Large Air Receiver

1. Level Station Pressure Station Foxboro 743cb Digital Controller Pump 80 PSI Supply Air Level Column 4-20 ma 4-20 ma I2P 100% I2P Converter S Transmitter Exhaust Valve (demand) A/M Station Medium Air Receiver Muffler 2AP+A5 2AI-I2V 2AO-V2I Large Air Receiver 1+ 3+ 1+ 2+ 3+ 1+ 1- 3- 1- 2- 3- 1- 0% Manifold Drain NIA02 Loop Calibration, Control & Troubleshooting2009

2. Course Terminal Objective: Given the necessary tools, equipment and references the I&C technician will calibrate and troubleshoot instrumentation loops. Mastery will be demonstrated by successful completion of all in class exercises,Laboratory Practical Evaluations and scoring 80% or better on an end of course exam.

3. Topics: • Isolating & Restoring Instruments • Foxboro coding refresher • Loop Calibration (calibration principles) • Loop Control (loop tuning) • Loop Troubleshooting • Industry Events • 40 hour class • 7 labs • - CBT exam

7. 3 valve manifold section • How many ways are there to valve out a transmitter? • How many ways to put one back into service? • How many are acceptable? • What are we trying to prevent? • What if the transmitter in question has a dry reference leg? How does this change valving it in or out? Six ways. Six ways.

8. What do we NOT want to happen when isolating & restoring an instrument • Full system pressure on one side of a transmitter and atmospheric on the other side • System flow through the 3-valve manifold • Loss of wet reference legs • Water in dry reference legs • Leaving instruments out of configuration • Disturbing other instruments on shared sensing lines

9. Possible ways to valve out a transmitter

10. High Pressure test tap Low Pressure test tap Equalizing Valve Instrument Low Pressure tap Instrument High Pressure tap High Side Isolation Low Side Isolation Process High Pressure tap Process Low Pressure tap Typical Dragon Three-Valve Manifold

11. Process Flow Instrument Root Valves Equalizer Low Side Isolation High Side Isolation Flow through 3-valve manifold LP HP

12. Possible Sequences for returning a transmitter to service

13. Process Flow Instrument Root Valves Equalizer Low Side Isolation High Side Isolation LP HP Out of service, root valves shut

14. Process Flow Instrument Root Valves Equalizer Low Side Isolation High Side Isolation LP HP Open Root valves

15. Process Flow Instrument Root Valves Equalizer Low Side Isolation High Side Isolation LP HP Check equalizer open, then open low side isolation

16. Process Flow Instrument Root Valves Equalizer Low Side Isolation High Side Isolation LP HP Shut equalizer

17. Process Flow Instrument Root Valves Equalizer Low Side Isolation High Side Isolation LP HP Shut equalizer valve

18. Process Flow Instrument Root Valves Equalizer Low Side Isolation High Side Isolation LP HP Open High Side Isolation

19. Process Flow Instrument Root Valves Equalizer Low Side Isolation High Side Isolation LP HP Transmitter in service

20. On to SPEC 200 Coding