With Cryomed cryosaunas, you have two options for liquid nitrogen storage and feed ' non-pressurized Dewar containers or larger pressurized cryogenic tanks. In most cases, they are not interchangeable. Therefore, before buying a cryosauna, it is crucial to choose the type most suitable for your needs.
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A cryo Dewar is a two-walled vacuum flask capable of keeping a relatively constant temperature of a cryogenic liquid over a long period. Design-wise, Dewars are big thermos bottles with loose-fitting caps.
Cryogenic Dewars are a good fit for cryotherapy centers with low to moderate customer flow. As a rule, Cryomed's open-top cryosaunas come with two 35-liter non-pressurized tanks or, optionally, with two 50-liter tanks. If you expect more than ten cryo-goers daily, you might want to opt for pressurized cryogenic liquid cylinders.
Cryosauna Cryomed Pro (Dewar type)A liquid nitrogen cylinder is a pressurized vacuum-jacketed tank. It features valves for refilling and withdrawing liquid nitrogen, a pressure release valve and a pressure indicator for safety. In addition, a cylinder is fitted with a float level gauge to control the liquid nitrogen consumption.
Though both tanks serve the same purpose, non-pressurized Dewars and pressurized liquid nitrogen cylinders differ from each other in:
Non-pressurized Dewar tanks are smaller and easier to handle. In Cryomed Pro or Cryomed Basic, a cryo Dewar is rolled into the cryosauna. In smaller models, like Cryomed One or Cryomed Mini, a Dewar sits next to the device. When not in use, Dewars can be stored in a utility room.
A pressurized cryo cylinder always stays outside a cryosauna. In smaller premises, a tank can sit in another room or even outside the building. The cryotherapy machine and the tank are linked by a standard two-meter cryogenic hose. However, Cryomed's team can always find a suitable solution for your location, so feel free to reach out.
A 35-liter Dewar container weighs 17 kg when empty and comes with a wheeled platform, making it easy to move. In some countries, you can put it in your car and get it refilled at your supplier's. However, in the majority of cases, such tanks get refilled at your place from a specialized truck.
Pressurized tanks are heavier and more large-sized. They are always refilled or replaced with a full tank at your place. Make sure to consult your supplier about any restrictions linked to your location in advance. If your business is on the 3rd floor in an old high-rise building without a heavy-duty elevator, Dewars may be a safer bet.
Pressurized tanks have a higher evaporation rate than non-pressurized cryo Dewars. In addition, nitrogen gets lost along the hose and on the junctions between the valve and the hose and between the tank and the hose. However, with a high customer flow, this loss is negligible.
For reference, pressurized tanks evaporate 2 to 5% of their capacity, depending on the manufacturer. Non-pressurized Dewars used by Cryomed evaporate 0.5% of their capacity.
Usually, manufacturers estimate the evaporation rate conservatively. The most reliable way to assess holding time is to track actual daily weight changes. Used cryo tanks have a higher evaporation rate.
Liquid nitrogen cylinders are expensive. Their price tag can easily reach up to several thousand euros, depending on their capacity and manufacturer. That's why many cryopreneurs prefer renting cryo cylinders from local nitrogen suppliers.
A Dewar costs between 1,000 EUR and 1,500 EUR. Depending on your customer flow and nitrogen supply terms, you might need to buy more Dewars in addition to the two tanks you get together with a cryosauna.
As nitrogen consumption affects the number of sessions you can get out of your cryogenic container and, eventually, the session cost, there are a couple of things to bear in mind.
Consumption of liquid nitrogen in cryogenic tanks depends on:
You can save nitrogen by scheduling sessions one by one with no more than 10-minute gaps in between.
That is why the number of sessions you can get from one cryogenic container is tentative.
Standard non-pressurized Dewar tanks have a 35-liter capacity, sufficient for one cooling and up to 8 treatment sessions. It is a good choice if you expect up to ten customers per day or buy a cryosauna for home use.
Pressurized tanks vary in capacity from 100 to 5,000 liters, but the most usual option is 240 liters. Out of a 240-liter tank, you can have some 60 sessions.
A cryogenic liquid cylinder is a convenient and cost-effective option that does not require frequent refills. It is most suitable for businesses with high customer flow, like a gym, a spa, or a clinic.
Now that you are clued in on the two types of cryogenic vessels, let's see how to make the best choice.
Dewar vs pressurized tank ' which to choose?That's why it is crucial to find a local liquid nitrogen supplier and clarify their pricing and supply terms before you buy a cryosauna.
Both types of cryogenic containers have their pros and cons. Our sales department is always happy to make your choice easier based on our extensive experience. Give us a ring or drop us a message on !
Cryogenic liquids exist at extremely low temperatures which is why specialized equipment is required for their transportation and storage. Contrary to popular belief, it's not just possible to store cryogenic liquids in a standard container.
