Dear Coriolis Expert,
What parameter on coriolis (to be precise on 5700 transmitter) which indicate that there is deposit or plugging on tube?, are SMV and Zero Verification enough?,
need help with detail technical explanation on this.
Thank you in advance,
Hi again Faiz - you are definitely on the right track. The detection of coating or scale buildup inside a Coriolis sensor can be a challenge depending on how much buildup is actually present, how it's distributed, and how closely its density matches the surrounding fluid. Detecting it under flowing conditions is the most challenging scenario.
Micro Motion's Smart Meter Verification (SMV) Basic, which is now included with most sensors at no charge, is designed to look for changes in the stiffness of the tubes caused by mechanical transformation (such as erosion or corrosion). Unfortunately, many coating deposits, like paraffin wax, do not affect the overall tube stiffness and may go unnoticed by our basic SMV tests.
On the other hand, the optional SMV Professional package includes a "non-uniform" coating diagnostic. It works by looking for a trending separation between the two pickoff signals due to repeatable tube imbalances – a plugged tube would be easy to detect this way. The hard part is guessing whether your coating will be uniform. Some coatings will build from one-side-in and be detectable almost immediately, whereas others will build slowly and steadily until the process is impacted before an alarm is raised. Other variables to look at:
I hope this helps. Feel free to reach out to Flow.Support@Emerson.com to receive a more specific diagnosis if you have process data you’d like to share.
In reply to Jared Drennen:
Hi Jared, Thank you for the great explanation. So during flow condition, options that we have for deposit checking on tubes are: (cmiiw) 1. SMV basic + monitor drive gain reading. Next step (during no flow) : zero verification and perform checking for air and water tube freq Or 2. SMV Professional Another questions are: 1. Can we look at also at left and right pickoff voltage value to indicate for any tube unbalance? 2. We did the installation with vertical orientation, would it be reduced the possibility for any deposits on tube 3. SMV Pro means the licensed on 5700, it's not the Prolink version . Is it right? 4. If we have just SMV Basic. In order to be the professional version, would it be done by purchasing the license and upgrade 5700 firmware? Thank you in advance, Faiz
In reply to Faiz Faiz:
Hi Faiz - one minor correction - SMV Basic does not detect coating. To identify coating during flow, you can try to use density, drive gain, pickoff voltages, and possibly flow rate (if the tubes are actually being restricted). During non-flow, check zero, density, and tube frequency under known fluid conditions. As to your other questions:
One thing I forgot to mention that is specific to paraffin detection is Temperature monitoring. You can set an alarm to alert you if the temperature drops below a certain setpoint. This is highly useful for detecting failed heaters or jacketing systems.
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