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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Thu Aug 07, 2008 10:25 am Post subject: Strechy Tube Stuff |
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I am looking to replace the hose on the back of my Barco LC housings with something that has a little more flexibilty. I want to replace it because I have some tubes that have cracked under pressure indicating that there is not enough flexibility in the hose that Barco used. Also I have a relatively new Green tube that has a short length of very flexible hose attached indicating that Barco realised the problem. I can not seem to find this flexible hose locally. Does anyone have any idea what it might be and of course a supplier.
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Thu Aug 07, 2008 12:23 pm Post subject: |
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Air works wonders! Vent a few ml of the glycol and make an air bubble.
Look up the 'NEC tube breakage' threads for the full explanation: Short version is glycol is terribly hygroscopic and increases in volume as it absorbs water. Vent the tubes and be good for a few years, even in a terribly humid environment.
_________________
"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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Ile
Joined: 09 Mar 2006
Posts: 1491
Location: Jyväskylä, Finland
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| Posted: Thu Aug 07, 2008 12:31 pm Post subject: |
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Try to search silicon hose, that would be more flexible than plastic.
I chanced that hose system to bit different, using original hose. I cutted that hose to three part and now there is only short hose from bottom to top connector for convection. That hose have branch-T in near top connector, it's connected to about 1 m long hose that have about half air space for expansion. That way I managed to get very big air bubble that wont block convection and don't make reflections to picture, what would happen with bubble in original system.
I sealed that air hose after projector was running few hours, so there is now small underpressure when projector is cold, that should prevent leaks...
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Curt Palme
CRT Tech
Joined: 08 Mar 2006
Posts: 24396
Location: Langley, BC
TV/Projector: All of them!
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| Posted: Thu Aug 07, 2008 12:42 pm Post subject: |
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I've never had a problem with the hoses, even on really old tubes. As Heywood says, the issue is glycol pressure. Put some air bubbles into that hose, and you're good in that manner for another few years.
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km987654
Joined: 25 Jul 2007
Posts: 2874
Location: Australia
TV/Projector: Barco BG809s
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| Posted: Thu Aug 07, 2008 10:20 pm Post subject: |
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Apart from the hopeless clams that leak the hoses are OK except I was looking for something that would expand if pressure were to build up. The air gap is something I am testing now but it Might create some reflection off the undersurface of the glycol. I will stay with the air gap for the moment though.
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