LABORATORY PROCEDURE: Symbols and Diagrams Background InformationStudents need to know how...

LABORATORY PROCEDURE: Symbols and Diagrams Background Information

Students need to know how to read a PFD, P&ID, and a symbols legend. Students also need to understand how instrumentation fits into the diagram. Keep in mind that this is a diagram, not an actual picture of the process. The finished diagram should represent the field and panel mounted instruments properly located and connected in a control loop. Look at several P&IDs before attempting this lab procedure.

Materials Needed

• Sketching equipment (pencil, straightedge, eraser, paper, template, ruler, etc)

Safety Requirements

None required for this lab.

Procedure

a. Review the simplified process flow diagram below.

b. Study the Symbols Legend provided previously.

c. Complete the drawing by including:

• a level control loop

• a temperature control loop

• a tower feed flow control loop

d. Determine where the sensing point and the final control element for each loop will be placed on the Simplified PFD and draw them first. Complete the loop showing the controller and transmission lines. Complete one loop at a time.

e. Determine whether the loop is a simple feedback loop or a more complex control scheme such as cascade or ratio.

f. Complete the final report for this lab.

Additional Information

None

Findings

Write a short paper on each control loop included in the drawing to include how each control loop affects the process. All non-textbook drawings should be turned in with the write- up as per your specific instructor guidelines.