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Old 01-31-2010, 01:06 PM   #1
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Default Sight Glass ?s

Hey Guys,

I'm starting to think about my sight glasses for HLT and BK.

I've got 1/2" couplers in my kettles, and was thinking about simply using a 1/2" MPT x 1/2" tube swagelok elbow fitting. My question is will the swagelok get a good and watertight grip on the polycarbonate or Pyrex tube, or would a standard compression fitting with o-rings be best?

What is the general consensus on tube, polycarbonate, Pyrex, other? I plan to fashion a protective sleeve out of SS tube to cover the clear tube so I am not totally worried about fragility.

Thoughts?

Thanks,

Bryan

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Old 01-31-2010, 01:16 PM   #2
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I used swagelock on mine but because the glasses were borsilite(sp) I swapped the crush ferrel with silicone orings. Works great.

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Old 01-31-2010, 03:37 PM   #3
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Very nice, as I have the Swageloks on hand...

Where have you guys found to be the best source for the "Pyrex" glass, which I believe is the same as the boroscillate?

Thanks!

BK

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Old 01-31-2010, 04:25 PM   #4
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You can get it from any place that sells art glass. You're looking for 12.7mm heavy wall SIMAX tubing. The wall thickness should be 2.7mm. Make sure you have them cut to length and flame polish the ends to keep them from chipping. Buy a couple extras.The orings you need are silicone #111.

Get the real glass tubing out of your mind if you don't have a plan for protecting it.

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Old 02-01-2010, 10:54 PM   #5
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Bobby M,

If you don't mind me asking, what type of stores sell art glass? Online retailer? Was hoping to find something local to get the cuts and polish...

Thanks,

Bryan

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Old 02-02-2010, 02:31 AM   #6
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Not every town has places that do this kind of thing. Phillyglassworks is one place I know of. Also, scientific/labwares type places may also stock SIMAX. This is probably one of those things you need to buy and have shipped.

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Old 02-02-2010, 03:15 AM   #7
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If you use polycarbonate with a compression fitting then learn from my mistakes. Do not tighten too much or I guarantee the tube will shear at the fitting. Just tighten enough to make it snug and water tight!

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Old 02-02-2010, 03:51 AM   #8
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I got a polycarb. sightglass from BobbyM. It has the swaglok fittings and silicone orings. It works great and doesn't take that much force to get it water tight.

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Old 02-02-2010, 05:39 AM   #9
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I just ordered some of these polypropylene o-ring compression elbows from US Plastics and some polycarbonate tube from mcmaster.

We'll see how they work. Way better price than swagelocks.


http://www.usplastic.com/catalog/item.aspx?itemid=23261

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Old 02-02-2010, 01:17 PM   #10
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Yeah, I guess it's important to mention it again. Whether you're using borosilicate or polycarbonate, it's not worth it to try using the metal ferrules in the compression fittings. A stack of 2-3 silicone orings are the ticket.

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