#dewar tank

[china-cryogenic-tanks]

Cryogenic dewar flasks are typically constructed with a double-walled design, with a vacuum-sealedspace between the inner and outer walls. This vacuum acts as a thermal barrier, preventing heat fromentering the flask and maintaining the low temperature inside. The inner wall is usually made of stainlesssteel or other materials with high thermal conductivity, while the outer wall provides structural supportand additional insulation. The space between the fences is often evacuated to further reduce heattransfer through conduction and convection. Additionally, some dewar flasks incorporate reflectivecoatings on the inner surface to minimize radiant heat transfer. The YDS liquid nitrogen cylinder is used in various industries such as biotechnology, healthcare, and research. It contains liquid nitrogen, which is a commonly used cryogenic fluid. Its main purpose is to store and transport biological samples, cells, tissues, and other materials at ultra-low temperatures to ensure their long-term preservation and quality during storage and transportation.

[qianjunwang]

Factors to Consider When Choosing Dewars and Cryogenic Vessels

When selecting Dewars and cryogenic vessels for your business needs, it's important to consider several factors to ensure that you choose the right equipment. Here are some key factors to keep in mind:

Purpose and Application: Determine the specific purpose and application of the vessels you need. Consider the type of materials you will be storing or transporting, their temperature requirements, and any specific handling or safety considerations.

Capacity and Size: Assess your storage or transportation needs in terms of capacity and size. Consider the volume of materials you need to store or transport and choose vessels that can accommodate your requirements. Keep in mind that larger vessels may offer more storage capacity but may also be more challenging to handle and transport.

Material and Construction: Pay attention to the material and construction of the Dewars and cryogenic vessels. Stainless steel and aluminum are commonly used materials as they offer durability and resistance to low temperatures. Glass vessels may be suitable for certain applications but can be more fragile. Choose vessels that are designed to withstand the temperatures and conditions specific to your application.

Insulation: Consider the insulation capabilities of the vessels. Effective insulation is crucial for maintaining the low temperatures required for cryogenic storage. Look for vessels with high-quality insulation materials and designs that minimize heat transfer and provide efficient temperature control.

Safety Features: Ensure that the vessels you choose have appropriate safety features. This may include pressure relief valves, emergency venting systems, and secure closures to prevent leaks or spills. Safety should be a top priority when dealing with cryogenic materials.

Supplier Reputation and Support: Research and choose reputable suppliers or manufacturers with experience in producing high-quality Dewars and cryogenic vessels. Consider factors such as product warranties, technical support, and after-sales service. A reliable supplier will be able to provide guidance and assistance throughout the lifespan of the equipment.

Compliance with Regulations: Verify that the Dewars and cryogenic vessels you choose comply with relevant regulations and standards in your industry. This ensures that the equipment meets safety and performance requirements and can be used legally and responsibly.

Conclusion

Choosing the right Dewars and cryogenic vessels is essential for businesses that require storage or transportation of materials at extremely low temperatures. By considering factors such as purpose, capacity, materials, insulation, safety features, supplier reputation, and compliance with regulations, you can make an informed decision that suits your business needs.

It's recommended to consult with industry experts or suppliers who specialize in cryogenic equipment to get personalized recommendations based on your specific requirements. They can provide valuable insights and guidance to help you choose the most suitable Dewars and cryogenic vessels for your business.

[inoxcva]

Dewars Decoded! From the science behind them to their indispensable nature to many industries. Explore the vast world of liquid nitrogen dewars.

[williamjone]

Cryogenic Storage Tanks manufacturer

DSW mainly manufactures cryogenic Transport trailers with various pump and drive options, and the cryogenic semi-trailer is ASTM certified or other international standards. They are most commonly used to transport Oxygen, Nitrogen, and Argon and are built for maximum payload, safety, economy, and longevity. WHY DSW? DSW INTERNATIONAL has been listed by the General Administration of Customs of China beginning in 2019 to provide accurate "China data" for their National Export Indicator Survey.

[usafphantom2]

WHY DID THE SR-71 REFUEL AFTER TAKE OFF?

Shortly after takeoff, the SR 71 rendezvous with a specially modified KC-135Q tanker at 25,000ft and top up the jet’s tanks with specially developed JP-7 fuel. This purged the tanks of air, and as the fuel was burned the resulting void was filled with gaseous nitrogen (LN2) to prevent inadvertent fuel vapor ignition from the hot, wet tanks. This is the reason why there was a refueling so shortly after takeoff, it was not because of the leaking of the fuel. ( it did leak, but not that much) it was to prevent combustion of the fuel. A yo-yo flight was possible, but it was very difficult to purge all of the nitrogen out of the air, but they could do it.. To purge the air out of the SR 71 was imperative to its safety.

