Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 57 users online :: 6 registered, 0 hidden and 51 guests


Most users ever online was 218 on Wed Dec 07, 2016 6:58 pm

Registered users: Bing [Bot], Google [Bot], Google Adsense [Bot], MCRKilljoy, MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

2liter an 20 oz bottles

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
Sponsored 
  • Author
    Message

2liter an 20 oz bottles

Unread postAuthor: Deko » Mon Dec 18, 2006 12:01 pm

about how much psi can a 2liter or 20 oz bottle hold safely?
  • 0

User avatar
Deko
Sergeant Major
Sergeant Major
 
Posts: 190
Joined: Fri Sep 29, 2006 3:22 pm
Reputation: 0

Unread postAuthor: Recruit » Mon Dec 18, 2006 2:44 pm

100 psi I THINK not sure. ask rambo he is the authority in this.
  • 0

User avatar
Recruit
Lieutenant Colonel
Lieutenant Colonel
 
Posts: 413
Joined: Fri Oct 06, 2006 4:26 pm
Reputation: 0

Unread postAuthor: Bluetooth » Mon Dec 18, 2006 2:55 pm

Some people say they've had one burste at 30 some say they've filled them to 160. No ones really right or wrong.
  • 0

User avatar
Bluetooth
Brigadier General
Brigadier General
 
Posts: 863
Joined: Tue Jun 27, 2006 7:57 am
Reputation: 0

Unread postAuthor: Tshylea » Mon Dec 18, 2006 2:57 pm

Just fill one until it blows up, then I'd feel safe at about 30% less than that.
  • 0


Tshylea
Corporal
Corporal
 
Posts: 78
Joined: Wed Oct 18, 2006 9:22 pm
Reputation: 0

Unread postAuthor: Deko » Mon Dec 18, 2006 3:08 pm

ok thanks for your help guys
  • 0

User avatar
Deko
Sergeant Major
Sergeant Major
 
Posts: 190
Joined: Fri Sep 29, 2006 3:22 pm
Reputation: 0

Unread postAuthor: MrCrowley » Mon Dec 18, 2006 3:24 pm

mythbusters took one to 115psi i think. 60-80psi should be safe.
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Unread postAuthor: Insomniac » Mon Dec 18, 2006 3:56 pm

Well, I use a 1.5 litre sprite bottle and take it up to 80 psi, and have tested one to 100 psi, and it didnt show any signs of failing. My advice is to use only the Coke branded bottles, as they tend to be fairly thick, and pressure test them before use. Just fill it all the way to the top with water and pressurise to about 20 psi higher then you intend to use it at. If it dosen't streach or burst, it should hold air fairly safely.

Woo first post! :D
  • 0

User avatar
Insomniac
Major General
Major General
 
Posts: 1297
Joined: Mon Dec 18, 2006 3:47 pm
Location: Australia
Country: Australia (au)
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: Scope » Mon Dec 18, 2006 4:03 pm

Though this is not completely proven. Coke bottles tend to burst around 108 psi... you should be able to bring it up to 100 reliably.
  • 0

User avatar
Scope
Captain
Captain
 
Posts: 342
Joined: Fri Nov 17, 2006 10:31 pm
Location: Ct
Reputation: 0

Unread postAuthor: rna_duelers » Thu Dec 21, 2006 5:49 am

I have taken the 2 Litre bottles to 130psi without anytype of explosion,but I have had a bottle rip when I tried to have a pop in schrader valve in the bottle wall.Although an expansion in the bottle can indeed be felt when aired to 130psi but nothing major.
  • 0

Image
User avatar
rna_duelers
Major General
Major General
 
Posts: 1740
Joined: Mon Sep 26, 2005 7:07 am
Location: G-land Australia
Country: Australia (au)
Reputation: 1

Unread postAuthor: PVC Arsenal 17 » Thu Dec 21, 2006 4:40 pm

^ ^ hey when did you get here??
  • 0


PVC Arsenal 17
Major General
Major General
 
Posts: 1762
Joined: Mon Mar 27, 2006 4:18 pm
Location: United States
Reputation: 1

Unread postAuthor: CS » Thu Dec 21, 2006 5:55 pm

Wow, I love how everyone looks for these magical numbers.

