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 56 users online :: 4 registered, 0 hidden and 52 guests


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

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

The Team
Administrators
Global Moderators
global_moderators.png CS

ABS cannon explosion

A place to ask general spud cannon related questions.
Sponsored 
  • Author
    Message

Unread postAuthor: joannaardway » Thu Jun 14, 2007 9:29 am

jimmy101 wrote: Uh, joannaardway, I think you have your metals mixed up. Copper and aluminum oxides will both protect the un-oxidized metal below the oxide layer. Iron (and steel) oxide do not, they flake off, though a good stainless steel oxidizes and flakes very slowly.

Whoops. My mistake.

The point about steam locomotives still stands though - if those will last as long as they do, then a hybrid will last as least as long if properly maintained.
  • 0

Novacastrian: How about use whatever the heck you can get your hands on?
frankrede: Well then I guess it won't matter when you decide to drink bleach because your out of kool-aid.
...I'm sorry, but that made my year.
User avatar
joannaardway
Brigadier General
Brigadier General
 
Posts: 949
Joined: Mon Oct 09, 2006 4:57 pm
Location: SW Hertfordshire, England, UK.
Reputation: 0

Unread postAuthor: TurboSuper » Thu Jun 14, 2007 10:52 am

Water vapour will hardly do anything to galvanized metal. You'd need to leave your gun in a moisture-rich environment for long periods of time before you see anything happen.
  • 0

Last edited by TurboSuper on Thu Jun 14, 2007 4:38 pm, edited 1 time in total.
"If at first you dont succeed, then skydiving is not for you" - Darwin Awards

TurboSuper
Brigadier General
Brigadier General
 
Posts: 986
Joined: Thu Jun 16, 2005 1:44 pm
Reputation: 0

Unread postAuthor: BC Pneumatics » Thu Jun 14, 2007 4:32 pm

joannaardway wrote:The point about steam locomotives still stands though - if those will last as long as they do, then a hybrid will last as least as long if properly maintained.


Yes, but steam engines are well oiled, and I have even read about newer/restored ones having an epoxy coating applied. Where is Eric? Surely he can types us a book on the preventive maintenance of steam engines...
  • 0

<a href="http://www.bcarms.com/"><img src="http://www.bcarms.com/images/store_logo.png" border="0"> </a>
User avatar
BC Pneumatics
Donating Member
Donating Member
 
Posts: 1089
Joined: Tue Jan 18, 2005 6:55 pm
Location: Fresno, CA
Reputation: 0

Unread postAuthor: Kenny_McCormic » Thu Jun 14, 2007 7:39 pm

_Fnord wrote:Heh.. well, I was going to give my abs combustion a nice paintjob, but I guess I wont bother now.
I'll just post it the way it is sometime soon.

Were there any unusual variables (projectile type, low/high temp)
How many shots did you fire (total) before it failed?

Unrelated story: There's an abandon campsite about a mile away from my house in the middle of the woods. I was looking around there once and found a pvc combustion cannon hidden in the leaves. Aside from using primer, whoever built it was an idiot. The cb was something like .3:1, and half the fittings were dwv. Upon closer inspection of the vent plug, I found that it had exploded and someone had epoxied it back together.
I just left it there. Maybe someday the guy will return and attempt to shoot it again.


oxy acetlyne and remote firing sjould make a nice boom
  • 0


Kenny_McCormic
1st Lieutenant
1st Lieutenant
 
Posts: 283
Joined: Wed Jan 03, 2007 8:59 pm
Reputation: 0

Unread postAuthor: Bubba05 » Thu Jun 14, 2007 8:10 pm

Thats a bit insane to reapir a exploded cb? just get a new one and graft it into the old barrel. Ive had to do that once!!

Bubba
  • 0

User avatar
Bubba05
Colonel
Colonel
 
Posts: 518
Joined: Wed Mar 21, 2007 9:05 am
Reputation: 0

Unread postAuthor: joannaardway » Fri Jun 15, 2007 2:06 pm

BC Pneumatics wrote:Yes, but steam engines are well oiled, and I have even read about newer/restored ones having an epoxy coating applied. Where is Eric? Surely he can types us a book on the preventive maintenance of steam engines...

The inside of the boiler certainly wouldn't be oiled, and that's where you've got all of your high pressure steam.
The newer ones might be epoxy coated, but they didn't have that back 100 years ago, and they didn't explode back then because of the lack of it.

I don't believe there is any undue risk to a steel hybrid - and certainly not more than a PVC one.
If anyone's really worried about it, then there are two suggestions:
1) Use a aluminium, or a suitable aluminium alloy.
2) Don't build a hybrid.

