating pressure vessel, welded insulating gas cylinders are mainly used to store and transport liquid oxygen, liquid nitrogen, liquid argon, liquid carbon dioxide, liquefied natural gas, and can automatically provide gas continuously. The gas cylinder is designed as a double-layer (vacuum) stainless steel structure, and the inner tank is used to store low-temperature liquid. Its outer wall is wrapped with multi-layer thermal insulation materials, which has super thermal insulation performance. At the same time, the sandwich layer (the space between the two layers of containers) is pumped into a high vacuum, which together forms a good thermal insulation system.

If the gas flow rate is larger, connect several gas cylinders in parallel to a main pipeline or connect an external vaporizer to solve the problem, so as to avoid insufficient gas supply and damage to gas cylinder parts.

Model:
DPL450-500

Size:	DPL650-500-1.6MPA DPL650-500-2.5MPA DPL650-500-3.45MPA
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Product Description

| Product Overview

The 500L Dewar Flask is a premium low-temperature thermal insulating pressure vessel engineered for the reliable storage and transportation of cryogenic liquids including liquid oxygen (LO2), liquid nitrogen (LN2), liquid argon (LAr), liquid carbon dioxide (LCO2), and liquefied natural gas (LNG). Featuring a double-layer vacuum stainless steel structure, the inner tank securely holds cryogenic liquids while the outer wall is wrapped in multi-layer thermal insulation materials. The high-vacuum sandwich layer between the two containers forms an exceptional thermal insulation system, minimizing heat transfer and evaporation loss. With a geometric volume of 500L and effective volume of 450L, this robust vessel is designed to automatically supply gas continuously, making it suitable for high-demand scenarios. Available in multiple pressure ratings (1.6Mpa, 2.5Mpa, 3.45Mpa), the 500L Dewar Flask meets the needs of diverse industrial, scientific, and healthcare applications.

| Core Advantages

Superior Thermal Insulation Performance

Adopting advanced high-vacuum and multi-layer insulation technology, the 500L Dewar Flask achieves ultra-low heat transfer efficiency, reducing the evaporation rate of liquid nitrogen to just 1.70%. This ensures minimal loss of valuable cryogenic liquids, cutting operational costs significantly.

Extended Storage & Cost-Effectiveness

With its ultra-low daily evaporation rate, the flask enables long-term storage of cryogenic liquids without frequent refilling, ideal for remote locations or intermittent use. Despite a higher initial investment, the reduced refill frequency and lower liquid consumption result in long-term cost savings, offering excellent total cost of ownership.

Enhanced Safety & Reliability

Equipped with a sturdy outer casing, safety valves, and rupture discs (blasting pressure up to 5.17Mpa), the 500L Dewar Flask adheres to strict safety standards. High-quality manufacturing processes ensure safe operation during storage, transportation, and daily use, minimizing risks of accidents.

User-Friendly Design & Durability

Built with portability in mind, many models include wheels and handles for easy maneuvering. Constructed from high-grade stainless steel, the flask withstands harsh industrial environments and physical impacts, boasting a long service life. Its passive design (no power required) and simple structure allow for minimal daily maintenance.

High Purity Preservation

A premium sealing system and dedicated stainless steel inner vessel prevent external contaminants from entering, maintaining the purity of stored media such as high-purity LN2 and LAr. This makes it ideal for applications requiring uncompromised liquid quality.

| Application Fields

Scientific Research & Laboratories

Cryogenic Sample Storage: Preserves biological samples (cells, strains, tissues), blood, and vaccines via liquid nitrogen vapor or liquid phase storage.

Superconductivity Experiments: Provides critical cryogenic environments for superconducting magnets in NMR and MRI systems, as well as particle detectors.

Material Processing: Enables cryogenic treatment of metals and plastics to enhance wear resistance, and supports cryogenic grinding operations.

Detector Cooling: Cools semiconductor detectors in electron microscopes (SEM, TEM) and spectrometers, improving sensitivity and signal-to-noise ratio.

Industry & Manufacturing

Metalworking & Welding: Stores liquid oxygen and argon for metal cutting, welding, and as shielding gases; liquid nitrogen serves as an assist gas for laser cutting.

Chemical & Refining: Acts as an inert shielding gas for purging and blanketing, preventing oxidation in chemical processes; suitable for LNG storage and transport.

Cryogenic Grinding: Embrittles hard-to-grind materials (rubber, plastics, spices) at low temperatures, facilitating efficient pulverization.

Shrink-Fit Assembly: Contracts metal parts for easy insertion, achieving secure interference fits in precision machinery.

Healthcare & Biotechnology

Reproductive Medicine: Enables long-term cryopreservation of sperm, eggs, and embryos, supporting IVF and gene bank operations.

Organ Preservation: Facilitates cryogenic transport and storage of transplant organs, skin, and bone tissues.

Cryosurgery: Stores liquid nitrogen for treating warts and early-stage skin cancers by destroying abnormal tissue with extreme cold.

Medical Equipment Cooling: Provides continuous cooling for MRI scanners and other specialized medical devices.

Food & Beverage Industry

Flash Freezing: Uses liquid nitrogen for rapid food freezing, preserving texture and nutrients; ideal for refrigerated transport.

