Exercise F
79
Alter the feed rate again by repeating the adjustment to the pressure regulator. Note
the action required to maintain fluid level.
Continue to reduce the feed rate until the fluid level in the vessel no longer returns to
the set point level (the drain rate exceeds the inlet flow rate).
Select the
icon to finish data logging.
Create a new results sheet by selecting the
icon in the tool bar of the software.
Effect of Inlet and Outlet Flow Rates
Investigate the effect of an inflow rate greater than the outflow rate, and of an outflow
rate greater than the inflow rate:
Select the
icon to begin data logging.
Decrease the outflow rate by closing the drain valve in the base of the vessel, but do
not completely close the valve. This will decrease the outflow rate compared to the
inflow rate. Note the control actions required in the operation of the PSV valve in
order to maintain fluid level.
Increase the outflow rate compared to the inflow rate by fully opening the drain valve.
Select the
icon to finish data logging.
Create a new results sheet by selecting the
icon in the tool bar of the software.
Effect of Vessel Volume
Carefully remove the lid on top of the large process vessel and remove the inner
cylinder. This increases the effective volume of the process vessel.
Select the
icon to begin data logging.
Control the fluid level in the vessel for five minutes.
Select the
icon to finish data logging.
Create a new results sheet by selecting the
icon in the tool bar of the software.
If there is sufficient laboratory time then the investigations of feed rate and inlet/outlet
flow rates may be repeated at this increased volume.
Results
For easy identification or results, it is suggested that each results sheet is renamed
with a descriptive title (e.g. ‘Flowrate’, ‘Volume’, etc.). The entire workbook should be
saved with a suitable filename for future reference (e.g. PCT40 Exercise F).
Each set of data should be plotted on a graph of fluid level against time.
Make a comparison of each variation in the experimental conditions against the
results for basic manual control during the first part of the exercise. Retain the results
for comparison with automated control as in the following exercise.
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