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Old 12-02-2011, 03:56 AM   #1
thelorax121
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Default Ideas for sight glass material using hose barbs?

I am in the design stage of making a few kettles with all sanitary fittings. The current idea I am working on is the sight glass for the HLT and BK. My plan is to use 90 degree hose barb tri-clover adapter like this:



attached to a ferrule low on the side of the kettle. Some kind of plastic tubing would be connected to the hose barb and run vertically up the side of the kettle and gallon graduations added. My question is, does anyone know what kind of plastic I could use for this design? It needs to be clear, safe at boiling temperatures, and compatible with a hose barb to keep the sanitary design. Would a tin polycarbonate tube work or would that still be too stiff?

I know Sabco uses a similar design for their sight glasses, but they have not responded to my email asking them what they use

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Old 12-02-2011, 05:18 AM   #2
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Polycarb is going to be way too stiff to use directly on the hose barb I suspect.

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Old 12-02-2011, 06:00 AM   #3
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could you use a tap and die set to get em to mate up?

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Old 12-02-2011, 06:46 AM   #4
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If you are going to use barbs, then you should use Silicon hose, stretched tight with another barb on top. It is not clear, however, you can still see fluid levels.

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Old 12-02-2011, 06:55 AM   #5
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I figured polycarb would be too stiff for a barb...as for the tap and die, I am trying to avoid threads just for ease of cleaning and replacing. I spent about and hour and a half on mcmaster trying to find something similar to the Sabco material and came up empty handed :/

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Old 12-02-2011, 07:10 AM   #6
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Polycarbonate is super cheap. I say buy a length for a couple bucks, and try heating it to fit over the barbs. It softens pretty easily, so if you could gently heat it without burning it, (heat gun? hair dryer? a hot oil bath?) you should be able to push it on. It needs about 150*C to 200*C to soften without melting....Not sure if a hair dryer held super close will hit that, but a deep fryer with some oil in it would....

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Old 12-02-2011, 09:34 AM   #7
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Heating polycarb might get it over the barb but it will cool and be too rigid to get off the barb for cleaning, if that's the intention.
Could you use polycarb and a short piece of silicon hose over both the barb and the polycarb tube?

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Old 12-02-2011, 09:41 AM   #8
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Quote:
Originally Posted by kklowell View Post
Heating polycarb might get it over the barb but it will cool and be too rigid to get off the barb for cleaning, if that's the intention.
Could you use polycarb and a short piece of silicon hose over both the barb and the polycarb tube?
I think that if you tighten the silicon hose over a piece of polycarb would work with a worm drive. I say give it a try with cold water first to see if it leaks, then with warm, hot to see if expansion is a problem.
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Old 12-02-2011, 10:50 AM   #9
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Quote:
Originally Posted by kklowell
Heating polycarb might get it over the barb but it will cool and be too rigid to get off the barb for cleaning, if that's the intention.
Could you use polycarb and a short piece of silicon hose over both the barb and the polycarb tube?
That's a good idea... I guess I don't care much about cleaning super well on a bk... I'd just snap it off once every 6 months and attach a new one :-)
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Old 12-02-2011, 12:57 PM   #10
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Polycarbonate is probably going to be my fall back plan. I just don't know if the heating idea would create a watertight seal, and if it does, it still isn't quite as easy to switch out as I would ideally like. I am still holding out to find something similar to the picture above...

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