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  • imsmooth commented on imsmooth's instructable Nitrogen Gas Generator
    Nitrogen Gas Generator

    I have 18lbs of CMS-228 (carbon molecular sieve) that I do not need. It is the key ingredient for the N2 generator. At 115 PSI you can get 98% N2 at 355 L/h/kgAt 115 PSI you can get 99.99% N2 at 70 L/h/kgPlease message me if you are interested. I will sell it for $40 plus the shipping.

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  • imsmooth commented on imsmooth's instructable Nitrogen Gas Generator
    Nitrogen Gas Generator

    Go to my webpage www.homemadeliquidnitrogen.com/PSA and find the arduino valve controller section. You can click on a link to view the code

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  • imsmooth commented on imsmooth's instructable Induction Heater 12 KW
    Induction Heater 12 KW

    I specifically go over levitation and design build on youtube on my imsmoother channel. I have put together a playlist that you should look for that goes over design considerations, schematics and techniques for handling the high power. https://www.youtube.com/playlist?list=PLK_Je1TKuxtbtrYb9hET-nULzFN_jNbUEHere is a recent video To directly answer the question you will need an input of 240vac drawing about 30-35A.

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  • imsmooth commented on imsmooth's instructable Nitrogen Gas Generator
    Nitrogen Gas Generator

    Liquid hydrogen is a whole different thing. Storing liquid gases requires constant venting since you can not keep them in a liquid state at ambient temperature. This presents an explosion risk as either are extremely dangerous.

    You can build the same device but collect the exhaust gas which would be mostly oxygen.

    Why do you need the oxygen?

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  • Homemade Liquid Nitrogen Generator

    Compressor $1000Other stuff $500

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  • Homemade Liquid Nitrogen Generator Using Joule Thomson Effect

    That looks like a Stirling cooler, which I also have. It is a closed system containing helium and moves heat from the cold end to the hot end. The fan cools the hot end. A fine tube gently flows your air/N2 into the vacuum dewar for cooling. It does not make as much as a larger system, but it does make liquefied gas and it is safe. I have to look but I think it runs on 12vac. You just need a variac to set the correct voltage/current and you are set. I got mine on ebay. You have to run it in a cool place. If the ambient is too high it will not be able to get down far enough.

    send me your email

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  • Homemade Liquid Nitrogen Generator Using Joule Thomson Effect

    You know that there are small professional systems for sale like ELAN2. My system is not a turn-key system.

    The professional units seems to just require you to turn on a switch. Based on the size I am guessing they have a self-contained refrigerant in a closed system. With mine you have to constantly monitor the pressure on the throttle valve, which is liquefying the gas. Because it is not closed, and the scrubber does not remove 100% of the CO2/H20, I have to adjust the valve so it does not obstruct in the beginning of the cool-down. Once a certain temperature is reached I no longer have to monitor it.

    The SCUBA compressor needed to generate the 3000 PSI pressure cost $1500 for starters. The regeneration tower cost about $750 in materials and time. The CO2/H20 scrubber is about $250. Still interested?

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  • imsmooth commented on imsmooth's instructable Nitrogen Gas Generator
    Nitrogen Gas Generator

    The website was published 01/13/2014

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  • Homemade Liquid Nitrogen Generator

    Good eye. Those are coaxial anesthesia circuit sets. They were free and I use them on the last 10-15 feet of my final version. On the final version, seen in the video, I use teflon tubing on the cold section because it can withstand the cryogenic temperatures. My first version, using the blue recycle can, I only used the anesthesia circuit to see if I could get to cryogenic temperatures. I did, but the tubing after a few runs cracked because the plastic could not withstand the temperatures. Of course, the last leg of the regenerative circuit gets close to ambient temperature so it retains its integrity.

    No calculation. Just made it as long as possible. Longer path means more time for cooling. Also, the work the gas does against the resistance helps drop the temperature. I'm sure you can get away with a shorter length, but your cooling time will be longer. I'd like to see someone do this with a regular refrigerator compressor.I've measured the temperature going back in and it is lower, and any temperature gradient is worth utilizing. My nitrogen generator is not able to keep up with the amount of nitrogen removed from the system once it liquefies, so scavenging the exhaust nitrogen keeps the percent composition of the intake gas over 95-97% for me.

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  • Running the system with pressurized 98% O2 would be dangerous and not something I would want to do. If I were to liquify oxygen I would pass it through copper coils that are submerged in liquid nitrogen, which has a lower boiling point. There are some videos on youtube showing this.

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  • imsmooth commented on imsmooth's instructable Induction Heater 12 KW

    I have a 50amp industrial variac. However, your rating depends on how high you want to go. If your building a 3kw heater than 10-20A is fine.

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  • imsmooth commented on imsmooth's instructable Nitrogen Gas Generator

    I initially used 1/4" stainless for venting. I changed it to 1/2" for venting.

    That's a great deal. Nice job scoring that.

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  • imsmooth commented on imsmooth's instructable Nitrogen Gas Generator

    You need to get the proper solenoid valves that can accept that voltage. If you can not find this you need to get a step-down transformer.

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  • imsmooth commented on imsmooth's instructable Induction Heater 12 KW

    Go to my website tutorial which goes into much greater detail and explains the purpose of most of the components along with schematics and picked oriole diagrams I give the name of the website at the top of this instructable

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  • imsmooth commented on imsmooth's instructable Nitrogen Gas Generator

    No oil when using concentrated O2. You should be able to find some lithium or silicon grease. Many SCUBA compressors use something like this. I've had one valve stick once and I fixed it by cleaning the solenoid valve. I probably have a reference on my Liquid N2 site at www home made liquid nitrogen dot com

    No, 40 psi works fine. Make sure you are connected to the correct port. They should just work. I would call the company.