Doing so would make it impossible to handle them and would also present health and safety risks to those who work with them. Cryogenic tanks are built for this express purpose.
They're manufactured with durable materials that are able to withstand such low temperatures. Additional precautions are also built into the equipment so as to reduce any chances of leakage.
What is a cryogenic tank?
Cryogenic tanks are the containers that are used to store cryogenic liquids such as liquid nitrogen, helium, argon, etc. Cryogenic tanks are also utilized for storing gases like liquefied natural gas and nitrous oxide at higher temperatures.
It's vital for these tanks to be thermally insulated so as to maintain the low temperatures. This is achieved through the use of a vacuum jacket. It's vital that this component be designed and manufactured to a high specification that follows established international design codes.
Cryogenic tanks can be of several different kinds. Static or fixed tanks are those that are used in a fixed location, such as a cryogenic processing facility. Static tanks also include the small mobile tanks that are mounted on wheels for use in labs and workshops.
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These small cryogenic tanks are also known as pressure vessels. There are non-pressurised open neck vessels called Dewar flasks available as well for use in scenarios where direct access to the cryogenic liquid is required.
It's possible to repair cryogenic tanks but it's not a job that just about anyone can do. Any repairs or modifications to such tanks should be carried out by a skilled repairer who performs the job in line with the design codes to which the tank was manufactured.
They also need to be mindful of the prevailing regulations and legislation.
Any and all repairs or modifications carried out need to be documented so that records can be kept for as long as the tank is in service.
Where cryogenic tanks fit in the cryogenic treatment process
Cryogenic tanks are integral to the entire cryogenic treatment process. Without them, it would not be possible to transport and store cryogenic liquids. So it can be said that the cryogenic treatment process wouldn't be possible without these tanks.
Their efficacy isn't just limited to the storage and transport of the cryogenic materials. These tanks also play an important role in the deep cryogenic treatment process, where metals and plastics are kept submerged in the cryogenic liquids for up to 24 hours.
As previously discussed, it's not possible to do this with a conventional tank. There would be too many factors at play that would disrupt the treatment process. That's what makes cryogenic tanks so vital to the entire process. Without them, deep cryogenic treatment can't take place.
State of the industry: cryogenic tanks
There's a fair bit of legislation that governs the industry's use of cryogenic tanks. They have to be operated and maintained in a manner that's in compliance of these regulations.
Only designated competent persons are to maintain and manage the cryogenic tanks. The industry abides by these regulations. As such, static tanks are put through inspections at regular intervals. Routine maintenance and periodic formal examination is also carried out.
The maintenance and inspection regime has to be created so that it can be ensured that the tank is in a position to allow safe operation at all periods of time between the formal examinations.
Periodic inspection and testing is also required for transportable tanks and this can only be performed by an inspection body. These inspections and examinations have to be documented and the records have to be retained for the life of the tank.
There's a duty of care that the industry needs to abide by when they own or use cryogenic tanks. Responsible gas suppliers will only fill a cryogenic tank once they're satisfied that it's safe to do so.
Major cryogenic tank manufacturers
Lapesa
is a leading manufacturer of pressure vessels. This family enterprise was founded in and it manufactures cryogenic gas storage tanks, storage tanks for liquid fuels, and more. The company's production facilities are located in Zaragoza, Spain.
Its cryogenic tanks have two vessels, one inside the other, with thermal insulation in the chamber between them.The heat insulation is provided with an insulating material and a high vacuum that fills the chamber in between the two vessels. Greater vacuum stability is provided by absorbent material.Lapesa designs its cryogenic tanks for different working pressures from 5 ' 42 bar. They're certified according to European Directive /68/EU on Pressurised Equipment.
What cryogenic tanks does CTP Cryogenics use?
Controlled Thermal Processing Cryogenics manufactures and sells state-of-the-art cryogenic equipment to industry leaders across the globe. Our vacuum insulated equipment is rugged and efficient, thereby lowering materials operating costs for our customers.
The cryogenic equipment that we manufacture is suitable for any cryogenic processing application.
Our machines have an internal heat exchanger in a vacuum insulated Dewar to provide customers with more control to achieve a consistent output. There are three different sizes on offer so you can choose the right tool for the job at hand.
Our innovative design enables our cryogenic tempering equipment to boast the lowest use of liquid nitrogen of any available machine on the market. The permanent vacuum insulation does its job reliably and efficiently since there's no compressor pump to fail or material to degrade.
The patented heat exchanger used in these machines relies on a completely dry process so no spray bars are required to spray liquid nitrogen on the payload. The integrated heating element also allows for tempering within the machine itself.
All of our machines come with a one-year warranty, during that period the manufacturer will supply any replacement parts needed to fix any defects in workmanship or materials at no cost to the customer.
Get in touch with CTP Cryogenics today for a quote.
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