Here is a quote from SR 71 pilot Rich Graham he explains it best. The JP-7 fuel reaches temperatures well over 300 degrees F. during Mach 3 cruise. , making the fumes in each of the six fuel tanks very volatile and potentially explosive. The metal skin of the aircraft approaches 400 degrees F., adding to the volatility of the fuel inside the tanks. One of our aircraft limitations was a maximum speed of Mach 2.6 without an inert atmosphere inside the fuel tanks.

“The aircraft had three liquid nitrogen Dewar flasks containing 260 liters of liquid nitrogen, located in the nose wheel well. The only way to ensure 100 percent inert atmosphere in each fuel tank was to refuel the plane inflight completely full of JP-7, allowing ambient air in each fuel tank to vent overboard. Once full of fuel, gaseous nitrogen would now dominate each fuel tank’s empty space above as it burned off JP-7. The nitrogen gas pressurized each fuel tank to 1.5 psi above ambient pressure and inerts the space above the heated fuel to prevent autogenous ignition. This is why we refueled after takeoff."

"Then we could safely accelerate beyond Mach 2.6.” “There was one other way of achieving tank inerting, called a Yo-Yo. but this was a maintenance nightmare. A few of our missions required the SR-71 to accelerate to Mach 3+ right after takeoff with a 65,000-pound fuel load. The Yo-Yo procedure had the crew chief completely refuel the plane to full tanks of 80,000 pounds of fuel. Then, with the nitrogen pressurization system working, they de-fueled 15,000 pounds of JP-7, ending up with a 65,000 pound fuel load and a plane that was capable of going immediately to Mach 3+.”

~Linda Sheffield

@Habubrats71 via X

[chilope]

I posted 4,979 times in 2022

That's 2,463 more posts than 2021!

555 posts created (11%)

4,424 posts reblogged (89%)

Blogs I reblogged the most:

@triviallytrue

@sapphicdisclosures

@dingdongyouarewrong

@heat--end

@existentialvibeology

I tagged 1,400 of my posts in 2022

#yeah - 24 posts

#me - 22 posts

#neyenz - 13 posts

#:( - 11 posts

#:) - 10 posts

#sigh - 9 posts

#literally - 7 posts

#lol. lmao. - 6 posts

#god - 6 posts

#hmm - 5 posts

Longest Tag: 140 characters

#'no i can kiss girls because im so comfortable with my heterosexuality! thats why i joke about being in love with women! im just so straight

My Top Posts in 2022:

#5

when i first started following yorick i thought "its a little uncomfortable to insist that a man who identifies as straight is actually gay just because hes on tumblr" but i get it now

42 notes - Posted August 30, 2022

#4

yo whats yudkowskys deal tho

86 notes - Posted April 15, 2022

#3

she e on my e til i cummings

109 notes - Posted June 29, 2022

#2

a series of events

my experiment relies on the use of liquid nitrogen

we ran out of liquid nitrogen last week

we were supposed to get more delivered this morning

one of the delivery trucks left with all of the specialized tank dollies and would not be able to return until the end of the day

our delivery gets delayed until tomorrow

in order to not waste an entire day we decide to borrow some from an affiliated lab

on the way there it starts raining

we aquire the liquid nitrogen, stored in our small transport dewar

transport dewar is not pressurized, meaning the nitrogen gases off as it sits

nitrogen has no smell and is lethal if too much is inhaled so we store it in the trunk

we make it 95% of the way back to the lab before taking a turn a little too hard, causing the dewar to tip over and begin draining hard enough that we can hear it in the cabin

beloved coworker pulls over immediately so i can jump out and put it upright before we lose all of it or the trunk of her car freezes

she happened to have accidentally pulled into the entrance to the fire station

i jump out at max speed to minimize chances of getting hit by a fire truck

we are parked inside of a 2 inch deep puddle

i am wearing toms

i open the trunk

it is filled with nitrogen gas and extremely cold

the dewar fell onto the handle, meaning i had to grab the tank in order to right it

it is so cold i burn myself

we make it back to the lab without further incident

my shoes are soaking wet, but my boss always has 18 pairs of rubber sandals in his office so i figure ill just put on his sandals and put my shoes in the oven to dry

he took all of his sandals home on friday for some fucking reason

fuck it, ill just go barefoot and sit in the break room

put my shoes in the oven

wait 30 minutes

retrieve shoes

they are still soaking wet and now the oven smells like feet

154 notes - Posted August 1, 2022

My #1 post of 2022

she was a boy, he was a girl, can i make it any more obvious?

