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  1. #1
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    Pressure Testing



    Hi Friends ,

    To ensure that there is no further leakage in the chiller , we do pressure testing with Nitrogen.

    Firstly, for how much time we should stand this pressure to ensure that there is no further leakage ?

    Secondly , how much pressure should be given to the chiller working on R134a and R22 (High limits of pressure are mentioned on the chiller by the manufacturer)



  2. #2
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    Re: Pressure Testing

    without trying to sound crass i really thimk you should get a professional in to do this for you there is so much that can go wrong.

  3. #3
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    Re: Pressure Testing

    Hi, Sumit

    Quote Originally Posted by Sumit View Post
    Hi Friends ,

    To ensure that there is no further leakage in the chiller , we do pressure testing with Nitrogen.

    Firstly, for how much time we should stand this pressure to ensure that there is no further leakage ?

    Secondly , how much pressure should be given to the chiller working on R134a and R22 (High limits of pressure are mentioned on the chiller by the manufacturer)


    Just for leak test it is enough to pressurize complete system with nitrogen up to 10-12 bar.

    Leave it for 24 hours or 48 hours i.e. from noon time today to noon time tomorrow/day after tomorrow. Write down air temperature and check it again tomorrow.

    You need temperature readings in case of different pressure readings .... maybe is not leak in the system just different temperature.

    Be careful with safety devices and gauges connected to your unit ... maybe devices or gauges cannot resist that pressure ... it is better to disconnect or isolate them with valves, if ...

    You must be very careful and use pressure reducing valve on nitrogen bottle, otherwise you can injure yourself or some other person or ruin chiller.

    Please, read carefully my signature ... especially, the last row ....

    Best regards, Josip
    Last edited by Josip; 22-07-2011 at 09:04 PM. Reason: add some text

    It's impossible to make anything foolproof because fools are so ingenious...

    Don't ever underestimate the power of stupid people when they are in large groups.

    Please, don't teach me how to be stupid....
    No job is as important as to jeopardize the safety of you or those that you work with.

  4. #4
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    Re: Pressure Testing

    Hi Josip,

    Thanks for your reply.

    I do pressure testing of chiller at least once in a week.But I am unaware about the significance of writing down the " Air Temperature " . As you said, sometimes there is no leak , its just a pressure difference. I will be thankful to you , if you will explain it in.

  5. #5
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    Re: Pressure Testing

    Hi, Sumit

    Quote Originally Posted by Sumit View Post
    Hi Josip,

    Thanks for your reply.

    I do pressure testing of chiller at least once in a week.But I am unaware about the significance of writing down the " Air Temperature " . As you said, sometimes there is no leak , its just a pressure difference. I will be thankful to you , if you will explain it in.
    Sorry, this I do not understood ...... why and how you make a pressure testing of chiller at least once in a week .... can you explain that, please ...


    Please, carefully read again my answer
    You need temperature readings ...just different ..... .
    if we have a pressure difference -/+ (you can have even higher pressure next day, or the same but still with the leak/s) we have to know why .... due to leak or due to temperature change ....
    It is not a good way to tell you all ... I had to learn and you must too nowadays is easy .... very easy .... in my time there were not internet and not enough books end even not so much knowledge as todays ... so what you learn is yours forever and then you can transfer your knowledge to new generation/s ... agree

    ... there are some formulas to calculate P, V or T for ideal gas ... in your case the V volume is the same .... P pressure must be the same in case of no leak .... but can be different due to environment temperature T ... i.e. air temperature in your room ... that is the reason why we need temperature readings to calculate state of our gas ... nitrogen ....

    Be careful .... P and T in formula for calculation are in absolute units ....

    Here you can read more about ...
    http://en.wikipedia.org/wiki/Ideal_gas_law

    hope this will be of some help to you .... if not, come back again, please.

    Best regards, Josip

    It's impossible to make anything foolproof because fools are so ingenious...

    Don't ever underestimate the power of stupid people when they are in large groups.

    Please, don't teach me how to be stupid....
    No job is as important as to jeopardize the safety of you or those that you work with.

  6. #6
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    Re: Pressure Testing

    Hi Josip ,

    I got it now, the significance of considering room temperature in pressure testing.

    Actually , i work for a maintenance company ; we have contracts of operation, maintenance and commissioning of chiller plants.I usually work on YORK chillers and I found that they are more prone to " GAS LEAK " as compared to other chillers like Trane,Carrier etc.

    Thanks for your help and have a great weekend.

    Sumit

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