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  1. #1
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    service manifolds



    has anyone had there gauges calibrated was asked by insurance man if i had calibration certificate for my gauges



  2. #2
    Brian_UK's Avatar
    Brian_UK is offline Moderator I am starting to push the Mods: of RE Site Moderator : and general nice guy
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    Re: service manifolds

    I was led to believe that manifold gauges are self calibrating as you can adjust the zero before taking readings.

    They are not test gauges merely indicators.
    Brian - Newton Abbot, Devon, UK
    Retired March 2015

  3. #3
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    Re: service manifolds

    .

    I think they can be classed as two types Brian.

    Normal service gauges that we calibrate before use and even maintain / repair
    ourselves and then the gauges that are used for pressure testing.

    Our own gauges do not really need to be calibrated above being zeroed but
    Pressure testing gauges if used for official commissioning and documenting do
    need to be calibrated to prove they are within tolerance.
    The same with our weighing scales as well.

    Rob

    .
    .. ... -. .----. - / -- --- .-. ... . / -.-. --- -.. . / --. --- --- -..

  4. #4
    Brian_UK's Avatar
    Brian_UK is offline Moderator I am starting to push the Mods: of RE Site Moderator : and general nice guy
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    Re: service manifolds

    I certainly agree with you there Rob as pressure tests are a certifiable event.
    Brian - Newton Abbot, Devon, UK
    Retired March 2015

  5. #5
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    Re: service manifolds

    Probably depends on what you work on to a certain degree, but if not accurate what's the point!
    We would calibrate our gauges & thermometers as a minimum annually against a calibrated, certified test gauge, log results, replace/repair as necessary.
    Things get damaged, or out of calibration through general use.
    If something goes wrong, or accident, you have some kind of traceability.

    Pressure testing/vacuum.
    Setting high pressure cut out switches, or verify transducer reading.
    Back pressure regulators so don't freeze product, or set up as design.
    Checking against gauges on site on compressor packages.
    Verify performance of equipment.
    Pressure drop in pipework
    Superheat accuracy

    Nothing worse than setting a heap of pressure switches when your pressure or temperature gauge is not reading correctly.
    Digital can be wrong as well

    Same with your vacuum pump, check vacuum etc
    Last edited by RANGER1; 06-08-2021 at 09:39 PM. Reason: Superheat

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