Beverage Processing: Supplies long-lasting cooling for beer and beverages in bars/restaurants; used in making liquid nitrogen ice cream and molecular gastronomy creations.

Wine Chilling: Features stylish decanter-shaped designs for quick cooling of wine to optimal serving temperatures.

500L Dewar Flask

Product Model		DPW650-450-1.6	DPW650-500-1.6	DPW650-450-2.5	DPW650-500-2.5	DPW650-450-3.45	DPW650-500-3.45
Dimensions (Length x Width x Height)mm		2000x820x1062	2000x820x1062	2000x820x1062	2000x820x1062	2000x820x1062	2000x820x1062
Work Pressure(Mpa)		1.6	1.6	2.5	2.5	3.45	3.45
Safety Valve Popping Pressure(Mpa)		1.9	1.9	3	3	4.1	4.1
Blasting Pressure Of Bursting Disc(Mpa)		2.61	2.61	3.62	3.62	5.17	5.17
Geometric Volume(L)		450	500	450	500	450	500
Effective Volume(L)		405	450	405	450	405	450
Evaporation Rate (liquid Nitrogen)		1.80%	1.70%	1.80%	1.70%	1.80%	1.70%
Empty Bottle Weight(Kg)		321	342	418	445	470	502
Maximum Filling Capacity	Oxygen(Kg)	442	487	442	487	442	487
	Nitrogen(Kg)	311	346	311	346	311	346
	Argon(Kg)	535	602	535	602	535	602
	Carbon Dioxide(Kg)	——	——	452	503	452	503
	Nitrous Oxide(Kg)	——	——	420	442	420	442
	Natural Gas(Kg)	170	190	——	——	——	——

| Operation & Safety Guidelines

Safe Operation Practices

Always wear antifreeze gloves and goggles to prevent frostbite from direct contact with low-temperature liquids or metal surfaces.

Operate in well-ventilated areas to avoid oxygen displacement and suffocation risks from evaporated nitrogen.

For high gas flow requirements, connect multiple flasks in parallel to a main pipeline or use an external vaporizer to prevent insufficient supply and component damage.

Handling & Transportation

Short-distance movement: Use a special trolley and ensure the flask is securely fixed.

Maintain upright position at all times; never dump, roll, or lay the flask horizontally.

Stair transportation: Require two personnel and use a dedicated carrying rack or trolley—never carry alone.

Daily Maintenance

Keep the outer wall clean to prevent dust from blocking exhaust pores.

Regularly check for abnormal large-area frosting, which indicates vacuum failure; stop use and contact the supplier immediately if detected.

Keep the bottle cap closed even when empty to prevent impurities and moisture buildup, avoiding internal freezing.

Store in a non-corrosive environment to protect the stainless steel structure.

| Production Process

The 500L Dewar Flask undergoes a rigorous manufacturing process to ensure quality and performance:

Material Selection: High-grade stainless steel is chosen for the inner and outer tanks, ensuring corrosion resistance and structural integrity.

Precision Welding: Automated welding technology is used to assemble the double-layer structure, ensuring airtightness and strength.

Multi-Layer Insulation Application: The outer wall is wrapped with 25+ layers of thermal insulation materials to enhance heat resistance.

Vacuum Pumping: The sandwich layer is pumped to a high vacuum state using professional equipment, eliminating heat transfer via conduction and convection.

Component Installation: Safety valves, pressure gauges, rupture discs, and filling/withdrawal valves are installed and calibrated to meet safety standards.

Quality Testing: Each flask undergoes pressure testing, vacuum testing, and leakage testing to ensure compliance with industry regulations.

Finishing: The outer surface is polished and coated for corrosion resistance, followed by final inspection before packaging.

500L Dewar Flask

| FAQ

What are the main hazards of operating a 500L Dewar Flask? How to prevent them?

The primary hazards are frostbite and suffocation. Prevent frostbite by wearing protective gloves and goggles. Avoid suffocation by operating in well-ventilated spaces, as evaporated nitrogen can displace oxygen in enclosed areas.

Is there a risk of explosion with the 500L Dewar Flask?

When used and maintained properly, the flask is extremely safe. It is equipped with pressure relief devices (safety valves, rupture discs) that prevent overpressure, eliminating explosion risks under normal conditions.

Is frosting on the outer wall normal?

Slight frosting near the neck tube or bottom for newly filled flasks or in high-humidity environments is normal. However, thick, uniform frosting across the entire bottle (especially the upper half) indicates vacuum failure—stop use and contact the supplier immediately.

What is the maximum filling capacity for different liquids?

The maximum filling capacity varies by liquid: oxygen (487kg), nitrogen (346kg), argon (602kg), carbon dioxide (503kg), nitrous oxide (442kg), and natural gas (190kg).

| Call to Action

Ready to elevate your cryogenic storage and transport capabilities with the high-performance 500L Dewar Flask? With its superior insulation, long-term storage capacity, and versatile applications, this vessel is the ideal solution for scientific research, industry, healthcare, and food processing. Contact us today to inquire about pricing, technical specifications, or customization options. Click "Add to Basket" to secure your order—with 1000 units in stock, we ensure fast delivery to meet your urgent needs. Invest in reliability, safety, and cost-effectiveness—choose the 500L Dewar Flask for your cryogenic liquid management requirements!

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