pressure testing
- Lockednloaded
- Staff Sergeant
- Posts: 1566
- Joined: Thu Sep 03, 2009 9:38 pm
- Location: Texas, USA
- Been thanked: 6 times
I am making a small low pressure QEV gun to sell to a friend, but I want it to be aesthetically pleasing as well as functional. when I asked what color he wanted it he said metallic blue. the first thing that came to my mind was those aluminum sigg water bottles. They are lightweight cool and need no modifications to screw into regular fittings.
The only problem is that they aren't pressure rated or pressure tested in any way. So before I slap one on a cannon and sell it away I'd like to pressure test it.
I only have a bike pump, so I will have to be pretty close while the bottle is being pressurized. It will be filled with water, but I still think it is unsafe. I have a pool, so I may even submerge it for safety.
So, any other suggestions or links to people already doing this so that I don't have to waste a good bottle?
The only problem is that they aren't pressure rated or pressure tested in any way. So before I slap one on a cannon and sell it away I'd like to pressure test it.
I only have a bike pump, so I will have to be pretty close while the bottle is being pressurized. It will be filled with water, but I still think it is unsafe. I have a pool, so I may even submerge it for safety.
So, any other suggestions or links to people already doing this so that I don't have to waste a good bottle?
I love lamp
- Gun Freak
- Lieutenant 5
- Posts: 4971
- Joined: Mon Jan 25, 2010 4:38 pm
- Location: Florida
- Been thanked: 7 times
There was a big discussion, as well as a bunch of other small discussions, on the bottles, but I don't recall anybody getting around to testing one. Find a section of PVC that the bottle fits in and cap it, then fill it with water and pressure test it in that. If using a bike pump, I would also pump by a corner of a wall or something and put the bottle around the other side of the corner so you can't be hit by any potential shrapnel.
OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
- Lockednloaded
- Staff Sergeant
- Posts: 1566
- Joined: Thu Sep 03, 2009 9:38 pm
- Location: Texas, USA
- Been thanked: 6 times
I think I will submerge it then put a small underwater brick barrier around it now. Also the bottle is too large to fit in my largest PVC pipe (3") and I can't get 4".
I've seen these type of bottles used quite often on the french forums, but I can't read french, so no info there...
I've seen these type of bottles used quite often on the french forums, but I can't read french, so no info there...
I love lamp
-
- Private 3
- Posts: 41
- Joined: Tue Sep 22, 2009 8:30 pm
That sounds more dangerous than just pressurizing the bottle as is. PVC has a lower pressure rating than any metal I know of. As for how high the bottle will take, I would guess 300+psi. Probably higher if it is well made but don't blame me if you get hurt. I almost always fire my PVC air cannon at 150ish psi and that is no problem. The PVC says on it 600 PSI. If plastic can take that then the bottle should hold for lower pressure no problem. But testing it around a corner is a good idea. Post the cannon when you finish it.
- Gun Freak
- Lieutenant 5
- Posts: 4971
- Joined: Mon Jan 25, 2010 4:38 pm
- Location: Florida
- Been thanked: 7 times
Yeah I've seen quite a few french cannons with the bottles as the chamber. I can understand french so if you give me a specific link I can get more info on it if you want.
OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
- Gippeto
- First Sergeant 3
- Posts: 2503
- Joined: Sat Jan 19, 2008 10:14 am
- Location: Soon to be socialist shit hole.
- Has thanked: 2 times
- Been thanked: 17 times
Air anywhere in the "system" being tested is BAD.
Fill the entire thing (bottle and associated hoses, guage, valves, etc.) with a fluid of some sort...as entirely as is possible. Veg oil is cheap.
Use a hydraulic pump or grease gun to provide the pressure. Grease guns are dirt cheap at Harbor freight.
Do NOT use air as the pressure source...adding air to the system virtually negates the whole point of hydro testing. You're trying to NOT store energy...compressed air = stored energy.
Fill the entire thing (bottle and associated hoses, guage, valves, etc.) with a fluid of some sort...as entirely as is possible. Veg oil is cheap.
Use a hydraulic pump or grease gun to provide the pressure. Grease guns are dirt cheap at Harbor freight.
Do NOT use air as the pressure source...adding air to the system virtually negates the whole point of hydro testing. You're trying to NOT store energy...compressed air = stored energy.
"It could be that the purpose of your life is to serve as a warning to others" – unknown
Liberalism is a mental disorder, reality is it's cure.
