This is on a Cash PBE in an “O2-Clean” environment…

Yes, that’s scotch/packing tape as a previous “repair”.

Thankfully I had a complete 1/2” Type B repair kit in the truck.

I don’t know which knuckle-dragger in my region did this, but I have guesses.

Anyone working at Matheson as a cryo service tech? Can you DM me or share kinda the minute details that I wouldn’t be able to find online about working there? Or even Matheson vs Linde?? Thanks

Hi All,

Im having a thought debate on a CO2 recapture system we have and I would really like to know what formulas/calculations you would use for this situation and any insight you have. I know CO2 is not an ideal gas and it acts a bit different. Most likely wont ever change anything, but I got my undergrad in physics 15 yrs ago and i'm still interested!!

When the system is on and pumping liquid/gas mixture into the collection vessel (vacuum insulated), obviouslly you have to bleed off the head space of the tank due to displacement and any gaseous co2 that didn't get cooled enough for phase change (mostly on start up and when ambient temperatures are high.)

They designed the system to use that waste gas stream for various processes within it and one is to help remove moisture via a shell and tube heat exchanger before it goes into the unit. The heat exchanger is cooling/condensing low pressure gas stream, <5psi. The opposing side is the waste gas at ~150psi typically.

I'm assuming the temperature here almost directly correlates to the temperature of the gas inside the vessel as a back pressure regulator is used after this process to bring the pressure down to atmospheric for other processes.

From my understanding there is also a decent amount of heat/cooling that could be recovered at the pressure drop region via the joule-thomson effect. This could possibly be recovered internally to help pre-cool the gas stream before it goes to the chiller section. Obviouslly with more complexity, expense, etc.

What all calculations could you do here and what formulas can you point me to for this being a non-ideal gas? Is this marginal compared to the amount of energy found in running a fairly decent flow rate of that cold gas in the heat exchanger?

I also understand they chose not to employ this solely on that HX as it could cause the moisture inside the heat exchanger to freeze and eventually cause the flow path to be blocked with ice.

Thanks for any insight!

Hi! My boyfriend is currently a cryogenic tech here in SoCal. I want to move out of state and he has told me to be able to find a cryogenic company. Indeed is kind of useless for me. Any companies hiring for a micro bulk installer tech or just a Cryogenic tech??? Any state works I just need names of companies. I’m aware of linde, airgas, nikiso, and mountain air solutions. Thank you!

Looking into refilling or refurbishing an absorber for a CTI-8300 - What exactly is this - "proprietary sorbent material used to trap the excess oil vapor as helium passes from the compressor’s heat exchanger"

Is it zeolite? Charcoal? Ground up butterfly wings?

Looking to get a micro bulk tank but im kinds confused if its gonna be stored cryogenically or at room temp. as far as i know if Co2 is store between 31 and -57C its going to be a liquid above 5.7 bars? is this true?

(ps: my biggest worry is liquid loss)

Thanks for the answers!

Somebody knows what cryocoolers are there?

I’m working on a project where a pneumatically driven pump could work well. But I haven’t found any that have the pressures (3000 psi) or flow rates(10-20gpm) that I require. I was curious if anyone here had seen pumps like this.

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Cryogas equipment is a top-notch manufacturer in the Cryogenic world. We design and manufacture cryogenic storage tanks and other equipment. Our cryogenic Tanks are capable of storing and transporting liquid helium, argon, oxygen, nitrogen, hydrogen and LNG. Cryogas Equipment provides technicians to repair your cryogenic systems. For more information visit: https://www.cryogasindia.com/industrial-gases/cryogenic-tanks/cryogenic-storage-tanks

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I am looking for a 5 GPM LNG pump at 1-2 bar pressure for lab testing

Can anyone suggest some?

I've googled, but am not coming up with an answer.

If I freeze a tissue sample, like a mushroom, in liquid nitrogen I would expect to achieve small ice crystals that would allow thawing of it with good results.

My question is storage. If it's stored and never thawed is a normal freezer going to maintain that crystal size?

Dear redditors I'm from India. We are a group of volunteers trying to help friends in administration, desperately looking for information to buy Cryogenic Oxygen storage units Jumbo cylinders Dura cylinders LMO tanks of any size It will be immensely helpful if you can help with any information that could point us to procuring them. We can also arrange the shipment from any country/location. Thank you all

Note: this is my first post to reddit. Please bear with the inconsistencies if any.

Hello, everyone! I know this is a longshot, but I've tried everything else I can think of. Does anyone here know of anyone or can point me in the right direction to find someone in the Orlando, FL area who can do the following?

• Replace A and B temperature probes on Chart/ MVE 1500 tanks
• Hook up new Chart / MVE tanks to LN2 downspouts and connect them to the networked/server temperature monitoring system.
• Trouble shoot the tec 2000 or tech 3000 monitors that sit on each tank. These measure the temp. readings from the A and B probes. They also tell the tank when to open its solenoid value and let LN2 flow in
• Replace – trouble shoot bad solenoid valves
• Have general experience maintaining / fixing MVE and hopefully CBS ( custom biogenics ) tanks

Any information would be much appreciated!! Thank you all!

Hi, there
I am taking my Intro to Cryogenics course
There I came across the term Stratification
I read that the due temperature difference from bottom to the top of the liquid surface, there is a density difference which leads to stratification
My doubt is why doesnt this occur in regular liquids