In the end, it's the choice of each individual builder what risks they're willing to take.
  • 0

Novacastrian: How about use whatever the heck you can get your hands on?
frankrede: Well then I guess it won't matter when you decide to drink bleach because your out of kool-aid.
...I'm sorry, but that made my year.
User avatar
joannaardway
Brigadier General
Brigadier General
 
Posts: 949
Joined: Mon Oct 09, 2006 4:57 pm
Location: SW Hertfordshire, England, UK.
Reputation: 0

Unread postAuthor: BC Pneumatics » Fri Jun 15, 2007 6:10 pm

Perhaps you missed it Joanna, but I already mentioned that steel is certainly much safer than PVC or (rated) ABS.
  • 0

<a href="http://www.bcarms.com/"><img src="http://www.bcarms.com/images/store_logo.png" border="0"> </a>
User avatar
BC Pneumatics
Donating Member
Donating Member
 
Posts: 1089
Joined: Tue Jan 18, 2005 6:55 pm
Location: Fresno, CA
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: MisterSteve124 » Fri Jun 15, 2007 9:50 pm

Lol OMFG I never thought the day would come where Spudblaster would say don't use abs! I remember all the arguements about no abs is absolutely fine for a combustion! But I won't say I told you so. :lol:
  • 0

User avatar
MisterSteve124
Colonel
Colonel
 
Posts: 702
Joined: Sat Feb 11, 2006 10:11 pm
Location: West Chester, PA
Reputation: 0

Unread postAuthor: SpudBlaster15 » Fri Jun 15, 2007 11:07 pm

My basic ABS combustions have never failed, so I still feel it is an acceptable material for constructing such launchers. However, I think propane users should be weary of using ABS to construct their launchers.
  • 0

People should not be afraid of their governments. Governments should be afraid of their people.
User avatar
SpudBlaster15
Major General
Major General
 
Posts: 2385
Joined: Wed Oct 18, 2006 11:12 pm
Location: Canada
Country: Poland (pl)
Reputation: 3

Unread postAuthor: TurboSuper » Sat Jun 16, 2007 4:59 pm

I dunno about you guys, but the only thing I can actually get is DWV ABS, so thats what I roll with (I can also get galvanized steel, but it's too narrow for a combustion). Getting pressure-rated PVC here is a major PITA, the guy there didn't know what a cap was...sigh...
  • 0

"If at first you dont succeed, then skydiving is not for you" - Darwin Awards

TurboSuper
Brigadier General
Brigadier General
 
Posts: 986
Joined: Thu Jun 16, 2005 1:44 pm
Reputation: 0

Unread postAuthor: nuclearspud » Sat Jun 16, 2007 7:54 pm

ABS is a very unreliable material in the plumbing world. Because it is made with a cellular foam core, the molecules aren't as dense as PVC. Hence, ABS stands for Acrylonitrile Butadiene Styrene, note the STYRENE part. In fact, most codes now restrict the use of it.
  • 0

User avatar
nuclearspud
Private First Class
Private First Class
 
Posts: 36
Joined: Thu Feb 15, 2007 8:38 am
Reputation: 0

Unread postAuthor: hi » Sat Jun 16, 2007 7:57 pm

@ nuclearspud-

try putting pvc into the sewer.

it is very durable and much stronger than pvc in the cold. it is also less brittle.

this cannon simply cracked, pvc would have exploded.

both have their advantages.
  • 0

"physics, gravity, and law enforcement are the only things that prevent me from operating at my full potential" - not sure, but i like the quote

you know you are not an engineer if you have to remind yourself "left loosy righty tighty"
User avatar
hi
Major General
Major General
 
Posts: 1619
Joined: Thu Feb 01, 2007 9:28 pm
Reputation: 0

Unread postAuthor: nuclearspud » Sat Jun 16, 2007 8:00 pm

What do you mean put PVC in the sewer?

Merged:

PVC would not have exploded anyway. It has a way higher pressure rating and it is used in small sewer applications. Yes, i see how both have advantages, but I just think PVC has more.
  • 0

User avatar
nuclearspud
Private First Class
Private First Class
 
Posts: 36
Joined: Thu Feb 15, 2007 8:38 am
Reputation: 0

Unread postAuthor: TurboSuper » Sat Jun 16, 2007 9:08 pm

...and some codes are restricting PVC, because cutting it produces PVC dust, which is hazardous.

ABS is also much more elastic than PVC, and that seems like a good thing since surviving combustion is mostly a matter of shock absorbtion.
  • 0

"If at first you dont succeed, then skydiving is not for you" - Darwin Awards

TurboSuper
Brigadier General
Brigadier General
 
Posts: 986
Joined: Thu Jun 16, 2005 1:44 pm
Reputation: 0

Unread postAuthor: Bubba05 » Sat Jun 16, 2007 9:28 pm

In Australia ABS is only used for low pressure reticulation set ups! Thats why id never use it in a cannon at all plus it's tooooo small!
I agree with spudblaster theres not a hope in hell thats someone building a propane injected cannon out of it and living to tell the tail.

Bubba
  • 0

User avatar
Bubba05
Colonel
Colonel
 
Posts: 518
Joined: Wed Mar 21, 2007 9:05 am
Reputation: 0

PreviousNext

Return to General Spud Cannon Related

Who is online

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

Reputation System ©'