Liberalism is a mental disorder, reality is it's cure.
- Lockednloaded
- Staff Sergeant
- Posts: 1566
- Joined: Thu Sep 03, 2009 9:38 pm
- Location: Texas, USA
- Been thanked: 6 times
this is very thin aluminum, The PVC outer shell would only absorb the shrapnel.
I don't think the bottle will throw out shrapnel, because I am hydro-testing it, but safety first.
EDIT
I've been browsing the french site, and it seems that similar bottles have been taken to 8.5 BAR
I don't think the bottle will throw out shrapnel, because I am hydro-testing it, but safety first.
EDIT
I've been browsing the french site, and it seems that similar bottles have been taken to 8.5 BAR
I love lamp
I don't think adding a tiny bit of air to pressurize is too bad. It's less than ideal, but the volume of air is only because of the deformation of hoses, the test vessel, etc. If the air pocket is in something designed for that pressure, I see no problem with it. It will try to propel the water, but water is heavy.
Basically, you're only storing a tiny fraction of the energy you would be storing if you pressurized with air.
Granted, I don't have access to hydro-testing equipment.
Basically, you're only storing a tiny fraction of the energy you would be storing if you pressurized with air.
Granted, I don't have access to hydro-testing equipment.
POLAND_SPUD wrote:even if there was no link I'd know it's a bot because of female name
- Lockednloaded
- Staff Sergeant
- Posts: 1566
- Joined: Thu Sep 03, 2009 9:38 pm
- Location: Texas, USA
- Been thanked: 6 times
EDIT
hmmm.... I was planning on filling it with water and pumping, dang. Still, filling it with water will leave less room to pump air which equals less energy, which equals smaller explosionGipetto wrote:Do NOT use air as the pressure source...adding air to the system virtually negates the whole point of hydro testing. You're trying to NOT store energy...compressed air = stored energy.
Last edited by Lockednloaded on Fri Jul 16, 2010 7:33 pm, edited 1 time in total.
I love lamp
- SpudFarm
- First Sergeant 3
- Posts: 2571
- Joined: Sat Nov 04, 2006 9:39 am
- Location: Norway Trondheim area
I would just have stood inside a door with the pump and have the bottle burried in loose and wet sand with a carpet over on the other side.
Then just pump as hard as you can and see if anything happends.
If you fill the bottle with water and secure the hose to something so it won't whip around I don't see how it could go wrong.
Remember to set up the all important camera.
Then just pump as hard as you can and see if anything happends.
If you fill the bottle with water and secure the hose to something so it won't whip around I don't see how it could go wrong.
Remember to set up the all important camera.
"Made in France"
- A spud gun insurance.
- A spud gun insurance.
- Lockednloaded
- Staff Sergeant
- Posts: 1566
- Joined: Thu Sep 03, 2009 9:38 pm
- Location: Texas, USA
- Been thanked: 6 times
about the camera: I don't have a proper camera to film this, but if I did I would hope the film would not be very entertaining; i don't want a huge explosion. I don't even want failure.
I love lamp
- urgle the danish cow
- Specialist
- Posts: 176
- Joined: Sun Jul 26, 2009 4:48 pm
you may be able to skip this whole situation with the scary bottle by doing a nice paint job or coloring the metal the same way gun barrels are.
- Lockednloaded
- Staff Sergeant
- Posts: 1566
- Joined: Thu Sep 03, 2009 9:38 pm
- Location: Texas, USA
- Been thanked: 6 times
There are other advantages besides aesthetics. More volume and lighter weight
I love lamp
- SpudFarm
- First Sergeant 3
- Posts: 2571
- Joined: Sat Nov 04, 2006 9:39 am
- Location: Norway Trondheim area
I would get two more bottles then I need and burst test them to see where their failiure point is. If you get one to 300psi and another only holds 100 you sure have a option less for that cannon.Lockednloaded wrote:about the camera: I don't have a proper camera to film this, but if I did I would hope the film would not be very entertaining; i don't want a huge explosion. I don't even want failure.
"Made in France"
- A spud gun insurance.
- A spud gun insurance.
- Lockednloaded
- Staff Sergeant
- Posts: 1566
- Joined: Thu Sep 03, 2009 9:38 pm
- Location: Texas, USA
- Been thanked: 6 times
the one I am going to test has minor dents and is about two months old. This is on purpose because I want to test worst case scenario
I love lamp