(a)
Explain the sequence of operations required to pump sumps.
(a)
Explanation of Solution
Discussion:
Float switches are used to start or stop a pump motor according to the changes in the liquid (water) level in a sump or tank. These are connected to a pump motor for sump pumping or tank operations.
If the sump is in full condition, it is required to start the pumping operation in order to empty the sump. To start the pumping operation, the float rises first and then the float switch contacts are closed. When the float switch contacts are closed, the pumping operation starts quickly in the system.
If the sump is in empty condition, it is required to stop the pumping operation in order to fill the sump. To stop the pumping operation, the float lowers first and then the float switch contacts are opened. The float lowers either directly or through a motor starter. When the float switch contacts are opened, the pumping operation stops quickly in the system.
Conclusion:
Thus, the operations required to pump sumps are explained.
(b)
Describe the sequence of operations required to fill tanks.
(b)
Explanation of Solution
Discussion:
If a tank is in full condition, it is required to stop the motor operation in order to empty the tank. To stop the motor operation, the float rises first and then the float switch contacts are closed. When the float switch contacts are closed, the motor driven pump is stopped immediately in the system.
If the tank is in empty condition, it is required to start the motor operation in order to fill the tank. To start the motor operation, the float lowers first and then the float switch contacts are opened. When the float switch contacts are opened, the motor operation starts immediately in the system.
Conclusion:
Thus, the operations required to fill tanks are described.
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