Temperature compensation in Plant Incoming Feed and on product out lin
Temperature compensation in Plant Incoming Feed and on product out lin
(OP)
Hi alls,
I have one question about temperature compensation in plant incoming feed flow lines and product out going lines theses include, Liquid hydrocarbons and gas lines.
My question is why temperature compensation were not used for inside plant flow transmeters for material balance arround the distillation columns and reactors (separators)?
What the reason and why no temperature compensation used in, inside flow transmeters.
Thanks
108/15L
I have one question about temperature compensation in plant incoming feed flow lines and product out going lines theses include, Liquid hydrocarbons and gas lines.
My question is why temperature compensation were not used for inside plant flow transmeters for material balance arround the distillation columns and reactors (separators)?
What the reason and why no temperature compensation used in, inside flow transmeters.
Thanks
108/15L





RE: Temperature compensation in Plant Incoming Feed and on product out lin
rmw
RE: Temperature compensation in Plant Incoming Feed and on product out lin
One thermocouple how much can cost infront of easy material balance calcullations arround the columns, separators.
Could you elaborate this philospy please!!!
Thanks
10815L
RE: Temperature compensation in Plant Incoming Feed and on product out lin
The more complicated you make the controls, the greater the chance of failure- i.e. consider the impact of failure of the temperature measurement resulting in wacky readings. It is usually just more trouble than it is worth. Your meters will already consider the flowing density at an assumed process temperature which is usually good enough.
If you have engineering units of mass being displayed already, consider yourself lucky. The greater problem usually is finding the flowing density (and standard density if using standard volumetric flow) already being used so as to convert volumetric units to mass.
In many cases for plant data reconcilliation purposes, just free the large stream to make a square case. For example: sum your distillate and product flow (and compositions) to calculate the feed flow to a tower- it will be off a bit from the plant measure but your job will be considerably easier. If off alot there is a bad meter anyway. By making this simplifying assumption, the overall and component balances will match exactly for column simulation etc.
best wishes,
sshep
RE: Temperature compensation in Plant Incoming Feed and on product out lin
sshep-thanks a lot for detailed answer, now I understand the philospy of temperature compensation.
Thanks
10815L
RE: Temperature compensation in Plant Incoming Feed and on product out lin
What were the calibration conditions?
Is the temperature relatively stable?
If temperature doesn't vary significantly, you may not need to have continuous monitoring.
If the process temperatures are relatively stable and known, then it may be that the meters were calibrated for that condition.
Maybe they are calibrated to give the volume at the process temperature or maybe they are calibrated to give the volume at the reference temperature.
So the first thing to check would be the meter specifications to see what the reality is and then to see if the current conditions match the original calibration conditions.
JMW
www.ViscoAnalyser.com
RE: Temperature compensation in Plant Incoming Feed and on product out lin
I will check all conditions and will back soon here.
Thanks
10815L
RE: Temperature compensation in Plant Incoming Feed and on product out lin
Flow transmeter is DP type, and no reference temperature was used.
Damping factor is used 0.48 and TF is used 0.07 line temperature is used that is the real time time temperature.
Hope you will explain further based on this input.
Thanks
10815L