214 notes - Posted August 22, 2022

Get your Tumblr 2022 Year in Review →

[adchemgas]

Nitrogen for Sale: Unlocking the Power of Versatile Gas Solutions

In the realm of industrial gases, nitrogen stands out as one of the most essential and versatile elements. With its myriad applications across various industries, the demand for high-quality nitrogen is ever-present. For businesses and researchers alike, finding reliable sources for nitrogen for sale can be a game-changer, enabling them to harness the full potential of this indispensable gas.

Understanding Nitrogen and Its Applications

Nitrogen, a colorless, odorless, and inert gas, constitutes approximately 78% of the Earth's atmosphere. Its inert nature makes it highly valuable in a range of applications. In the industrial sector, nitrogen is primarily used as a protective gas in processes that require an oxygen-free environment. This includes the manufacturing of electronic components, where nitrogen helps prevent oxidation and ensures the longevity and reliability of sensitive electronics.

In the food and beverage industry, nitrogen plays a crucial role in preserving freshness. It is used in packaging to displace oxygen, thereby extending the shelf life of perishable items. The pharmaceutical industry also benefits from nitrogen's properties, utilizing it for cryopreservation of biological samples and in various production processes that require a controlled environment.

Additionally, nitrogen is employed in laboratories for a variety of purposes, including cooling, flushing, and as a carrier gas in analytical instruments. Its role in creating a safe, controlled atmosphere makes it indispensable for numerous scientific and industrial applications.

Choosing the Right Nitrogen Supplier

When sourcing nitrogen for sale, quality and reliability are paramount. A reputable supplier should offer high-purity nitrogen that meets industry standards. For applications requiring ultra-high purity, such as semiconductor manufacturing or specialized research, ensuring that the nitrogen meets these rigorous specifications is crucial.

Suppliers often provide nitrogen in different forms: as a gas, liquid, or in high-pressure cylinders. Liquid nitrogen is particularly useful for applications requiring extremely low temperatures, such as cryogenic preservation. On the other hand, compressed nitrogen gas is more suited for processes that involve a steady supply of nitrogen at ambient temperatures.

Factors to Consider When Buying Nitrogen

Purity Levels: Depending on your application, you may need nitrogen of varying purity levels. Ensure that the supplier can provide nitrogen that meets the specific purity requirements for your needs.

Delivery Options: Consider the delivery options offered by the supplier. Reliable delivery services are essential to ensure that your operations remain uninterrupted. Some suppliers offer bulk delivery services, while others provide smaller quantities in cylinders or dewars.

Storage Solutions: Proper storage of nitrogen is essential for maintaining its quality. If you are purchasing liquid nitrogen, you will need appropriate storage tanks. For gas, ensure that you have the necessary infrastructure to handle high-pressure cylinders safely.

Cost and Availability: While cost is a significant factor, it should be weighed against the quality and reliability of the supply. Establishing a long-term relationship with a trustworthy supplier can often lead to better pricing and service.

Conclusion

In conclusion, nitrogen is a vital gas with a wide range of applications across various industries. Finding a reliable source for nitrogen for sale can significantly impact the efficiency and effectiveness of your operations. By considering factors such as purity, delivery options, and cost, you can ensure that you are getting the best possible value for your investment. Whether you are in manufacturing, research, or any other field that relies on nitrogen, choosing the right supplier will enable you to leverage the full potential of this versatile gas and achieve your operational goals with confidence. For more details visit our website: www.adchemgas.com

[messier51]

wait the 180l dewars are not actually dewars?? they are supply tanks

[pattonsmedical-blog]

High Pressure and Liquid Medical Gas Manifold Installation

Discussing high pressure and liquid medical gas manifolds located indoors, the number one aspect is that it has to be a separate secured room with one hour fire rating used for no other purpose. Your manifold room can only have the manifolds and the container that is being replaced. You can store and keep connected what you’re actually using.

For example, if you have Dewars, you are only able to store Dewars, and then your high-pressure cylinders (H tanks) can go in there. Sometimes people put the vacuum pump and the oxygen manifold in the same room – that is not allowed and very expensive to change order. Remember, your manifolds must be in a room all by themselves and be properly labeled.

Although this blog discusses the most common practices, Pattons Medical advises you to always work with your local municipality and local verifier to ensure that your design complies with your interpretation of whichever code they’re working on. Additionally, please note that any electrical devices in this room must be situated above five feet, and relief valves must be installed with copper piping that extends outside the room. The discharge should be turned down and screened for safety. Another important consideration is having a source valve located near the manifold.

