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Paint Mixing System

This paint mixing system mixes (clear) base and (colored) pigment to achieve the desired coloring, according to the ratio setpoint:

Paint Mixing System

Paint Mixing System

1. Determine what will happen to the paint’s color over time if the pigment flowmeter turbine seizes so that it does not turn even when there is adequate flow through the pipe. Also, explain why the paint’s color will be affected as you predict.

Answer:

The paint will become more and more colored over time, as the control system turns up the flow of pigment. This will happen because the ratio control system sees no pigment flow anymore, and thus turns the pigment flow on fully to try to reach setpoint.

2. Determine what will happen to the paint’s color over time if the base flowmeter turbine seizes so that it does not turn even when there is adequate flow through the pipe. Also, explain why the paint’s color will be affected as you predict.

3. For those who have studied flow measurement, explain how a turbine flowmeter functions.

4. Explain what would happen in this process if the base control valve failed fully shut.

5. Explain what would happen in this process if the base control valve failed wide-open.

6. Explain what would happen in this process if the pigment control valve failed fully shut.

7. Explain what would happen in this process if the pigment control valve failed wide-open.

8. Explain what would happen in this process if the pigment flow controller (FC) was switched from remote setpoint to local setpoint.

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