Date: Mon Mar 16 13:50:48 2009 Back to Contents ------------------------------------------------------------------------

Author: David Maiullo

Subject: Re: Ruben's tube and propane



Mine is also a 4" ID tube. I actually light the flames from the gas
input side as it's filling, then pass the lighter back and forth over
the top of the holes along the tube as it fills so as the gas fills the
tube and leaves the holes they light. I haven't had a problem yet.

Dave wrote:
> Dave,
> What's the diameter of your tube? Mine is 4 in. ID and it's 10 feet
> long. That means that there will be a few cu ft of propane in it. I
> presume it will need to be filled before lighting the flames, and I am
> a bit concerned about having all that gas under the flames. I use a
> dental dam to seal the speaker end of the pipe so I think that it
> could be carried outside to empty the unused gas.
> Cliff
> Quoting David Maiullo :
>> Hi Cliff,
>> Dale is correct in his description of how well propane works in the
>> Reuben's tube. I actually don't know how many places I've used the
>> Reuben's tube. In bars, libraries, schools, gyms, and outside (!) demo
>> shows, all with many different air currents and winds. If you are
>> really worried about the air movement, just make a sturdy plexi shield
>> to stand one foot back and around the sides of the tube. I made one
>> when I first built the tube 20 years ago, but I never actually need it
>> so I don't use it. You sometimes need to finely regulate the gas flow
>> yourself to make the wave forms visible, and this will vary as you go
>> from low frequency to higher frequency standing waves, but you quickly
>> learn how to do that when you are using it.
>> McMaster-Carr is a great place to purchase a 5 lb propane tank to use
>> in shows and in classrooms. Since so many schools are taking natural
>> gas out of the classroom for insurance and safety purposes, having your
>> own tank guarantees you can perform the demo where and whenever you
>> want and need to.
>> BTW, my tube has size .04" holes, or 1.016mm, spaced every half inch
>> for 72". This seems to work pretty well.
>> Happy gas tubing,
>> Dave/RU
>> Dale E. Stille wrote:
>>> Cliff,
>>> Zig and Dave Maiullo both run their tubes off propane using small 7
>>> to 10 lb tanks with the standard pressure regulators. While you
>>> need different orfices for things like stoves and water heaters for
>>> the different gasses, I think you will find that the Rueben's tube
>>> is pretty forgiving in this regard. So, you should be able to use
>>> it with either gas. I would suggest getting the quick couplers
>>> for ease of attaching the tank to the tube. ( They look and act
>>> the same as the couplers for high pressure air hoses).
>>> Later,
>>> Dale
>>> wrote:
>>>> One of our faculty wants to use my Ruben's tube as part of a road
>>>> show to a high school. The school does not have a natural gas
>>>> source for him so he wants to rent a propane tank to fuel the
>>>> tube. I am concerned about: how well this will work, as I seem to
>>>> remember that propane requires different sized orifices for flame
>>>> jets than natural gas, safety (a tank of gas under pressure near
>>>> an open flame in front of a large audience) and finally, in our
>>>> lecture hall use, I find I have to turn off our air handlers to
>>>> reduce air currents in the room so the flames are stable.
>>>> So I was wondering if any of you had experience using the Ruben's
>>>> tube on the road in such circumstances and had any advice for me
>>>> to pass along.
>>>> Cliff

From Mon Mar 16 13:50:48 2009