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Thread: leak testing
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13-02-2009, 07:24 PM #51
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13-02-2009, 07:41 PM #52
Re: leak testing
Also what sealant do you use ?
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14-02-2009, 06:13 AM #53
Re: leak testing
Read, some engeneers couldn't solder well enough to hold a pressure test for 2 -3 hours.
If only hold 4 to 6 Torr for 2 to 3 hours, pressurize the system with nitro and find then fix the leaks.
If the system is dry and sealed it should hold 0.5 Torr (500 micron) for 24 hours.
Distalated water? Sealant? Hu?
Solder your pipes in properly.
inspect the welds with a mirror and torch, then pressure test with nitro. If the system holds the pressure test, vac it to 500 micron and if you have to do a vacuum test. If you've been putting "distalated water" in the system, don't expect it to pass a vacuum test.
How is any gas loss in a newly installed and commissioned system acceptable?
If your people are competent and the system has been pressure tested and vacced properly there should be no leaks in the first 12 months of operation.
I can only assume that something has been lost in the translation.
or have I missed something here?
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14-02-2009, 06:38 AM #54
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Re: leak testing
I think both methods are good methods (vacuum test and pressure testing).
With pressure test you have high pressure difference at sides of leak (leak rate is high) and low accuracy (resolution) manometers to test leak and also influence of temperature change on test gas pressure.
On the other end, you have small pressure difference (1 bar) between sides of leak (leak rate is small but still present), but very precise and sensitive instrument to detect that small leak rate, and very, very, very small influence at reading of temperature change of gas remained in vacuumed pipes.
To me it looks like both methods are equally good with one key difference. If some welds are mechanically weak, pressure test will make them to open and leak but vacuum test will never disclose them.
That is why I will always make first pressure test and then vacuum test on systems where welds are involved.
On split systems with pipes in one piece, only vacuum test is sufficient.
That is my 2 cents.
Also, keep in mind this:
http://www.refrig.com/bigblumanual3....RTHING%20LEAKSLast edited by nike123; 14-02-2009 at 06:41 AM.
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14-02-2009, 08:32 AM #55
Re: leak testing
It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
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14-02-2009, 08:46 AM #56
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Re: leak testing
Peter, my country is not in EU (and probably will not be) and we are not obliged here to follow that norms. Our norms are still harmonizing with EU regulation.
I wrote that from perspective of common sense and not from perspective of norms and regulations.
That is my 2 cents.Last edited by nike123; 14-02-2009 at 08:55 AM.
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14-02-2009, 09:05 AM #57
Re: leak testing
It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
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14-02-2009, 09:07 AM #58
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14-02-2009, 09:13 AM #59
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Re: leak testing
Last edited by nike123; 14-02-2009 at 09:17 AM.
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14-02-2009, 12:55 PM #60
Re: leak testing
it actually worries me about some of the work that is being carried out in different countries, i can see why a lot of countries have not changed to 410A either as i don't think the techs would be able to carry out the work.
If you are a fully qualified refrigeration engineer and have not been bred into it, the work to be carried out on installations should be of some similar quality, sealants and Co2 being used, hmm, if a strength test and leak test is not being carried out properly, i would hate to see what is going to happen when a VRV Co2 system is installed....hmmmm... i am scared and can see why there are so many leaks and problems out there and need for regulations!!!
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14-02-2009, 04:35 PM #61
Re: leak testing
A CO2 VRV, what's that?
It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
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14-02-2009, 04:54 PM #62
Re: leak testing
it is a Variable Refrigerant Volume, multi system running on CO2 gas.
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14-02-2009, 05:02 PM #63
Re: leak testing
What brands are already selling a CO2 VRV in the EU?
None I suppose.It's better to keep your mouth shut and give the impression that you're stupid than to open it and remove all doubt.
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14-02-2009, 05:18 PM #64
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Re: leak testing
I dont know is any in Europe.
Daikin: The global supplier is presenting a world premiere, as its latest VRV (Variable Refrigerant Volume) model is now using the natural refrigerant CO2. It is optimised for heating function. The outside unit features a heating capacity of 31.5 kW for heating, and 28 kW for cooling. Daikin has applied a new refrigeration cycle technology with a swing compressor and a newly developed heat exchanger. The CO2 model is compatible with all VRV control and management systems.
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24-02-2009, 01:47 PM #65
Re: leak testing
you should only use OFN for this pressure testing
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25-02-2009, 08:33 AM #66
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25-02-2009, 08:48 AM #67
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25-02-2009, 08:58 AM #68
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