I had a lot of galvanized steel pipe and fittings lying around so I decided to build a high power steel pipe air cannon. This cannon is a lot safer than PVC ones because steel pipe is rated for compressed air, unlike PVC. This design also allows for interchangeable barrels.
Galvanized steel pipe and fittings
PVC primer and cement
PVC pipe and fittings.
Large hose clamp
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Step 1: Air Tank
The air tank consists of two 1.5" x 12" steel pipe nipples connected by a coupling and sealed at one end with an end cap.
Step 2: Barrel
The barrel consists of 48" of 3/4" PVC pipe connected to a bushing and 1" male adapter. It is okay to use PVC pipe for the barrel because it is not under constant pressure. I added a self tapping screw to prevent ammunition from being pressed too far.
Step 3: Fill Valve
The fill valve is a gas line pressure test tool. I replaced the included 15 psi gauge with a 160 psi gauge. This allows the air cannon to be filled using a bike pump or air compressor.
Step 4: Strapping
To strap the air tank to the barrel, I used a piece of plastic pipe and added a hose clamp for stability.