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What about fridge compressors?

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.
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Unread postAuthor: Brian the brain » Sat Dec 06, 2008 11:31 am

Most spudrelated accidents are because of human error, not failing pressure rated parts.

Using material past their rating can be done within a reasonable range.

I´ve put 80 bar on 15 mm copper pipe supposed to be `rated`for 6 bar.

QEV´s are rated for about 10 bar, and they hold 60.veen the rubber pistons inside!

So a 15 bar rated vessel should be just fine at 12 dontcha think?
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Unread postAuthor: psycix » Sat Dec 06, 2008 4:41 pm

jimmy101 wrote:No engineer worth a damn will ever purposely exceed the spec's of a device. Engineers don't look at "Safety margins" as just suggestions. Nor do they ever figure they can stray into the 2x (or whatever) margin built into the spec.

When pushing it to 12 bar, I am NOT exceeding any limits. Well okay, one, the 8 bar limit. But that is not a safety limit. Its a limit to increase lifetime and reliability of the machine because any higher then 8 bar is not needed.
Technically the thing should be able to handle 12 bar just fine.

Any engineer worth a damn will know that when a product is rated up to 12 bar, the product can handle 12 bar without any problems, and has been tested to do so.
The rating has a safety margin and it should not fail under the rating under normal use, as this is the responsibility of the manufacturer.
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Unread postAuthor: Brian the brain » Sun Dec 07, 2008 4:23 am

Could it be that the compressor puts out 8 bar max, áfter regulation?

That would indicate the tank normally holds more..
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Unread postAuthor: john bunsenburner » Sun Dec 07, 2008 8:10 am

I said that in an earlyer post: The max pressure is not the failing pressure but the maximum out put pressure without any modifications
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Unread postAuthor: psycix » Mon Dec 08, 2008 10:58 am

Brian the brain wrote:Could it be that the compressor puts out 8 bar max, áfter regulation?

That would indicate the tank normally holds more..

Too bad that is not the case:
There are two pressure gauges on:
One for the tank pressure and one for the regulated pressure.
And they go up to 12 bar, not 8. For some reason.
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Unread postAuthor: john bunsenburner » Mon Dec 08, 2008 2:16 pm

Only because a gauge has a limited pressure that does not mean that is the tanks failing pressure, this discussion is really pointless and i am amazed it carries on for so long!
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Unread postAuthor: psycix » Mon Dec 08, 2008 2:47 pm

I know the gauges have nothing to do with the tank, but I just wanted to notice that they are ALSO "rated" to 12 bar or more.

I think that my compressor could put out 12 bar. Safely.
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Unread postAuthor: john bunsenburner » Mon Dec 08, 2008 3:34 pm

Ok then i think we all agree! Wierd how people can sometimes jsut talk past each other...(ok i am really guilty of that to!)
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