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 85 users online :: 5 registered, 0 hidden and 80 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

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

The Team
Administrators
Global Moderators
global_moderators.png CS

Imploding barrel?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
Sponsored 
  • Author
    Message

Imploding barrel?

Unread postAuthor: dudeman508 » Mon Jun 15, 2009 10:26 pm

My next project is a high pressure co-ax. My chamber will be galvanized steel, but my barrel will be pvc. At 300psi is there any chance of my barrel imploding. Thanks in advance!
  • 0

User avatar
dudeman508
2nd Lieutenant
2nd Lieutenant
 
Posts: 237
Joined: Thu Jul 03, 2008 9:19 pm
Reputation: 0

Unread postAuthor: far_cry » Mon Jun 15, 2009 10:32 pm

how much the thickness of the pvc barrel ?
  • 0

ImageImage
User avatar
far_cry
Donating Member
Donating Member
 
Posts: 317
Joined: Wed Aug 20, 2008 3:59 pm
Reputation: 0

Unread postAuthor: Moonbogg » Mon Jun 15, 2009 11:54 pm

Details please! What size pipes and thickness etc.
  • 0

User avatar
Moonbogg
Major General
Major General
 
Posts: 1375
Joined: Mon Oct 13, 2008 10:20 pm
Location: whittier, CA USA
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Tue Jun 16, 2009 12:16 am

Highly unlikely, tubes tend to be much stronger when subjected to external pressure. I've used unrated 20mm PVC electrical conduit as a barrel in a coaxial at 400 psi and never had even a hint of failure.
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: Technician1002 » Tue Jun 16, 2009 1:13 am

I haven't done 300 PSI so this may not apply, but 2 inch cellular core ABS DWV takes 100 PSI just fine. Same with sched 40 1 inch PVC.

The test of the ABS is covered in my Celluar core ABS test thread. The 1 inch was tested in my Mouse Musket, a 1 inch coax. Sorry I don't have tests at higher pressure.
  • 0

User avatar
Technician1002
Chief of Staff
Chief of Staff
 
Posts: 5190
Joined: Sat Apr 04, 2009 11:10 am
Reputation: 14

Unread postAuthor: starman » Tue Jun 16, 2009 1:44 am

Assuming you'll have equal pressure on all sides of the barrel (yes), the pipe will hold at least the rated pressure if not significantly more.

Even so, if for some reason it did fail inside the chamber, it would experience a fairly "controlled" decompression out of the barrel.
  • 0

User avatar
starman
Donating Moderator
Donating Moderator
 
Posts: 3041
Joined: Wed Dec 12, 2007 12:45 am
Location: Simpsonville, SC
Reputation: 0

Unread postAuthor: CpTn_lAw » Tue Jun 16, 2009 5:05 am

The circular shape of the section subjet to pressure gives it strength, it has been know for centuries now, in construction manner, an ogival or circular handle can hold tremedous amounts of weight.

So I guess you'll be fine, and remember, if you always follow safety rules about your guns, there should be no, or very minimal problems if something were to fail. Point your gun in a safe direction when you pressurize is, and perform some pressure testing before you actually use it. As a matter of fact, the motion the projectile will take when forces apply to it will undoubtly deform the barrel by a small amount, making it more likely to fail. So, test it and be safe ^^
  • 0

"J'mets mes pieds où j'veux, et c'est souvent dans la gueule."
User avatar
CpTn_lAw
Brigadier General
Brigadier General
 
Posts: 987
Joined: Sun Sep 11, 2005 9:10 am
Location: France
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: psycix » Tue Jun 16, 2009 5:43 am

Proper PVC will most likely stand up to a lot of external pressure.
However, I do remember to have seen one or two cannons which did implode the barrel.
Good supports may help. If the barrel goes bending/vibrating it will go wrong faster.
  • 0

Till the day I'm dieing, I'll keep them spuddies flying, 'cause I can!

Spudfiles steam group, join!
User avatar
psycix
Donating Member
Donating Member
 
Posts: 3684
Joined: Mon Jun 25, 2007 7:12 am
Location: The Netherlands
Reputation: 0

Unread postAuthor: dudeman508 » Tue Jun 16, 2009 10:09 pm

Ok, thanks guys thats all i needed to know. :D :D :D
  • 0

User avatar
dudeman508
2nd Lieutenant
2nd Lieutenant
 
Posts: 237
Joined: Thu Jul 03, 2008 9:19 pm
Reputation: 0

Return to Pneumatic Cannon Discussion

Who is online

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

Reputation System ©'