Armfield Instruction Manual
100
Change the PSV valve setting to 0% (fully closed). Again note whether the fluid level
can be maintained using only pump A at this minimum inlet flow rate.
Select the
icon to finish data logging.
Create a new results sheet by selecting the
icon.
Return the PSV valve setting to the value it was set to before commencing the next
section of the exercise.
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 completely closing the drain valve in the base of the
vessel. This will decrease the outflow rate compared to the inflow rate.
Note the change required in control of pump A to maintain fluid height in the process
vessel.
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.
Return the drain valve to a partially closed position.
Effect of Vessel Volume
In the software, set the PSV to 0%. This will stop flow into the large process vessel.
Fully open the drain valve in the base of the large process vessel and allow the water
to drain from the vessel.
Carefully remove the lid on top of the large process vessel and remove inner
cylinder. This increases the effective volume of the process vessel.
Replace the lid and partially close the drain valve.
Select the
icon to begin data logging.
Maintain the fluid level in the tank at the Set Point level by controlling pump A.
Select the
icon to finish data logging.
Create a new results sheet by selecting the
icon.
If there is sufficient laboratory time then the investigations of disturbances, feed rate
and inlet/outlet flow rates may be repeated at this reduced volume.
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