When it comes to the insulation of the room, there are several other factors to take into account. Firstly, the temperature inside the room should not exceed 125 degrees. Additionally, ventilation must be carefully planned and implemented to ensure optimal conditions. You are able to naturally ventilate the room if your total gas falls below 3000 cubic feet. You can access gas volume charts on the Pattons Medical website.

Reference NFPA 99 5.1.3.3.2 (1-9) for design and construction details for locations of central supply systems and storage of positive pressure gases.

Indoor rooms can be heated by indirect means using steam or hot water if needed. The common rule of thumb for your liquid containers, your Dewars, is depending on the gas, it could be between 12 and 16 H cylinders. You will know where you are in that 3000 cubic feet threshold by the math and whether you want to do the mechanical versus the natural.

[molsons112000]

Yes, you can put a bomb in a cryogenic chamber. So the chamber will keep the bomb permanently suspended.

You could also put it in liquid hydrogen or even colder liquid helium. It can be held in a cryogenic chamber. So it offers a permanent solution.

Would freezing a bomb work?

In chemical action fuses, chemical reactions will be prevented or slowed down. Now, here's the problem…even liquid nitrogen will eventually warm to ambient temperature. So freezing components isn't a permanent solution.Jul 6, 2017

https://www.quora.com › Can-you-f...

Can you freeze a bomb to deactivate it like in the movies? - Quora

Quora

https://www.quora.com › Is-it-scie...

Is it scientifically plausible to soak a bomb in liquid nitrogen to prevent ...

Oct 23, 2015 — Is it scientifically plausible to soak a bomb in liquid nitrogen to prevent its detonation?

Missing: chamber ‎| Show results with: chamber

124 votes

Yes, it is. This is one of the procedures used by the British during the later stages of

I will however start with the minimum space for the world's smallest cryotherapy chamber, the Cryomed One. This takes up a floor area of 1m2.

https://theskinrepairclinic.co.uk › h...

Can you Have a Cryotherapy Chamber at Home? (C-11)

Cryofab offers standard 

liquid nitrogen

 dewars in sizes ranging from 4 in to 425 liters, making it possible to get a small 

cryogenic

 dewar. PHC Biomedical also offers cryogenic freezers in small (+/- 300 liter) and extra small (+/- 100 liter) sizes. 

PHC Holdings Corporation

Cryogenic ULT Freezers (-150°C) | PHC Biomedical

Cryogenic freezers for long-term preservation · Small (+/- 300 liter) · Extra small ( +/- 100 liter).

Cryofab

Cryogenic Liquid Nitrogen Dewars & Accessories - Cryofab

Standard liquid nitrogen dewars are available in sizes ranging from a small 4" cryogenic dewar to a large horizontal tank that holds 425 liters. Cryofab ...

MECOTEC's cryo:one is the world's smallest all-electric cryo chamber. Cryomed's Cryomed Mini is an affordable version of Cryomed One, and takes up only one square meter of space. 

So with liquid helium, you can freeze a Mercury switch on a bomb and put the bomb in a crygenic chamber.

UW Homepage

https://www.washington.edu › news

Physicists hit on mathematical description of superfluid dynamics

Jun 9, 2011 — Liquid helium-4 itself becomes a superfluid when cooled to within a few degrees of absolute zero on the Kelvin scale (minus 273 Celsius or minus ...

Missing: freeze ‎| Show results with: freeze

American Physical Society

https://physics.aps.org › articles

Explaining Mercury's Superconductivity, 111 Years ... - Physics

by M Rini · 2022 — In 1911, physicist Heike Kamerlingh Onnes used liquid helium—whose production method he invented—to cool mercury to a few kelvins, ...

Missing: freeze ‎| Show results with: freeze

Reddit · r/Damnthatsinteresting

70+ comments · 2 months ago

Freezing Liquid Mercury : r/Damnthatsinteresting

It made the shell from water in the air I see now. So it was frozen mercury. Cool

Anyways, some other cool stuff above related to Mercury and liquid helium-4.

They say you can use a water jet to rip the triggering device apart without damaging the explosives.

NBC News

https://www.nbcnews.com › wbna...

Water blade to disarm bombs

Sep 17, 2010 — A watery blade is saving the lives of American soldiers in Afghanistan. Known as the Stingray, the device uses conventional

I think the diStillwater would be the best water to use for these devices. That project water for the bamboo squad.

Homeland Security (.gov)

https://www.dhs.gov › 2020/03/03

New Water Cannon Technology a Breakthrough for Bomb Squads

Mar 3, 2020 — DHS S&T, in partnership with the FBI, has fully transitioned ReVJeT tool to each and every one of the hundreds of state and local bomb ...

