Electronics > Projects, Designs, and Technical Stuff
Calculating heat dissipation requirements for high pressure compressor... ?
coppercone2:
flow adjustment is preferred for those welders I thought. I mean two regulators, one to regulate pressure, and one to regulate flow is better (I think, and you might need a big expansion tank thats run at a intermediate regulated pressure to benefit, and the large size of the cylinder might make it irrelevant all together), but I learned somewhere that overall flow control would beat a pressure control regulator for gas shielding. I do not think its the cheaper solution unless you get a dual regulator system,, and I believe that would only be useful if you are welding REALLY long beads, like robot welders.
For whatever reason, they are more expensive anyway
https://www.harrisproductsgroup.com/en/Expert-Advice/tech-tips/controlling-gas-flow.aspx
Not to mention when you bend the hoses and stuff, you change resistance of the gas path, and the important parameter is mass transfer (gas transfer), so a flow regulator if it works will give the same amount of gas output even if you bend the hose around. If a slight obstruction occurs, you still get the same amount of shielding gas if you have fixed flow, be that sputter on the gas nozzle or bent hose.
skylar:
--- Quote from: coppercone2 on May 26, 2020, 10:19:44 pm ---flow adjustment is preferred for those welders I thought.
For whatever reason, they are more expensive anyway
https://www.harrisproductsgroup.com/en/Expert-Advice/tech-tips/controlling-gas-flow.aspx
--- End quote ---
Flow is the important metric as it will be a roughly ambient jet at the welding nozzle. I misspoke about the flow adjust, indeed on the cheap models you do adjust the pressure across a fixed orifice so as to change the flow; really thought they were the other way abouts. That aside, the use of the orifice is gonna really limit your delivery in any typical 120PSI use case. Without a buffer tank as big as any standard LPA compressor you're not gonna find a 3kpsi reg that can handle the flow rates you would want on shop tools unless you are only using incredibly short bursts. I've heard of guys dunking the regs in a warm water bath, but that's not practical.
More to the point of the main topic, I would also like to mention that SCUBA fellers usually have their compressors inside something hefty. Seen lots of old intermodal boxes converted into a tank room, with the tanks themselves also in individual heavy wall pipe with water or at least misters on for heat and explosion dampening. I bring this up to try once again to convince yall to keep the HPA outside and away from yourself where it belongs, all this multistage pressure buses and tanks is just gonna bite ya.
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