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Flexible Metal Hose

Flexible Metal Hose

Flexible Metal Hose

(OP)
I'm looking for an extremely flexible, 8" metal hose, stainless steel.  I've tried the conventional convoluted metal hoses, but they just aren't flexible enough.  

I believe there are some manufacturers that make the convoluted hose from layers instead of just a single ply of metal.  Can't seem to find them on the net though.  

Hose material must be non-magnetic, so 300 series stainless or possibly a copper alloy would be acceptable.  Plastic (ie: Teflon) and rubber is not acceptable due to low temperature.

RE: Flexible Metal Hose

What are the pressure constraints?

Good luck,
Latexman

RE: Flexible Metal Hose

(OP)
Pressure ~ 10 psi
Media Helium
Temp: Cryogenic

Thanks.

RE: Flexible Metal Hose

How tight of bends are you looking for?
Or is it a cyclic loading you are looking for?
Layered convolutes will make the hose stiffer.
Normally metal convolute hoses are not that flexible, and have limited cycle life.

RE: Flexible Metal Hose

(OP)
Hose tested had 24" bend radius.  It's not the bend radius that's the problem, it's the force needed to flex this large of a hose.  I'm thinking that a hose made with multi-ply convolutions would be more flexible.   

RE: Flexible Metal Hose

Why do you thing adding more material will make it more flexible?

RE: Flexible Metal Hose

(OP)
Same material thickness, just reducing 1 ply to numerous ones.  ie: no shear stress between plies.

RE: Flexible Metal Hose

You are mistaken about the low temperature capabilities of PTFE (Teflon) hose. It is much more flexible than any metal down to -300 F. We can provide a 6" convoluted PTFE hose that will be more flexible and lighter than what you're used to, but not 8".  

RE: Flexible Metal Hose

Note that the bend radius and the stiffness are directly related.

We have a braided corrugated metal hose that is meant for low pressures like you have, with a correspondingly lower STATIC bend radius of 10.5" for 8" diameter.  Rated for 15psi at ambient temperature.  ("Static" bend is for just a handful of bends, not constant bending, which is called "dynamic".)

The more standard of our metal hoses are for higher pressures.

www.flexicraft.com

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