Missing: distilled ‎| Show results with: distilled

Quora

https://www.quora.com › Do-real-...

Do real bombs have a wire that will defuse the bomb if cut?

Jun 11, 2020 — Usually that's the wire that carries the electrical charge to the detonator, since most modern explosives require more energy than a

As you see here, diStillwater cannot conduct electricity because it has no IONs.

Distilled water cannot conduct electricity because it does not contain ions while rain water conducts electricity as it contains ions due presence of …

Why does distilled water not conduct electricity, whereas ...

BYJU'S

Distilled water does conduct electricity. At room temperature, it contains 10-7 M each of H+ and OH-. These …

Does Distilled Water Conduct Electricity? | Physics Van | UIUC

University of Illinois Urbana-Cham...

Distilled

 water is a poor conductor of electricity because it doesn't contain dissolved salts, minerals, or acids. When electricity passes through salts, they 

dissociate

 into ions, which are responsible for the

conductivity

 of tap water. Distilled water has a low conductivity range of 0.5 to 3 µS/cm. 

Atlas Scientific

What Is The Conductivity Of Distilled Water? - Atlas Scientific

Sep 23, 2022 — Distilled water is a form of pure water stripped of dissolved impurities and free ions. Distilled water is therefore unable to conduct electricity because it has a low conductivity range of 0.5 to 3 µS/cm.

BYJU'S

Explain why, distilled water does not conduct electricity but tap water conducts some electricity.

byjus.com

Distilled water is a poor conductor of electricity because. - BYJU'S

Distilled water is water in its purest form. It does not contain any type of salts, minerals or acids. So, it cannot conduct electricity, i.e. it is a poor conductor of electricity. Q.

Distilled water is the purest form of water, stripped of dissolved 

impurities

 and free ions. 

You can make distilled water more

conductive

 by adding salts, like through washing your body with distilled water. 

In laboratory work, distilled water is used for reactions to avoid side reactions that could create systematic errors in results. 

So I'm watching a show on Netflix called Furies and they're trying to deactivate a bomb.

So using distilled water will work to deactivate a bomb.

[china-cryogenic-tanks]

Liquid argon cylinders

DSW is a leading provider of liquid cylinders designed to safely contain a variety of liquefied gases, including nitrogen, oxygen, argon, and carbon dioxide. These gases are stored at incredibly low temperatures, maintaining a liquid state within the cylinders. The Dewar cylinders offered by DSW come in a range of sizes and capacities, providing flexibility to meet diverse storage requirements.

One key advantage of DSW's liquid cylinders is their simplicity in infrastructure requirements and ease of maintenance and operation. This makes them a cost-effective choice for cryogenic storage needs, as they offer a practical and efficient solution for storing and transporting liquefied gases.

Liquid argon tanks and cylinders are specifically engineered by DSW for the safe storage and transport of liquid argon, ensuring the integrity of the gas throughout the process. Similarly, liquid oxygen bottles provided by DSW offer a cost-effective alternative for cryogenic storage when compared to other options available in the market.

DSW's liquid cylinders stand out as a reliable and economical choice for businesses and industries requiring safe and efficient storage solutions for liquefied gases, meeting a variety of storage needs with their range of sizes and capacities.

[jhavelikes]

In practical terms, the magnetic signal produced by neural currents in the nanoampere (10−9 A) range is formidably weak. Extracranial magnetic inductions are typically measured on a scale of femtoteslas (10−15 T), about 10 to 100 million times smaller than the Earth's static magnetic field. This reality imposes a need for sensitive sensor technology. The present industry standards rely on pick-up coils coupled with superconducting interference devices (SQUIDs)2,3. SQUIDs exploit the principles of quantum physics for the detection of small electrical currents, like those induced by weak magnetic signals, with high sensitivity and large dynamic ranges. State-of-the-art commercial systems feature coil magnetometers arranged in whole-head arrays of about 300 independent channels, sampled at up to 30 kHz simultaneously. Magnetic induction travels through the air: MEG sensors are not attached to the scalp, as the entire sensing apparatus is embedded in a thermally insulated tank, called a dewar, filled with 70–100 L of liquid helium. Superconducting temperatures minimize thermal noise and therefore optimize data quality. Consequently, subject preparation times are much shorter than in EEG, as the contactless and gel-free sensors do not need to be positioned and carefully verified manually.

