View Full Version : Hose in a hose

12-06-2010, 04:14 AM
Is there such a thing. Have an idea which requires a hose in a hose to carry air and a liquid. The liquid is paint. Want one hose, preferebly coiled, very light weight and with a bit of modification with a couple of fitting be able to supply air and paint to a small gun for stencil work. Gun is gravity feed.


Ian B
12-06-2010, 05:15 AM
Not quite a hose within a hose, but may give the same effect:



12-06-2010, 05:32 AM
A nice idea but the problem is the ends, it would need special fittings in that one of the feeds has to pass through.
I had a similar thought to feed het water to the workshop for heat but gave up on the idea due to expansion problems etc.


12-06-2010, 05:35 AM
Thanks for the link but that's much too heavy. This may be what I need.

The Nylon 11 Twin Hose.

http://www.google.com.au/url?sa=t&source=web&cd=1&ved=0CB4QFjAA&url=http%3A%2F%2Fwww.cmafh.com%2FWebsiteCatalogs%2 FVendorCatalogs%2FPneumatic%2FFreelin%2520Wade%252 0-%2520Plastic%2520Tubing%2FFreelin%2520Wade%2520Tub ing%2FFreelin-Wade%2520NylonCoils.pdf&rct=j&q=Nylon%2011%20self%20storing%20twin%20hose&ei=Gbz8TMzJNIzqrQedv_2bCA&usg=AFQjCNF1hAt-JqfrgsQoyTVqGPjvvxmEsA&cad=rja


12-06-2010, 08:25 AM
I am curious why you need one hose within the other. Is there a reason why two hoses would not work? I'm also not sure how you plan to supply paint to a gravity fed cup. Will you have a valve at the cup that you can open to refill?


12-06-2010, 08:41 AM
There are hoses made for pressure washers with the soap hose inside the water hose. I think that they are avaliable from the Surplus Center. I have been think about making something like this for a mister. If the pressure is not to high the seal can be an epoxy cast.

12-06-2010, 09:06 PM
You might look into (or search) for coaxial tubing. We use electropolished coaxial tubing in the semiconductor industry all the time, as well as coaxial plastics for the chemical distribution systems.


12-06-2010, 09:24 PM
This is probably not helpful, but my G&E shaper uses a hose-within-a-hose to deliver lubricating oil to the apron and to return the overflow to the sump. The inner hose carries the pressure feed; the outer hose carries the gravity return. Works fine and reduces the number of exposed hoses waiting to be cut or crushed.

12-06-2010, 10:15 PM
A Tig (GTAW) welder water cooled torch cable is designed to circulate coolant through the cable and transfer shielding gas to the torch head.


12-07-2010, 07:45 AM
The lube systems we sometimes install on customers bandsaw use the hose with a hose. They are just a small nylon hose inside a larger pvc reinforced hose. There are special barbs at the ends for connection to the mist pump.

12-07-2010, 08:03 AM
A Tig (GTAW) welder water cooled torch cable is designed to circulate coolant through the cable and transfer shielding gas to the torch head.

.... in three separate hoses. Gas, coolant in and coolant out.

12-07-2010, 12:26 PM
The "pipe in a pipe" concept has been used for years in the counter flow heat exchanger. Two pipes are mounted, one inside of the the other. The inside pipe has hot liquid or steam and the outer pipe the liquid to be heated. The flow of the fluids is such that the heat transfer is maximized.

Jim Caudill
12-07-2010, 04:49 PM
At my car wash, I have a fragrance machine with 3 different fragrances. The hose looks like it is a 3/8" wire-braided hose (for durability only) and has 3 small 1/8" nylon tubes inside. The little fittings are readily available to hook up the individual lines. You could easily make your own from suppliers such as McMaster-Carr.

Similarly, I have a carpet cleaner that uses the same external hose, but has only 2 inside lines: 1 for soap product and 1 for air. A toggle switch on the handle controls a relay inside the machine that controls the flow of air & soap (makes a foaming cleanser).

I think making your own will probably be the simplest route. The hoses used on liquid cooled TIG torches can be extremely light and flexible, if you get the ones for low-amperage torches.