Looking to see if anyone has any experience with using PTFE-lined braided stainless hosing as process hoses for a heating circulator–vs. corrugated-steel-lined, braided stainless hosing?
here’s the application:
I’ll be using a Julabo, circulating silicon oil at a temp of 200C through the jacket of a SS reactor. I’m sourcing process hoses for this (1/2in. ID), and find that the standard PTFE-lined version has a heat tolerance of 204C–just 4C above my high-temp range, which is too close for comfort.
(LINK FOR EXAMPLE)
I’ve found some braided steel hoses lined with corrugated stainless (effectively like vacuum bellows), that have a heat tolerance of 648C–MUCH more comfortable with this heat range, BUT, i’m concerned that the corrugation will cause turbulence and thus complicate the flow of heating oil through the hoses.
(LINK FOR EXAMPLE)
does anyone have experience with flow using these corrugated style hoses for a similar process? thanks!
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You hit the nail on the head. Clean flow for PTFE, vs best possible temperature resistance for SS (also, cheaper). For heating fluid though, I see no issue with just using the corrugated.
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We use corrugated 316L SS tube with a braided 316 SS outer jacket with our oil heaters. We run one of our heaters at 240C and never had a problem with flow. The full SS hose allows for custom welded connections, which is nice.
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We use 2 inch corrugated stainless hoses on our Behemoth extraction system. Haven’t really noticed any issues with them thus far, its been a couple years. Typically we see about 30 lbs per minute of solvent flow.
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Flow concerns are a non issue. Look up “laminar flow” in fluid dynamics if you want to know more.
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Nothing new there… well aware of laminar flow issues. Have made the largest hydrocarbon extraction system for the past couple of years and to this date we still have the largest and fastest unit on the market. 
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