Magnetoencephalography for brain electrophysiology and imaging | Nature Neuroscience

[qianjunwang]

When it comes to selecting the appropriate cryogenic tank container manufacturers or suppliers

When it comes to selecting the appropriate cryogenic tank container manufacturers or suppliers, it is crucial to consider the material and construction of the dewars and cryogenic vessels, especially when storing or transporting different types of cryogenic liquids. Stainless steel and aluminum are commonly utilized materials due to their excellent thermal insulation properties and durability.

Cryogenic tank containers manufactured by reputable suppliers play a vital role in ensuring the safe and efficient storage and transportation of cryogenic liquids. These containers are designed to handle the extreme temperatures and maintain the integrity of the stored substances.

Stainless steel is a preferred material for cryogenic vessels due to its exceptional resistance to corrosion, high strength, and ability to withstand low temperatures. It provides reliable thermal insulation, minimizing heat transfer and reducing the risk of cryogenic liquid evaporation. Stainless steel cryogenic tank containers are widely used in various industries, including medical, research, and industrial applications.

Aluminum is another popular choice for cryogenic vessels due to its lightweight nature and corrosion resistance. Aluminum cryogenic tank containers offer ease of handling and transportation while maintaining the necessary structural integrity. These containers are suitable for applications where mobility and frequent relocation of cryogenic liquids are required.

While stainless steel and aluminum are commonly used materials, it's important to note that glass dewars are also available for specific applications. Glass dewars provide the advantage of visibility, allowing users to monitor the levels of cryogenic liquids inside the container easily. However, it's worth mentioning that glass dewars are generally considered to be less durable compared to their stainless steel or aluminum counterparts. They may be more prone to damage and require careful handling to prevent breakage.

When selecting cryogenic tank container manufacturers or suppliers, it is crucial to ensure that they adhere to strict quality standards and regulations. Working with reputable suppliers ensures that the dewars and cryogenic vessels are constructed using high-quality materials, undergo rigorous testing, and meet the necessary safety requirements.

In conclusion, the material and construction of dewars and cryogenic vessels play a significant role in the storage and transportation of cryogenic liquids. Stainless steel and aluminum are commonly used materials due to their excellent thermal insulation and durability. Glass dewars, while providing visibility, are generally less durable. When choosing cryogenic tank container manufacturers or suppliers, it is essential to prioritize quality and adherence to safety standards to ensure the efficient and secure handling of cryogenic substances.

[usafphantom2]

WHY DID THE SR-71 REFUEL AFTER TAKE OFF?

Shortly after takeoff, the SR 71 rendezvous with a specially modified KC-135Q tanker at 25,000ft and top up the jet’s tanks with specially developed JP-7 fuel. This purged the tanks of air, and as the fuel was burned the resulting void was filled with gaseous nitrogen (LN2) to prevent inadvertent fuel vapor ignition from the hot, wet tanks. This is the reason why there was a refueling so shortly after takeoff, it was not because of the leaking of the fuel. ( it did leak, but not that much) it was to prevent combustion of the fuel. A yo-yo flight was possible, but it was very difficult to purge all of the nitrogen out of the air, but they could do it.. To purge the air out of the SR 71 was imperative to its safety.

Here is a quote from SR 71 pilot Rich Graham he explains it best. The JP-7 fuel reaches temperatures well over 300 degrees F. during Mach 3 cruise. , making the fumes in each of the six fuel tanks very volatile and potentially explosive. The metal skin of the aircraft approaches 400 degrees F., adding to the volatility of the fuel inside the tanks. One of our aircraft limitations was a maximum speed of Mach 2.6 without an inert atmosphere inside the fuel tanks.

“The aircraft had three liquid nitrogen Dewar flasks containing 260 liters of liquid nitrogen, located in the nose wheel well. The only way to ensure 100 percent inert atmosphere in each fuel tank was to refuel the plane inflight completely full of JP-7, allowing ambient air in each fuel tank to vent overboard. Once full of fuel, gaseous nitrogen would now dominate each fuel tank’s empty space above as it burned off JP-7. The nitrogen gas pressurized each fuel tank to 1.5 psi above ambient pressure and inerts the space above the heated fuel to prevent autogenous ignition. This is why we refueled after takeoff."

"Then we could safely accelerate beyond Mach 2.6.” “There was one other way of achieving tank inerting, called a Yo-Yo. but this was a maintenance nightmare. A few of our missions required the SR-71 to accelerate to Mach 3+ right after takeoff with a 65,000-pound fuel load. The Yo-Yo procedure had the crew chief completely refuel the plane to full tanks of 80,000 pounds of fuel. Then, with the nitrogen pressurization system working, they de-fueled 15,000 pounds of JP-7, ending up with a 65,000 pound fuel load and a plane that was capable of going immediately to Mach 3+.”

