Jul. 28, 2025
What is a dewar?
A dewar is a double walled vacuum jacketed container, used to keep cryogenic liquids well insulated, preventing them from boiling to a gaseous state. The term can get confusing because technically any vacuum insulated container can be called a dewar, from small open mouth flasks, to large pressurized cylinders.
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What terms can I use to differentiate the dewars out there?
The best way to differentiate between dewars are by their function. An enclosed dewar whose purpose is to store and dispense liquefied gases (LN2, LOX, LH2, etc.) at pressure, would be a pressurized LN2 cylinder. A smaller open mouth flask meant for storing or transfering liquid nitrogen at atmospheric pressure, would be an open mouth LN2 dewar. A dewar that hold biological samples at cryogenic temperatures, would be a sample storage dewar, or a sample storage freezer for a larger automated unit.
Examples of each variety of sample storage:
How can I transfer liquid nitrogen from a pressurized liquid cylinder to another container?
First, you should only attempt to extract liquid from a low pressure (22 psi) liquid cylinder. Higher pressure cylinders are usually reserved for gas use. Next, you must use a cryogenic rated transfer hose. A standard hose has no insulation and will get very cold during use. A vacuum jacketed hose has great insulation and will only get cold at the end fittings, also preserving as much LN2 as possible during transfer. Both hoses are made from 304 or 316 SS. Last, the final connection is either direct to a freezer via its flare fitting, or a phase separator can be added to the end of the hose for easier open dewar filling.
See Hoses, Phase Separators
Does any equipment come with liquid nitrogen?
No, all liquid nitrogen must be sourced locally, as transporting LN2 is highly regulated.
Where can I buy liquid nitrogen for our equipment?
Liquefied gasses such as liquid nitrogen, argon, helium, oxygen, and others can be purchased from local welding supply shops, or by national molecule distributors such as Airgas or Praxair. Depending on your area, Princeton CryoTech may have a local recommendation.
Does an NER Certiicate (PN ) come standard with Vapor Shippers?
The NER Certificate is only available at the time the Vapor Shipper order is placed. Unfortunately, it cannot be ordered after the Vapor Shippers have been built and shipped. The document is serial number specific and will have to be requested at the time the order is entered. Contact or 800.232. for pricing and more information.
Goto SERLNG to know more.
Which cryogenic vapor shipper models (dry shipper) can store samples in liquid nitrogen upon arrival?
All models can be used to store samples in liquid nitrogen upon arrival at their destination, however, the following products have been specifically designed for this dual purpose.
Liquefied Natural Gas (LNG) cylinder, is a high-quality and reliable solution for the storage and transportation of LNG. AUYAN cylinder has been designed with safety and efficiency in mind and has been extensively tested to ensure that it meets the highest standards of performance and durability.
The LNG cylinder is constructed using advanced materials that provide exceptional strength and resistance to corrosion and wear. The cylinder is equipped with a state-of-the-art valve system that ensures precise control over the flow of LNG and provides excellent leak protection. The cylinder is also equipped with safety features such as pressure relief valves, safety burst discs, and a pressure gauge, to ensure that it can be used safely and with confidence.
Advantages of LNG Gas Cylinder
1. Long-term heat preservation: high vacuum degree, low exhaust frequency, two years vacuum guarantee, better than competitors.
2. High Safety: There is no leakage while using. It is not dangerous when being baked in the fire for 40 mins, dropping down from 10 m height, hit by 100 km/h. The gas cylinder frame fit the special installation requirements of the LNG automobiles and adapt to any complex conditions.
3. High stability: The gas cylinder output pressure in the gas supply system and matching degree of the valves is more stable.
Contact us to discuss your requirements of Horizontal Liquid Dewar Cylinder. Our experienced sales team can help you identify the options that best suit your needs.
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