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| STHORNE |
 Posted: 03/11/2008 18:13 PM Post subject: |
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Master of Spuds
Joined: 14 Feb 2007
Posts: 1170
500.99 Spud Bux
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| its a price we all have to pay my friend (if you own a hybrid that is) |
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| SpudFarm |
| Posted: 03/11/2008 18:18 PM Post subject: |
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Hybrid Guy
Joined: 04 Nov 2006
Posts: 2049
1076.01 Spud Bux
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_Fnord i thinking of getting a pipe the size of the burst disks and just put them in a hydraulic press and make like 1000 at 5seconds  |
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| _Fnord |
| Posted: 03/11/2008 18:22 PM Post subject: |
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reenigne
Joined: 13 Feb 2007
Posts: 1198
1699.58 Spud Bux
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That's not a bad idea actually.
| Quote: | its a price we all have to pay my friend (if you own a hybrid that is)
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Not me. I'm above the law! Muahaha.
I just have to fix crap that breaks due to ridiculous mechanical stresses. |
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| bigbob12345 |
| Posted: 03/11/2008 18:27 PM Post subject: |
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Experienced n00b
Joined: 01 Dec 2007
Posts: 1516
370.57 Spud Bux
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| sthorne wrote: | | its a price we all have to pay my friend (if you own a hybrid that is) |
Or a burst disk pnumatic
And spudfarm I actually really like that idea but I would use a vice instead and clamp it down as hard as I can. |
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| SpudFarm |
| Posted: 03/11/2008 18:29 PM Post subject: |
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Hybrid Guy
Joined: 04 Nov 2006
Posts: 2049
1076.01 Spud Bux
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i got a 10ton hydraulic press so clamping power = no problem  |
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| STHORNE |
| Posted: 03/11/2008 18:40 PM Post subject: |
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Master of Spuds
Joined: 14 Feb 2007
Posts: 1170
500.99 Spud Bux
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| bigbob12345 wrote: | | sthorne wrote: | | its a price we all have to pay my friend (if you own a hybrid that is) |
Or a burst disk pnumatic |
or that. and technically, wouldn't a "burst disk pneumatic" just be an advanced pneumatic? |
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| DYI |
| Posted: 03/11/2008 19:59 PM Post subject: |
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Rear Brigadier
Joined: 07 Jul 2007
Posts: 2217
1326.93 Spud Bux
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| Quote: | Um, you use unrated abs at 500 psi
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 Well, make that 50 times the rated pressure... I'm pretty sure that I significantly exceed the burst pressure of the barrel pipes, it's amazing how long they've survived, even in subzero temperatures with heavy (and often completely jammed  ) ammo.
| Quote: | and technically, wouldn't a "burst disk pneumatic" just be an advanced pneumatic?
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No. When you're talking about a pneumatic, the valve is the defining component, and a lot of valves fall into the so-called "advanced" category, anything homemade really. |
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| SpudBlaster15 |
| Posted: 03/11/2008 20:18 PM Post subject: |
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Human blast shield
Joined: 18 Oct 2006
Posts: 1539
11.03 Spud Bux
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DYI, 2" nominal diameter Sch 40 DWV ABS pipe should (assuming no molding defects) have a burst pressure of around 1000PSI, so I am not surprised that it resists <500PSI for only a few tens of milliseconds.
I surely wouldn't use it as the barrel of a 10x mix hybrid launcher though. |
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| DYI |
| Posted: 03/12/2008 10:09 AM Post subject: |
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Rear Brigadier
Joined: 07 Jul 2007
Posts: 2217
1326.93 Spud Bux
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| Quote: | DYI, 2" nominal diameter Sch 40 DWV ABS pipe should (assuming no molding defects) have a burst pressure of around 1000PSI, so I am not surprised that it resists <500PSI for only a few tens of milliseconds.
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Well that's certainly good to know. I'd always assumed it was lower, with all the talk of it bursting at around 150 psi... I guess just another unbased assumption like the whole "mixes over 4x risk detonation" thing. What's the burst pressure of 4" SCH 40 ABS? I may not have to reinforce that barrel after all...
And I'm using DWV copper for the barrel on my hybrid, so no worries there (I hope). |
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| SpudFarm |
| Posted: 03/12/2008 11:45 AM Post subject: |
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Hybrid Guy
Joined: 04 Nov 2006
Posts: 2049
1076.01 Spud Bux
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no DYI i also use some really thin walled copper for my hybrid and it is fine
BTW with your hybrid are you thinking to go up to like 10x ? |
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| DYI |
| Posted: 03/12/2008 17:26 PM Post subject: |
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Rear Brigadier
Joined: 07 Jul 2007
Posts: 2217
1326.93 Spud Bux
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| The goal for my hybrid is 10x air/MAPP. After hydrostatic testing to 1500 psig, 10x will be the normal operating mix. Due to the nature of my meter, I don't expect that fueling will be incredibly accurate below 4x or so, and I see no real reason to use anything other than full power, except maybe for shooting in my yard. |
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| SpudBlaster15 |
| Posted: 03/12/2008 17:28 PM Post subject: |
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Human blast shield
Joined: 18 Oct 2006
Posts: 1539
11.03 Spud Bux
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| Burst pressures really are a lot more complex than what a simple formula can model, but assuming no molding defects, 4" nominal diameter ABS pipe should have a burst pressure of somewhere around 800PSI. However, because molding defects are likely in DWV pipe, I wouldn't subject it to any pressure levels greater than half of that figure. |
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| DYI |
| Posted: 03/12/2008 17:41 PM Post subject: |
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Rear Brigadier
Joined: 07 Jul 2007
Posts: 2217
1326.93 Spud Bux
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| Thanks. I'll probably reinforce it anyway, because I don't want to risk accidentally bursting a $90 chunk of pipe. |
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| SpudFarm |
| Posted: 03/13/2008 12:34 PM Post subject: |
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Hybrid Guy
Joined: 04 Nov 2006
Posts: 2049
1076.01 Spud Bux
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whhhoa 10x 
you should get to mach two 
my goal for all of my cannons/hybrids is SOS.
a GB at the speed of sound should be interesting... |
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