10-15x hybrid

Harness the power of precision mixtures of pressurized flammable vapor. Safety first! These are advanced potato guns - not for the beginner.
User avatar
judgment_arms
Sergeant 3
Sergeant 3
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.!

Sat Apr 26, 2008 8:37 am

POLAND_SPUD wrote:...but we no almost nothing about malleable iron fittings...
They’re made in China, are actually super low carbon recycled steel, sometimes cast so poorly they are square, and have a pressure rating of 150psi, although I wouldn’t trust them much past 60-80psi.

Think of them as black pipe’s DWV… :roll:
Call me "Judge", it's easier to type.

Spud gun safety rules
User avatar
elitesniper
Sergeant
Sergeant
Posts: 1090
Joined: Sat Oct 13, 2007 8:40 pm

Sat Apr 26, 2008 9:28 am

So you trust pvc move then black pipe? :D , anyways I think ill have to keep this at a 5x-6x mix due to my ignition witch is only a peizo, might have trouble sparking at higher mixes, I should get healthy carnage results :)
User avatar
DYI
First Sergeant 5
First Sergeant 5
Antigua & Barbuda
Posts: 2862
Joined: Sat Jul 07, 2007 8:18 pm
Location: Here and there

Sat Apr 26, 2008 10:15 am

I've used the malleable iron fittings at 500 psi, but I don't advertise that as being safe, and I have no idea how close it is to their failure point. The only one of those on my hybrid is the union, and I really don't care if that fails, as I'm getting a 3000psi one from McMaster in a few weeks anyway.

I definitely wouldn't take this hybrid to 15x unless I was a long way away from it.

And where did you get that ball valve? Even McMaster doesn't have brass ball valves rated that high.
Spudfiles' resident expert on all things that sail through the air at improbable speeds, trailing an incandescent wake of ionized air, dissociated polymers and metal oxides.
User avatar
bigbob12345
Staff Sergeant
Staff Sergeant
Posts: 1516
Joined: Sat Dec 01, 2007 9:13 am
Location: Mercer Island,Washington

Sat Apr 26, 2008 10:16 am

judgment_arms wrote:
POLAND_SPUD wrote:...but we no almost nothing about malleable iron fittings...
They’re made in China, are actually super low carbon recycled steel, sometimes cast so poorly they are square, and have a pressure rating of 150psi, although I wouldn’t trust them much past 60-80psi.

Think of them as black pipe’s DWV… :roll:

Well i take them to 350psi regularaly and im doing fine, no BOOMyet


edit DYI beat me to the malleble iron high pressure thing
User avatar
elitesniper
Sergeant
Sergeant
Posts: 1090
Joined: Sat Oct 13, 2007 8:40 pm

Sat Apr 26, 2008 10:50 am

I actually have no idea where the valve came from, my dad said he got them from a hydraulic factory place where his friend works and he just gave me like two of them since he knew I was building something that required high pressures.
I think this website I just found may be helpful about the iron fittingshttp://www.engineeringtoolbox.com/iron- ... d_855.html
User avatar
POLAND_SPUD
Captain
Captain
Posts: 5402
Joined: Sat Oct 13, 2007 4:43 pm
Been thanked: 1 time

Sat Apr 26, 2008 2:30 pm

yeah I use them all the time and I take them regulary up to 30 - 35 bar...

but still we don't know how much they can take so it would be a good idea to check it
User avatar
SpudUke5
Sergeant
Sergeant
Posts: 1099
Joined: Tue Sep 04, 2007 10:16 pm

Sat Apr 26, 2008 4:56 pm

DYI wrote:And where did you get that ball valve? Even McMaster doesn't have brass ball valves rated that high.
Well its not brass; its hydraulic carbon steel, but they are rated up to 7250 psi depending on size on mcmaster: part number 4715K15
4SPC, My 4" piston 3" porting cannon
Memo:
Fix up copper cannon
Fix up 4SPC
Start Stirrup pump
Start Toolies piston bazooka
Post Reply