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  • imsmooth commented on imsmooth's instructable Nitrogen Gas Generator

    The valve opens when under pressure. The gas goes one of the two on top and through the single vent on the bottom, pressurizing the tank. When the power goes off the pressure pops the valve, opening the other vent. If the valve is not brand new there may be dirt that is making the solenoid stick and you will need to carefully disassemble and clean it. You can also call Versa. If you do not like your valves I have two for sale that work perfectly.

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  • nooil residue mixed with liquid oxygen causes explosions

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  • imsmooth commented on imsmooth's instructable Nitrogen Gas Generator

    The project will probably run about $1000

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  • Interesting. I might try it and see if there is a significant difference. I would have to use a solder gun and not a torch. If I used a MAPP torch the temperature might change the properties of the steel tubing, reducing its failure pressure rating and risk a pipe rupture. Solder, though, may not stick to the smooth stainless steel surface. I'll post my findings if I do it.

    Thank you.

    Alysson I'm just curious I've received a lot of comments today how did you find this instructable? was it featured somewhere ?

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  • imsmooth commented on imsmooth's instructable Nitrogen Gas Generator

    Look at the videos on the link. O2 diffuses into the porous CMS due to the high pressure and N2 rich gas exists.http://www.homemadeliquidnitrogen.com/PSA/CMS%20material.html

    Visit www.homemadeliquidnitrogen.com/PSA for more information.Each tank is isolated with a solenoid gas valve. Both tanks join at the bottom and feed to a flow valve that controls the amount of gas that exists. This allows the pressure to build since more gas is going in than coming out. See the diagrams at the above link.

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  • imsmooth commented on imsmooth's instructable Nitrogen Gas Generator

    I think I left the contact information on my website tutorial for the N2 generator.

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  • imsmooth commented on imsmooth's instructable Nitrogen gas generator

    I currently have a matching pair of two brass Versa 1/4" 3-way valves that I used for this project. If you are interested in them you can email me privately. They are $130 a piece or $240 for the pair. They are practically brand new and in perfect working condition.

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  • imsmooth commented on imsmooth's instructable Nitrogen gas generator

    Send me your email and I'll reply back with the arduino file you need for the build.

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  • imsmooth commented on imsmooth's instructable Nitrogen gas generator

    I think if you go to my website tutorial the code is there.http://homemadeliquidnitrogen.com/PSA

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  • Air. You should read the full explanation at www.homemadeliquidnitrogen.com

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  • imsmooth commented on imsmooth's instructable Nitrogen gas generator

    I got mine from Interra Global. See if Bill Wallace is there. He helped me.Tell them Crystal Clear Solutions referred you. I don't get anything from it but I'd like them to keep track of this. Let me know if they can help.

    Yes, you can use one tank if you don't mind a non-continuous supply. You still need a means to cycle the pressure/depressurization.

    Smaller scale - yes.With PVC? Not a good idea. With the given diameter of the tube and a pressure over 100psi you risk bursting the tube and getting shrapnel in your body.

    You can get a little more info at www.homemadeliquidnitrogen.com/PSA

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  • imsmooth commented on imsmooth's instructable Induction Heater 12 KW

    The sensor gives a reading of the AC current waveform that drives the coupling transformer connected to the RLC tank (the part with the Celem capacitor and work coil). This is not necessary to get the circuit to work: it provides information on the proper function of the system. Knowing this, I attached a diode and smoothing capacitor to a DC ammeter to get a constant analogue reading of the current. This is important, because if the current gets too high I know I will overheat the mosfet switches. For the smaller circuit this was about 20A; for the 10kw units this was about 50-60A for short periods. I used a voltage divider to feed the current value into the uProcessor and wrote a subroutine that constantly monitored the current. If it got too high I detuned the circuit to reduce th…

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    The sensor gives a reading of the AC current waveform that drives the coupling transformer connected to the RLC tank (the part with the Celem capacitor and work coil). This is not necessary to get the circuit to work: it provides information on the proper function of the system. Knowing this, I attached a diode and smoothing capacitor to a DC ammeter to get a constant analogue reading of the current. This is important, because if the current gets too high I know I will overheat the mosfet switches. For the smaller circuit this was about 20A; for the 10kw units this was about 50-60A for short periods. I used a voltage divider to feed the current value into the uProcessor and wrote a subroutine that constantly monitored the current. If it got too high I detuned the circuit to reduce the current. This is useful if the workpiece falls out of the coil. When this happens the current shoots up without anything to quench the tank. Having this feedback I could quickly reduce the current and protect the mosfets. I was thinking of producing a second generation board that would also get input from a thermocouple connected to the mosfets and would shut the system down if the temperature got too high. I never did it as I sold my project to a blacksmith.I hope this helps. You can go to my site http://inductionheatetutorial.com for a little more information.

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  • imsmooth commented on imsmooth's instructable Induction Heater 12 KW

    If you look at this schematic from my tutorial websitehttp://inductionheatertutorial.com/inductionheater...the sensing transformer is there on the right side.

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  • You can get a better idea of the parts and cost at my tutorial website:http://homemadeliquidnitrogen.com

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  • imsmooth commented on imsmooth's instructable Nitrogen gas generator

    Very nice. I built my analyzer. However, I got the O2 electrode from an anesthesia machine. You will have to find that part. The rest just involved building a circuit that could sense the voltage generated by the electrode and convert that to a value between 0 and 100.

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