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Thread: Helium leak testing
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14-01-2015, 08:40 PM #1
Helium leak testing
Guys
Anyone offer some advice regarding the best leak detector when using helium as a trace element during leak testing?
We have a large VRV install with a small leak and the original installer has used Armaflex tape on all the refnets and flares, so uncovering them is going to be a nightmare
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14-01-2015, 08:50 PM #2
Re: Helium leak testing
unwrap the tape off the flares- indoors come with sleeves - had a mitsi unit to pressure test in nottingham- used 3 bottles of nitro- wouldnt hold 5 bar- had to crank the bottle upto 40 bar to hear the 2 open ends in the ceiling space
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14-01-2015, 08:53 PM #3
Re: Helium leak testing
Hi Frank, I use JAVAC http://www.javac.co.uk/gas-mate-hydr...292.html,along with climate centres trace gas, and have never failed to find a leak with it so far. Pressure test system to around 6 bar use as a normal electronic detector. Can be an issue pinpointing large leak as the detector is so sensitive, you can ad just the sensitivity though.
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15-01-2015, 09:02 AM #4
Re: Helium leak testing
They haven't fitted the flare covers - taped everything up, including the refnets
We've started stripping and testing the flares but it's taking too long
- had a mitsi unit to pressure test in nottingham- used 3 bottles of nitro- wouldnt hold 5 bar- had to crank the bottle upto 40 bar to hear the 2 open ends in the ceiling space
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18-01-2015, 11:44 AM #5
Re: Helium leak testing
Update
splashed out some cash and bought the Javac 718-202-G1sniffer.
Found the leak inside one of the cassettes. ... using the tracer gas
Thanks for the heads up
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18-01-2015, 03:42 PM #6
Re: Helium leak testing
Frank,
use this stuff on all your flares and you never have a leak there any more.
http://www.refrigtech.com/Product/Se...ylog_blue.html
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19-01-2015, 09:22 AM #7
Re: Helium leak testing
Hey Frank did the nitro with the helium make it easier to find the Leak? I was told that the helium has smaller molecules so you use less to find the leaks. Any feed back would be good.
Thanks
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19-01-2015, 01:51 PM #8
Re: Helium leak testing
Helium is (very) expensive depend of production in USA scaled down long time and helium in air can make interference in your search ie. ~ 5 ppm Helium in air.
New solution is using nitrogen with 1% hydrogen and sensors can detect to air level of hydrogen as 0.5 ppm
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19-01-2015, 05:20 PM #9
Re: Helium leak testing
Climate centre sell trace gas which is 95% nitrogen and 5% hydrogen.
The difference between genius and stupidity is that genius has its limits.
Marc
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19-01-2015, 08:13 PM #10
Re: Helium leak testing
Thanks Guys
It was the Tracer gas from FSW together with the Javac sniffer http://www.javac.co.uk/gas-mate-hydr...-pr-16292.html
Well done CONRAD...good call.
I thought that it was Helium but it turns out it is Hydrogen/OFN mix.
Another tool to add to my ever expanding tool chest.
Chemi
It wasn't one of my installs...they usually leak like a sieve and the leaks are easy to find
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19-01-2015, 09:43 PM #11
Re: Helium leak testing
Glad it worked for you too Frank!!. The comparative high cost of the Tracer gas compared to OFN has to be worth it if it saves labour time.
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20-01-2015, 05:34 AM #12
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20-01-2015, 06:19 AM #13
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10-02-2015, 09:44 AM #14
Re: Helium leak testing
Hi..I am using multiRae pro,a multiple gas detector.It is a portable,hand held detector having PID.I am using it and is working fine for me....
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10-02-2015, 07:47 PM #15
Re: Helium leak testing
Any link to the manufacturers Web site?