~Linda Sheffield

@HABUBRATS71 via X

[williamjone]

Liquid nitrogen dewar and cryogenic nitrogen dewars

Liquid nitrogen dewar also known as a cryogenic dewar or LN2 dewar, is a specialized container designed for the storage and transportation of liquid nitrogen (LN2) at extremely low temperatures. Liquid nitrogen is a cryogenic liquid with a boiling point of around -196 degrees Celsius (-321 degrees Fahrenheit) at atmospheric pressure. Due to its extremely cold temperature, it requires specialized storage solutions to prevent rapid evaporation and maintain its cryogenic properties.

Here are some key points about liquid nitrogen dewars:

Design and Construction: Liquid nitrogen dewars are typically constructed from materials with low thermal conductivity, such as stainless steel or glass-reinforced plastic, to minimize heat transfer from the environment. They consist of an inner vessel to hold the liquid nitrogen, an insulating vacuum layer to reduce heat transfer, and an outer protective casing.

Double-Walled Insulation: The most common design for liquid nitrogen dewars involves a double-walled vacuum insulation. This vacuum layer between the inner and outer walls significantly reduces heat transfer through conduction and convection, helping to keep the liquid nitrogen cold and reducing the rate of evaporation.

Capacity: Liquid nitrogen dewars come in various sizes, ranging from small containers with capacities of a few liters to large tanks that can hold thousands of liters. The choice of dewar size depends on the intended use, storage duration, and amount of liquid nitrogen needed.

Pressure Relief: As liquid nitrogen evaporates, it produces nitrogen gas, which can lead to an increase in pressure inside the dewar. To prevent excessive pressure buildup, liquid nitrogen dewars are equipped with pressure relief valves to maintain safe operating conditions.

Handling and Safety: Proper handling of liquid nitrogen and its dewars is crucial due to the extremely low temperatures involved. Protective gear, such as gloves and goggles, should be worn when handling liquid nitrogen, as contact with skin can cause severe frostbite. Additionally, adequate ventilation is important to prevent nitrogen gas buildup in enclosed spaces.

Applications: Liquid nitrogen dewars are widely used in various fields, including scientific research, medical applications, and industrial processes. They are used for freezing and preserving biological samples, cooling sensitive equipment, and conducting experiments in low-temperature environments.

Filling and Refilling: Liquid nitrogen dewars need to be periodically refilled as the stored liquid nitrogen evaporates over time. This can be done by transferring liquid nitrogen from a larger storage tank using proper safety procedures.

Transportation: Some liquid nitrogen dewars are designed for safe transportation of the cryogenic liquid. These transport dewars are equipped with features to minimize liquid nitrogen evaporation during transit.

Cryopreservation: In medical and biological applications, liquid nitrogen dewars are used for cryopreserving cells, tissues, and even human reproductive material like sperm and eggs. The extremely low temperatures of liquid nitrogen help preserve biological samples for extended periods.

It's important to note that working with liquid nitrogen and its dewars requires proper training and adherence to safety guidelines due to the potential hazards associated with cryogenic temperatures and pressure. Always follow recommended safety practices to ensure the safe handling and use of liquid nitrogen and its containers.

Cryogenic nitrogen dewars commonly referred to as LN2 dewars, are specialized containers designed for the storage, transportation, and handling of cryogenic nitrogen, specifically liquid nitrogen (LN2). Cryogenic nitrogen dewars share many similarities with general liquid nitrogen dewars, but they are designed to accommodate the unique properties and requirements of cryogenic nitrogen.

Here are some important aspects to consider when writing an article about cryogenic nitrogen dewars:

Extreme Cold Storage: Cryogenic nitrogen dewars are built to handle the extremely low temperatures of liquid nitrogen, which boils at around -196 degrees Celsius (-321 degrees Fahrenheit). The dewars are constructed using materials with low thermal conductivity to minimize heat transfer and maintain the cryogenic state of nitrogen.

Construction and Insulation: Similar to other dewars, cryogenic nitrogen dewars have double-walled insulation with a vacuum layer in between. This design significantly reduces heat transfer, thereby prolonging the retention of cryogenic temperatures and minimizing LN2 evaporation.

Pressure Control: Cryogenic nitrogen dewars are equipped with pressure relief systems to manage the buildup of nitrogen gas as the liquid nitrogen evaporates. This ensures that the internal pressure remains within safe limits.

Variety of Sizes: Cryogenic nitrogen dewars come in various sizes, catering to different storage needs. They can range from small portable units used in laboratories to larger tanks used in industrial and research settings.

