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15-05-2009, 05:48 PM #1
1/4" sight glass on 1 1/8" L Line
hi guys, we are currently installing some systems on a site where we had no input into the kit/components selection.
basically this company has sent us 1/4" soldered type moisture indicator/sight glass. being installed are 1 1/8" Liquid lines, now they say use reducing "T" pieces (1 1/8" x 1 1/8" x 1/2" with 1/2" to 1/4" reducer) to install the sight glass "parallel" to the liquid line. they say ensure the sight glass is installed at "highest" gravitational point to ensure anye bubbles in LL will flow into the sight glass and wont bypass it to give false indication,
i can understand the theory behind it because if you had say 2 1/8" liquid line or 3 1/8" i don't even think a sight glass that big exists, at least the biggest danfoss do is 1 1/8" from what i can see.
is this common practice?
i know the easiest thing to do is just buy 1 1/8" sight glass but they refuse! lol, i also know i should just get on with it because thats how they want it but i cant help but get some other opinions.
--0-- Sight Glass 1/4"
| ... |
--------------- Liquid Line 1 1/8"
( sorry, ignore the ... i had to put them in to make it line up correctly,hope you all understand :-/ )
thanks for any input, btw its a bit late to change anything as this starts monday!Last edited by SkyWalker; 15-05-2009 at 05:58 PM.
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15-05-2009, 06:38 PM #2
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Re: 1/4" sight glass on 1 1/8" L Line
Check last page at bottom here! Model 3780.
Last edited by nike123; 15-05-2009 at 06:43 PM.
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15-05-2009, 06:49 PM #3
Re: 1/4" sight glass on 1 1/8" L Line
o.k lol, so they do exist bigger than 1 1/8" (28mm). what about the install i have been asked to do, any opinions?, essentially the sight glass will be installed horizontally above the horizontal liquid line.
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15-05-2009, 06:57 PM #4
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15-05-2009, 07:30 PM #5
Re: 1/4" sight glass on 1 1/8" L Line
skywalker
i've seen this and done it myself plenty of times, usually the 1/4 lines are drilled and brazed directly to the pipe so the way they suggest is better!
it's also cheaper to buy a 1/4 sightglass and there in lies your price; to install
al
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15-05-2009, 10:34 PM #6
Re: 1/4" sight glass on 1 1/8" L Line
thanks for the reply al, im pleased this is done by other people. will install in confidence now, cheers mate
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15-05-2009, 11:04 PM #7
Re: 1/4" sight glass on 1 1/8" L Line
no bother mate.
al
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16-05-2009, 09:48 AM #8
Re: 1/4" sight glass on 1 1/8" L Line
Perhaps a silly question.
With the sight-glasses being installed at the highest point, after teeing off the large line before & after - would these not perhaps develop a gas pocket eventually? In other words - a gas lock.
The sight-glass socket sets which sit directly on the main line, would be a better idea, in my view.Last edited by desA; 16-05-2009 at 09:51 AM.
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16-05-2009, 10:40 AM #9
Re: 1/4" sight glass on 1 1/8" L Line
and myn but the company we working for wont budge, they say this is common practice and it saves £
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16-05-2009, 12:44 PM #10
Re: 1/4" sight glass on 1 1/8" L Line
Using 1\4 sight glasses brazed on top of any size liquid line is the quickest and cheapest way.
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18-05-2009, 01:04 AM #11
Re: 1/4" sight glass on 1 1/8" L Line
Have seen these in chillers but they are not at the highest gravitational point. In fact they are probably at the lowest point.
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