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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1 thought on “Paint Mixing System”

  1. Answer 2
    The paint will become no colored over time, as the control system fully turn off the flow of pigment. This will happen because the ratio control system sees no base flow anymore, and thus turn off the pigment flow fully to try to reach zero setpoint.

    Answers 3
    Turbine flow meters use the rotation of a rotor within a flow tube to translate the flow of liquid into a readable rate.
    The rotation of a pinwheel sensed magnetically. With magnetic sensors, the rotation of the turbine generates a “pulse” which is picked up by a sensor.

    Answer 4
    will become no colored paint over time, as base control Valve fail close and fully shut the control system sense no base flow and  turns off flow of pigment. This will happen because the ratio control system sees no base flow anymore, and thus turns the pigment flow off fully to try to reach zero setpoint.

    Answer 5
    will become maximum production and maximum colored paint over time, as base control Valve fail wide open and fully open the control system sense max base flow and  turns  flow of pigment on . This will happen because the ratio control system sees maximum base flow , and thus turns the pigment flow on  to try to reach to setpoint.

    Answer 6
    The paint will become no color over time, as the pigment control valve fully shut and turn the flow of pigment off . This will happen because the ratio control in good healthy but no responding from pigment control Valve and always fully shut

    Answer 7
    paint will become more and more colored over time, as pigment  control valve fully open make  the flow of pigment to maximum. This will happen because the ratio control system in good health but can’t control the pigment control valve, and thus the pigment flow will fully all time.

    Answer 8
    paint will become sometimes more and sometimes less colored over time,when switch from remote to local, the pigment  control valve will have always constant flow rate enev if base flowrate increased or decreased, due to local setpoint .

    Reply

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Paint Mixing System

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