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Coiled Pipe

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Coiled Pipe

Unread postAuthor: DYI » Wed Aug 08, 2007 12:06 pm

McMaster sells coiled steel (or SS, or brass) pipe that is used to protect gauges from steam.

I think that these work by putting water in the coil. As the steam pushes up the incompressible water, the water compresses the air above it, giving a fairly accurate reading on the gauge.

I was thinking of making a homemade version to protect a gauge in a steam gun that I am making, and was wondering if this is actually how they work, or if there is something more complicated involved. IF I am correct, they could be easily replicated with standard pipe and fittings. Ordering from McMaster is not an option for me.
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Unread postAuthor: potatoflinger » Wed Aug 08, 2007 12:15 pm

I don't know how they work, but your explanation sounds like it could work pretty well.
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Unread postAuthor: jasonsmithmyer » Thu Aug 09, 2007 2:37 pm

If i'm thinking of the thing that you are talking about, we commonly call them a 'pig tail.' what they do is form a water trap that protects the 'pressure-trol' against positive and negative pressure surges. A pressure-trol is just the name we call the little device that measures the internal pressure of a steam system. you could easily replicate this with stanadard pipe to get the same effect though, i think the ones you would buy would be engineered to have the correct trap weir<sp>.

hope that helps
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Unread postAuthor: DYI » Thu Aug 09, 2007 9:50 pm

I built one yesterday and tried it today. Despite the fact that it takes an ungodly amount of time to get to 100 psi (I need more fire :twisted: ), the gauge is fine. Only time will tell whether the gauge is actually being protected by the water in the coil.

trap weir

I have no clue what that means.
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Unread postAuthor: CannonCreator » Sun Aug 12, 2007 3:57 pm

Make a prototype with pvc, but use the gauge, and the coil, put in the water, and steam, if that works, it will definatly work on a steam gun.
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Unread postAuthor: Pete Zaria » Sun Aug 12, 2007 4:01 pm

CannonCreator wrote:Make a prototype with pvc, but use the gauge, and the coil, put in the water, and steam, if that works, it will definatly work on a steam gun.


Somehow putting steam (which is very hot, and under significant pressure) in plastic pipe seems to me like it's been done before.... oh yeah! we call that a pipe bomb.

PVC (and ABS) get weaker with higher temperatures. Putting hot, high-pressure gas in plastic pipe is just asking for trouble.

@ DYI, I think that'll work just fine.

Peace,
Pete Zaria.
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