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  1. #1
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    Poor Temperature



    Can anyone assist with the following

    We have a Mycom Compressor that runs to freeze down a spiral tunnel and at the side of the Mycom we have a Grasso SP2 compressor runs to freeze down a Polobed for ice lollies. Both compressors use the same liquid pumps, Surge Drum and receiver etc

    The problem I have is both compressors are controlling at the SP Value but at the tunnel and polobed it is -22.0 when it should be -44.0. The only thing i can see different is the liquid pump pressure is at 0.8bar when we are used to seeing it at 1.75bar

    If you require more info i will try but i dont have a refrigeration back ground



  2. #2
    Join Date
    Feb 2007
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    Re: Poor Temperature

    Quote Originally Posted by Mark Ridgway View Post
    If you require more info i will try but i dont have a refrigeration back ground
    We have a Mycom Compressor that runs to freeze down a spiral tunnel and at the side of the Mycom we have a Grasso SP2 compressor runs to freeze down a Polobed for ice lollies.
    So I take it this process is quite important for your business and it's profit then?

    Time to call a professional refrigeration engineer to help you.

    Sorry but there is only so much that can be done over the internet.


  3. #3
    Join Date
    Dec 2007
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    Re: Poor Temperature

    Quote Originally Posted by Mark Ridgway View Post
    Can anyone assist with the following

    We have a Mycom Compressor that runs to freeze down a spiral tunnel and at the side of the Mycom we have a Grasso SP2 compressor runs to freeze down a Polobed for ice lollies. Both compressors use the same liquid pumps, Surge Drum and receiver etc

    The problem I have is both compressors are controlling at the SP Value but at the tunnel and polobed it is -22.0 when it should be -44.0. The only thing i can see different is the liquid pump pressure is at 0.8bar when we are used to seeing it at 1.75bar

    If you require more info i will try but i dont have a refrigeration back ground
    Mark see below otherwise get Grizzly on the case, he will fix it.

    Are refrigerant levels "normal" in surge drum?
    Are you draining oil from low points of surge drum at regular intervals (usually when plant is shutdown & pressures up so not to suck in air).
    Liquid pumps may have low point to drain oil as well (any oil is to much).
    Do liquid pumps have differential protection to protect them.
    Can you swap over to spare liquid pump if you have one & see if any difference, after checking levels & oil logging?

    Would assume compressors are controlling at correct set point but unloaded more than normal (%load indication)
    Last edited by RANGER1; 21-06-2014 at 11:26 PM.

  4. #4
    Join Date
    May 2007
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    Auckland
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    Re: Poor Temperature

    Low pump pressure would indicate low flow rate and performance at process end, caused by low liquid level in surge vessel, short of refrigerant, pump cavitation from rapid loading of compressors, minimum flow bypass open wide , or a flow bypass relief jammed open, liquid stacked up in condenser receiver, level regulation in surge vessel faulty.
    Good idea is get a professional to sort which one is the problem.

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