Personally, I would never use a pop bottle for any component of a launcher. First because it makes your cannon look like white trash, and second because they are simply not made with any such standards in mind. Again personally, Id be scared as to take them past 60 PSI. I mean in a PVC launcher that’s when you can here the PVC start stressing noticeably. Id think going to 100PSI would only just in essence heighten your chances of a failure to a very feasible event.

As to what the burst pressure is, I don’t know. I think the only standards in which they have is to exceed the normal operating pressures, by a suitable safety factor. There not going to exceed it that much as to also factor cost into there. This <a href="http://hypertextbook.com/facts/2000/SeemaMeraj.shtml">site</a> displays a source stating that a bottle of Coca-Cola at room temperature is at 55PSI. So with 100PSI in there Id think you to by a fair amount exceed any intentions they had on what the bottle should be able to withstand in terms of internal PSI.

Say, what’s wrong with using PVC/ Metal components again? Just as to something I found funny, while it may not be as to you cause it might be true for you. Well I found a busted plastic hub cap on the side of the road, my first thought wasn’t 'how can I use this in a spud launcher!!11!!1'
  • 0

User avatar
CS
Donating Moderator
Donating Moderator
 
Posts: 1897
Joined: Fri Feb 18, 2005 5:32 pm
Location: Southern Utah
Country: United States (us)
Reputation: 4

Unread postAuthor: Insomniac » Thu Dec 21, 2006 6:02 pm

Well people have been using bottles in water rockets for years, and they havn't burst from the pressuere. And, the bottles on water rockets get put under a fair bit of stress, and they don't burst. As long as you do your own pressure test on a bottle first, I am perfectly comfortable taking one to 80 psi. I filled one with water and overpressurised it, and even though I didn't burst it, I could see the top bulging and streaching. Even though it held the pressure, you could see that it was over pressureised even before it burst.

Also, I change the bottle on my launcher regularly, so even if the rapid pressurisation then depressurisation is damaging the bottle, I throw it out well before it has a chance to become noticeable.
  • 0

User avatar
Insomniac
Major General
Major General
 
Posts: 1297
Joined: Mon Dec 18, 2006 3:47 pm
Location: Australia
Country: Australia (au)
Reputation: 0

Unread postAuthor: MrCrowley » Thu Dec 21, 2006 6:08 pm

A kid in NZ had a bottle of coke next to him in his car and he had just bought it(it was in a fridge) and after about 10min in the car for some reason it blew up giving him loads of deep cuts and had to go to the hospital. It could of been heat or a defect in the bottle but either way that doesn't sound like every coke bottle is made for such high pressures.
  • 0

User avatar
MrCrowley
Moderator
Moderator
 
Posts: 10207
Joined: Fri Jun 23, 2006 10:42 pm
Location: Auckland, New Zealand
Country: New Zealand (nz)
Reputation: 4

Unread postAuthor: judgment_arms » Thu Dec 21, 2006 6:08 pm

Coke bottles are rated to about 150psi plus they don’t frag… I once got a 2 liter coke bottle to 100psi and shot it with my pellet gun, nothing happen beyond a loud hiss and a small hole. So worst case scenario: loud pop.
  • 0

Call me "Judge", it's easier to type.

Spud gun safety rules
User avatar
judgment_arms
Major General
Major General
 
Posts: 1272
Joined: Tue Oct 17, 2006 8:49 pm
Location: Not so beautiful North Carolina, but at least it’s the U.S.A.!
Reputation: 0

Unread postAuthor: rl93 » Thu Dec 21, 2006 6:09 pm

mythbusters used 3 liter bottles
  • 0

User avatar
rl93
2nd Lieutenant
2nd Lieutenant
 
Posts: 227
Joined: Sun Jan 22, 2006 6:52 pm
Location: USA
Reputation: 0

Next

Return to Construction Materials/Ammo Discussion

Who is online

Registered users: Bing [Bot], Google [Bot], Google Adsense [Bot], MCRKilljoy, MSNbot Media, Yahoo [Bot]

Reputation System ©'