MEASURING - 7 - NMC TESTING_Air Used by System Components

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* 1. Enter your first and last name

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* 2. To measure the air used by pulsators, the pulsators should be disconnected or switched off, the AFM should be readjusted so that the receiver returns to the operating vacuum level, and the new airflow reading should be recorded.

True

False

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* 3. Typical values of the amount of air used by pulsators:

range from 20 to 40 LPM per pulsator

are less than 20 LPM per pulsator

range from 20 to 40 CFM per pulsator

are more than 1.5 CFM per pulsator

range from 75 to 150 LPM per pulsator

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* 4. To measure the amount of air used by milking clusters, the clusters should be disconnected or isolated from the milkline or weigh jars, the AFM should be readjusted so that the receiver returns to the operating vacuum level, and the new airflow reading should be recorded.

True

False

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* 5. Typical values of the amount of air used by clusters:

range from 30 to 50 LPM per cluster

are less than 10 LPM per cluster

are more than 0.5 CFM per pulsator

range from 10 to 15 LPM per cluster

range from 10 to 15 CFM per cluster

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* 6. To measure the amount of air admitted by the vacuum regulator, the regulator should be removed, the connection should be plugged, the AFM should be readjusted so that the receiver returns to the operating vacuum level, and the new airflow reading should be recorded.

True

False

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* 7. Select all that apply. Air leaks in the system:

should be less than 1% of the pump capacity under operating conditions

can be estimated by calculating the difference between the total operating vacuum pump capacity measured at the pump inlet with the gate valve closed and the AFM reading taken at the same location and operating vacuum level, with all of the components deactivated and the piping system connected with the gate valve open

should be less than 10% of the pump capacity under operating conditions

can be estimated by calculating the difference between the AFM readings recorded with all components disconnected and the AFM reading at the pump inlet measured at the pump inlet vacuum

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* 8. Order the steps (from 1 to 4) in the best sequence to measure air admitted/used by system components.

1. Record the airflow admitted to the receiver (or the vacuum supply line, for weigh jars) under these conditions.

2. Adjust the AFM to admit air to the receiver to bring the receiver to its operating vacuum.

3. Disable conventional vacuum regulators; in systems with VFD controllers, set it to a constant speed (60 Hz).

4. Ensure the teatcups are plugged, the pulsators are operating, and the vacuum is applied to the clusters.

4,1,2,3

2,3,4,1

4,3,1,2

3,2,1,4

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* 9. Order the steps (from 1 to 4) in the best sequence to measure the air admission of a milking unit.

1. Calculate the difference between AFM readings.

2. Readjust the AFM so that the receiver vacuum is returned to its operating vacuum level.

3. Consider the difference between AFM readings the maximum air admitted by one milking unit during attachment, detachment, falloff, and liner slips.

4. Unplug the teatcups of one milking unit and open the unit so that it admits its maximum airflow.

3,2,4,1

1,3,4,2

3,4,1,2

2,1,4,3

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* 10. Number the steps in the best sequence (from 1 to 6) to measure the vacuum pump capacity.

1. Compare the airflow measured to the manufacturer's rating chart to assess pump wear.

2. Before starting the pump, open the AFM fully.

3. Disconnect the vacuum pump from the rest of the milking system.

4. Place an open AFM meter as close to the pump inlet as possible.

5. Measure the airflow at the manufacturer's recommended level, usually 50 kPa or 15 inches of mercury.

6. Adjust the airflow meter to measure airflow through the pump at the operating pump inlet vacuum to assess the reserve capacity of the system.

5,1,3,4,6,2

5,2,1,3,4,6

1,2,4,5,3,6

4,5,1,2,6,3

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* 11. Number the steps in the best sequence (from 1 to 6) to measure the air admission of one teatcup.

1.Open the unplugged teatcup so that it admits its maximum airflow.

2. Calculate the difference between the AFM readings.

3. Consider the difference between the AFM readings the maximum air admitted by one teatcup during attachment, detachment, and liner slip.

4. Readjust the AFM so that the receiver vacuum is returned to its operating vacuum level.

5. Unplug one teatcup of the milking unit, leaving the other three teatcups plugged.

6. Close the unit.

2,4,5,3,1,6

2,5,3,4,6,1

3,2,1,4,5,6

1,4,2,3,5,6