Yes, you are right about that! HUGE variety shown on their website. Mostly heavy equipment oriented stuff, versus small home metalworking or weld shop stuff, but if I had not already found the Loctite 565 on Amazon.ca, I'd had given them a call!https://www.fortgarryindustries.com/locations/fgi-lethbridge-equipment-sales/
I don’t know how far away that is from the house, those guys seem to carry everything
In my testing, I am going to try keeping the external supply psi (i.e. the output psi from the Nitrogen cylinder) notably higher than the INternal psi within the plasma cutter, and see how the cutter performas when I do that versus providing a lower incoming psi.
WARNING! Do not supply more than 90 psi to the regulator or damage and/or severe injury may occur.
Yes, I checked, and the instructions for my plasma cutter say to set its built-in regulator for no more than 75 psi. The instructions are unclear as to whether that means I should ALSO not let more than 75 psi come to the machine, or whether it is ok to feed a higher psi to the machine, but keep the INTERNAL regulator set to 75 psi or lower.Jim, I think you're on to a useful approach.
Every regulator will have a maximum supply pressure; your unit's internal regulator may be rated for more/less supply pressure than the Everlast unit. Along with the previous advice to use large diameter hose and fittings and short hose lengths, maximizing the supply pressure is helpful to ensuring adequate flow at sufficient pressure. If you feel that the supply pressure rating on your unit's regulator is too low, you could install an external regulator, with a higher supply pressure rating at sufficient flow rating, immediately before your plasma cutter.
At the tank, regulate the pressure to the safe maximum for your hose and fittings.
At the supply entering the plasma cutter, regulate the pressure to the safe maximum for your internal regulator.
In the plasma cutter, regulate the pressure to minimum required for acceptable cutting performance.
Yes, I was offered a 2300 or 2400 psi N2 cylinder and went with that.So @JimGnitecki did I understand you ultimately selected a 2400 psi N2 cylinder?
Re pressure drop of lines flowing gas, these links may be useful
Calculate pressure drop in compressed air pipe lines - metric and imperial units.www.engineeringtoolbox.com
There are multiple reaosns that some operators use Nitrogen or Argon for plasma cutting or airbrushing. Quality is one. Noise is another. Eliminating oxidation is another. Better temperature stability is yet another (this reason, along with zero moisture content no matter what, is why Nitrogen is used in vehicle tires).Its been a while since I looked at this stuff, but I think pressure drop in fittings is a bit different again. If I remember correctly, some equate the fitting (ID, type of bend, passage length...) to X length of pipe equivalent so you can refer to same pipe charts & estimate their drop contribution. Then there are orifice calculators that have D/d & other parameters?
I also recall regulators may have their own criteria in terms of flow rate, delta-P limit or relative-P. Best to check the specs. I know this is a big deal with CO2 if freeze off conditions occur (not related to water content, its a phase diagram thing). But I don't think this pertains to N2. I heard of guys doing airbrushing with N2, maybe this is why. No noise!
If i am reading that first full colour graph correctly, a 3/8" line can flow 20 CFM, but a 1/4" line only 10 CFM, so my 3/8" line with 1/4" fittings is likely a bit above 10 CFM capability. That's good.
I would like to keep the system as simple and robust as practical, so adding a flow meter and an additional pressure gauge is not attractive to me, especially since the additional hardware would need to somehow hang precariously off the water filter male 1/4 NOT fitting on the plasma cutter. This also works against keeping the system portable and compact, so that it can be put away when not in use, as my shop space is under 400 sq ft.Hi Jim, you are sure on one amazing journey. My hat is off to you for being so persistent.
While it is reasonable for you to make the assumption above about 1/4" fittings, it isn't a given. Gasses are not as sensitive as liquids, but generally the higher the pressure the more liquid like they become. While you can probably calculate the overall system flow rate capacity, I'd recommend measuring it instead with a flow gauge or meter. I don't have a price in my head but I don't think they are out of sight.
By measuring the actual flows, you can better tune your system because you know the actual results vs guessing or estimating them. You might find you need bigger fittings because the fittings have more of an affect on flow than you guessed.
A few pressure gauges here and there in your system will also be helpful while tuning it.
I would like to keep the system as simple and robust as practical, so adding a flow meter and an additional pressure gauge is not attractive to me,
What specifically do I buy that would fit via 1/4 NPT quick disconnects between my airline and the plasma cutter? The combination regulator/psi gage/flow meters I have seen have Argon gas fillings versus NPT threads that can accept male or female QD fittings. (I am very new to this gas flow hardware stuff!)I would never advocate a permanent install. Just a temporary setup so you know what is happening instead of guessing.