Pressure-Compensating Flow Indicators

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: As always, anyone else's experience is appreciated.

: Over the years, I've found that one must be careful in randomly compensating flow meters (steam or process flow indicators).  The real crux of the problem is that the flow and pressure must be independent of each other.  For example, when the flow is moved it is important that the pressure does NOT move.  If this is the case, then pressure-compensation will work very well.  Otherwise, you will stand a chance of the flow controller interacting with the pressure.  Thus the compensating term will potentially exasperate the problem.

: The lower the pressure (e.g. low pressure steam) the more value you will receive from the compensating.  For example, around the Gulf coast hot afternoon showers will really cause havoc on low pressure steam headers.  Additionally, if you have "opened-up" a regulatory TIC and having your multivariable controller going directly to the steam FIC, your going to be in for a substantial swing!  

: "Opening up TICs verses going directly to flows or Valves", that is another area that is worth further discussion!!!  Additional memo/memos will follow!!


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