Applications:Discuss the diverse applications of cryogenic nitrogen dewars, including cryopreservation of biological samples, cooling and freezing in scientific experiments, and industrial processes that require extremely low temperatures.

Biomedical and Medical Applications: Highlight the use of cryogenic nitrogen dewars in medical and biomedical fields for cryopreserving biological materials, such as stem cells, tissues, and organs, for potential use in transplantation and regenerative medicine.

Cryogenic Research: Detail how cryogenic nitrogen dewars are used in various research fields, such as physics, chemistry, and materials science, to create controlled low-temperature environments for experimentation.

Transport and Safety: Discuss the challenges and safety considerations associated with transporting cryogenic nitrogen dewars. Proper handling, training, and protective equipment are essential due to the extreme cold and potential hazards.

Maintenance and Refilling: Describe the maintenance requirements of cryogenic nitrogen dewars, including regular inspection, leak testing, and refilling procedures. Explain how liquid nitrogen is replenished in these dewars using established safety protocols.

Future Trends: Explore any emerging technologies or advancements in cryogenic nitrogen dewar design, materials, and safety features that are shaping the field.

Environmental Impact: Consider the environmental aspects associated with LN2 dewars, such as nitrogen gas release and energy consumption due to evaporation. Discuss any efforts to reduce these impacts.

Regulations and Standards: Highlight relevant regulations and standards governing the use, handling, and transportation of cryogenic nitrogen and its dewars.

Cryogenic nitrogen tanks would cover various aspects related to their design, applications, safety considerations, and importance in various industries.

Introduction to Cryogenic Nitrogen Tanks:

Briefly explain what cryogenic nitrogen tanks are and their significance in storing and handling extremely cold substances.Highlight their role in maintaining the cryogenic state of nitrogen which is essential for various applications.

Design and Construction:

Describe the construction of cryogenic nitrogen tanks, including double-walled insulation with vacuum layers to minimize heat transfer.Explain how the inner vessel holds the liquid nitrogen, while the outer shell provides protection.

Thermal Insulation and Dewar Technology:

Detail the importance of thermal insulation in cryogenic nitrogen tanks to prevent heat transfer and maintain low temperatures.Discuss the concept of Dewar technology and its role in minimizing evaporation rates.

Applications of Cryogenic Nitrogen Tanks:

Biomedical: Cryopreservation of biological materials, tissue samples, and even human reproductive cells.

Scientific Research: Creating controlled low-temperature environments for experiments in fields like physics, chemistry, and materials science.

Medical and Pharmaceuticals: Storage of vaccines, blood products, and temperature-sensitive medications.

Food Industry: Freezing and preserving food products, especially those requiring low-temperature storage.

Energy and Electronics: Cooling superconducting materials, semiconductors, and industrial equipment.

Industrial Processes: Cryogenic nitrogen for inerting, purging, and cooling in various manufacturing processes.

Safety Considerations:

Emphasize the importance of safety when dealing with cryogenic nitrogen tanks due to the extremely low temperatures and potential hazards.

Address the risk of frostbite, as well as oxygen displacement when working with cryogenic gases.

Handling and Training:

Discuss the need for proper training and protective gear when handling cryogenic nitrogen tanks.Highlight the importance of well-ventilated areas and controlled environments.

Transportation and Storage:

Explain the challenges and safety measures associated with transporting cryogenic nitrogen tanks due to their contents and low temperatures.Describe the guidelines for proper storage of both filled and empty tanks.

Maintenance and Refilling:

Detail the maintenance practices necessary to ensure cryogenic nitrogen tanks function properly and safely.Explain the process of refilling tanks as liquid nitrogen evaporates over time.

Environmental Impact and Sustainability:

Discuss any efforts within the industry to optimize energy consumption during cryogenic nitrogen production and reduce waste.

Regulations and Standards:

Mention relevant regulations and standards that govern the use, storage, and transportation of cryogenic nitrogen and its tanks.

Future Trends and Innovations:

Explore any advancements in cryogenic tank design materials, and technologies that are enhancing safety, efficiency, and performance. Summarize the significance of cryogenic nitrogen tanks across industries, emphasizing their role in enabling various scientific, medical, and industrial advancements.ensure you gather information from reputable sources, cite relevant studies or industry standards, and provide practical examples to illustrate the applications and importance of cryogenic nitrogen tanks.

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Cryogenic tanks, also known as liquid nitrogen containers or liquid nitrogen dewars, are essential components in the energy sector. They are designed to store large amounts of liquid nitrogen at cryogenic temperatures and provide a safe way to transport and store it. This makes them extremely useful for a variety of industrial needs, such as storing materials used in the production of energy products and providing long-term storage solutions for hazardous materials.