Garden Hose Pipe Pump

To go along with the 5 Gal. Diving Helmet intstrucatble I made, I built a pvc pipe pump to supply air to the helmet. All you need to connect the pump and helmet together is a garden hose. You can build the pump to any size you want, but this was all made on a cost of $30-35.

All the parts I bought were from Ace Hardware and lets just say the more complex pvc parts cost more than $2, which was a little alarming for me at first, but I was like "screw it, i'll pay!"

Step 1 Materials and Tools

When I stopped by Ace to get the parts, I recieved a lot of help from one of the workers. The parts that make up the nozzle were a brass Pipe-to-Hose fitting, two outer-threaded connectors, and a part whose name i cannot remember but it was essential to let air be sucked into the chamber and pumped into the helmet. Anyone can refresh my memory about this part.

Tools-
Hacksaw
Drill & Large Drill Bit
Dry Erase Marker
Duck Tape

Comments

[Kiteman]

So, you're underwater, and you're relying on a guy with a big bike-pump...

[EngineerJakit]

I thought of saying something witty, but nothing is coming to mind. Except increasing air pressure.

[rickharris]

At the risk of seeming a kill joy this type of diving helmet is fraught with DANGER - you need weights to get under water and IF?WHEN things go wrong your weighted down!!! NOT GOOD.

[EngineerJakit]

True, and i conducted my test with the weights on. This pump worked as well as expected and kept my helmet with some level of air, and floatation. Had I found a way to seal the underside so water would not get in the helmet, then I would have been truly safe to test it out. Luckily im a good swimmer.

[iPodGuy]

Couldn't I just use an air compressor with a long hose?

[NachoMahma]

.  Probably not. A high pressure pump will produce CO, NO_x and other nasties. A pump that uses oil will introduce oil into the air. It really needs to be a low-pressure, oil-less  pump (unless you want to filter and scrub the air before breathing).

[EngineerJakit]

This is true. Using a bike pump or something more hand-powered would be a good thing to use so that you don't choke on the air instead of the water (in the case the helmet would fail and leak.