Emglos for air cannon
by Ben Capshaw
Emglo model AM78HC4V compressor
I have a used Emglo model AM78HC4V compressor factory set at 125 PSI.
I am a tinkerer and my current project is a big air cannon for the local high school.
Through a bunch of math I realized I need a compressor that can put out 250-300 PSI.
I know the pump can handle the high pressure as I disconnected the pump from everything else and plumbed it into a section of steel pipe which it easily pressurized to the max on my biggest gauge (300PSI).
So I know the pump can handle the pressure but my concern is of the old tanks seen in the pictures. I need some form of an air receiver for this system and the steel test pipe is much too small. I would like to be able to use the built in tanks but am weary of feeding so much pressure.
One thing that enhances my concern is when I received this unit, it was in much worse shape than it is in now.
I have replaced everything on it except the pump, tanks, and pressure switch.
When I first acquired this compressor the gauges were damaged and both of the drain plugs were inoperable. When I removed the lower plug (which has been replaced with a 1/4 turn valve) about one cup of dark brown water poured out and I know for a fact that the person who gave it to me had not used it in at least 5 years.
So back to the main question. As I doubt that the tanks on it are safe to use at that high pressure, what would you suggest I use for a small(2-5 gallons), portable, air tank? keeping in mind that this is for my local high school and i need to keep costs down as far as I can.