Emglos for air cannon

by Ben Capshaw
(Newport, Oregon)

Emglo model AM78HC4V compressor

Emglo model AM78HC4V compressor

Emglo model AM78HC4V compressor
Emglo model AM78HC4V compressor
Emglo model AM78HC4V compressor
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.

Comments for Emglos for air cannon

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Sep 03, 2014
sounds dangerous
by: Doug in s.d.ca

What are you planning to use for the cannon barrel? Projectile?

If the barrel can handle it, (no PVC pipe at that pressure, please) then probably the way to get gas at that pressure is to borrow/rent a CO2 tank with a big valve and regulator.
Or maybe a scuba tank.

No way you should try to use the emglo, which I guess you know, cause the tanks would be under-rated even at 150psi.

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