SpudFiles

Ok,the people on this site have been bothering me about this.

I have pressure tested 2in cellular core abs up to 85 psi. (sch 40)
I have used cellular core 3 in and 2 in abs in a combustion.(sch 40)
I have tested sch 40 pressure rated pvc up to 140 psi in 120 degree weather.
They work fine.
I dont reccomend abs in pneumatics.

I have tryed clamp in style schrader valves and snap in.
The results: Clamp in work without fail and are more reliable.
Snap in tire valves are less reliable. made of rubber with a chrome sleeve.
Clamp in tire valves are all metal with a rubber bulb, and have a tightening nut on top.

I did a hammer test with brand new abs and pvc. both sch 40.(2 in)

So those of you who say abs sucks or pvc sucks. Both have their strenghts and weaknesses.

For me personally. Pvc for pneumatics. Abs or pvc for combustion.
The ultimate solution: Sleeve your pvc with abs for added protection in case of drops or bursts.

2" cellular core abs to 85 psi? Doesn' seem likely to me. Are you sure it was cellular core and not just dwv?

You..........are............retarded!
Never ever pressure test cell core.

Not nessecarilly retarded. He could have done it safely. Especially because it was abs and not pvc. No big shards flying at your face.

Hmm,I think it was cellular core. Im not with my garage right now so I cant check right now but I will check tonight.

benstern wrote:You..........are............retarded!
Never ever pressure test cell core.

No I am not retarded. I tested it in a steel box. If it did break, I am perfectly fine. I tested it so you dont have to. Like I said. I dont recommend it for pneumatic. Actually just dont use it for pneumatic at all.

Frick'. Act more mature on this forum by not resulting to tossing insults like "you are retarded". K he might be wrong, but we cant even discuss spud related subjects because we get caught up in these little playground fights. For the love of god, please stop!

That aside. frankrede, to better your testing possibly you could leave these vessels charged for long periods of time to see if the time would degrade the integrity of the vessel. Also subjecting the vessels to dropping and such to see there effects. If this could be documented and presented in both a nice and sceintific way such infromation could be very useful. I dont particularly like the hammer test since its not going to expericence that under normal conditions, its better to replicate possible means of failure such as dropping on different terrains (concrete, dirt, grass, wood, etc). If your intrested ill try to think of some tests, and better define there perimeters. Also thanks for the testing so far.

We all know that pipes are made with huge safety factors, since a flaw in manufacturing could lessen the integrity, so they protect there self by issueing a max pressure way beyond the bursting pressure. It is also to compensate for such things as time, the sun, etc. Id belive such testing shouldnt be used to determine if you can use ABS for your pneumatic, rather to see what safety factors we are working off, to better determine and compensate for things such as DDT or whatever...

Instead of relying on a steel box, just fill the things with water.

ABS may take pressure just fine, but it would never stand long against a piston. So NEVER use ABS in a piston cannon.

Also test them at different temperatures!

Gort: ABS may take pressure just fine, but it would never stand long against a piston. So NEVER use ABS in a piston cannon.



Ok, if abs took the pressure fine like you said, it would be perfectly fine to use for a piston cannon. PVC is very brittle and can break very easily, ABS is flexible and has a very high tensile strength, It can handle powerful impacts a heck of a lot better than pvc can.[/quote]

boilingleadbath wrote:Instead of relying on a steel box, just fill the things with water.

COuld you explain that a bit better?

sgort87 wrote:ABS may take pressure just fine, but it would never stand long against a piston. So NEVER use ABS in a piston cannon.

Just don't use abs in a pneumatic. Or use it only as a sleeve.

dan116 wrote:Gort: ABS may take pressure just fine, but it would never stand long against a piston. So NEVER use ABS in a piston cannon.



Ok, if abs took the pressure fine like you said, it would be perfectly fine to use for a piston cannon. PVC is very brittle and can break very easily, ABS is flexible and has a very high tensile strength, It can handle powerful impacts a heck of a lot better than pvc can.

[/quote]
Eeek! Just don't use abs in pneumatics. If you must use it use itl like a sleeve for superior protection.

"boilingleadbath wrote:
Instead of relying on a steel box, just fill the things with water.

COuld you explain that a bit better?"

He means that if you fill the chamber with water and then pressurize it there is less energy to be released if the chamber was to fail. Pressurized air holds more energy than water.