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Homemade water gun

K

kevinthenerd

Platinum Member
I want to build my own extremely high pressure homemade water gun. It might double as a pressure washer or a water cutter one day. PVC will be way too weak. Do you think galvanized pipe is a good choice for this application? Where can I find high-pressure valves? Will brass do the trick?
 
Originally posted by: acemcmac
why don't you just get it over with and buy a pressure washer
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even with a gas motor, it's not powerful enough, and the nozzle is usually too large for use as a water cutter
 
Wow, a water cutter runs at 60000-80000 psi. I have a long way to go to get that kind of pressure.

Edit: At 200 micron diamater with mach 3, you're using only a half a gallon per minute.
 
ahhh spring...
that time of year when a young mans fancy turns from that of sitting by the fire....
to cutting down friends with highly pressurized water 😕
 
How skilled are you?

You do realize under that much pressure, if you fvck up on your design, you're going to be carted off in a body bag, right? Well at least what pieces they can find of you.
 
Originally posted by: BigJ
How skilled are you?

You do realize under that much pressure, if you fvck up on your design, you're going to be carted off in a body bag, right? Well at least what pieces they can find of you.
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No doubt. It would blow up the building. If I fvck up a design as a professional engineer later, I'd rather it be my own life than the life of someone else.
 
It's amazing to think that, for safety and fatigue longevity, systems like that have to be designed to withstand more than 100000 psi. That's simply crazy to me.
 
Originally posted by: drnickriviera
You're determined to die in a blaze of glory aren't you? PSU welder, Race car made from galvanized fence rail, now this.
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Hell yeah. QFT.

For the record, I gave up on the welder and bought one. If and when I decide to build a race car chasis, I'm going with DOM tubing or maybe chrome-molly.
 
Originally posted by: mercanucaribe
Originally posted by: Crescent13
diamond ftw? It can withstand up to 14.5 million PSI.
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It would probably crack if you make something that big out of diamond.
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When I first learned about synthetic diamond production, the first thing that came to mind was making an engine block out of it. It has the highest thermal conductivity of any pure substance (ignoring what they're doing these days with two-phase flows), and it's strong.

The trouble comes when you have an unexpected load (like a back fire or something). A metal will simply yield, but it will more than likely hold. A brittle material is all or nothing. There's no warning if it's about to break.

Diamond is obviously too expensive and impossible to work with. I don't have a laser cutter (yet).
 
Originally posted by: TheoPetro
are you looking at something you can hold? cuz galvanized pipe gets pretty damn heavy at higher diameters.
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I held a 10' piece of 2" ($50 at Home Depot) when considering my last project's materials. I had a hard time holding it. (It was the thickest they offered in the size.)
 
Originally posted by: Drakkon
ahhh spring...
that time of year when a young mans fancy turns from that of sitting by the fire....
to cutting down friends with highly pressurized water 😕
Click to expand...

Well, if fire is on your mind, I could always fill it with gasoline or something, but I'd have to work up a bit more courage to pressurize gasoline in a homemade water gun.

Edit: Google the video of the homemade flame thrower that uses windshield washer concentrate, which I believe is methanol.
 
http://www.anvilfire.com/FAQs/hydraulic_piping.htm
I normally reccomend schedule 80 up to about 3000 psi, and then go to schedule 160. At 10,000 and above I suggest the move to a coned and threaded system. I have worked at pressures up to 30,000psi with the trheaded and coned system.
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Edit:
http://www.anvilfire.com/FAQs/hydraulic_piping.htm
If you assume a factor of safety of 6 to 1 for pipe, which is a hydraulic industry minimum standard, schedule 80 above 1/8" pipe size is not thick enough for 3000 psi. Most of the hydraulic work we are talking about is with 1/2" to 3/4' pipe size. Schedule 80 1/2" is 2300 psi for 6 to 1 and 3/4" schedule 80 is 1950 psi. Schedule 160 3/4" is 2780 psi for 6 to 1.
Click to expand...
 
Originally posted by: drnickriviera
You're determined to die in a blaze of glory aren't you? PSU welder, Race car made from galvanized fence rail, now this.
Click to expand...
Well, hell, son. If you got your mind on things like that then...

I need something like a combination BBQ wood smoker and pressure cooker. I want to smoke a 12 pound butt in under 3 hours.
😀
 
Originally posted by: MaxDepth
Originally posted by: drnickriviera
You're determined to die in a blaze of glory aren't you? PSU welder, Race car made from galvanized fence rail, now this.
Click to expand...
Well, hell, son. If you got your mind on things like that then...

I need something like a combination BBQ wood smoker and pressure cooker. I want to smoke a 12 pound butt in under 3 hours.
😀
Click to expand...

I know a good welder who's a total artist of steel. He made himself a VERY nice looking smoker. I wonder if I can look him up. (He's my uncle's friend, and I haven't talked to him in a long time.)
 
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