Use of device diagnostics.

Transcription

1 Use of device diagnostics. Hans Stevens, Shell Global Solutions PTE/EPAC Process Automation, Control, and Optimization (PACO) 2011 Copyright of Royal Dutch Shell plc

2 Agenda Agenda Topic Shell s Vision & Expectation. Diagnostic examples. Who are the users of diagnostics. When to use diagnostics. Collect of diagnostic information. Implement NAMUR107. Condition for success. Copyright of Royal Dutch Shell plc 2

3 Shell s Vision & Expectation Promises for Smart Instrument Asset Management (SIAM) Proactive maintenance using actual condition. The device build-in diagnostics (leading indicators) alerts for maintenance Predictive maintenance. The maintenance schedule is optimized on basis of failure rate and drift statistics Provide improved reliability/availability. Copyright of Royal Dutch Shell plc 3 3

4 Single Diagnostic examples Temperature Flow Level - + TC - + TC Level in blocking distance. Lead wire break Switch over to backup sensor. Empty pipe Total lost of Process value Fouling Dry probe. Copyright of Royal Dutch Shell plc 4 4

5 Compound Diagnostic examples Position deviation warning High Friction warning Blocked valve 100% Average valve position No process change. Graph information. Plug Wear Time Copyright of Royal Dutch Shell plc 5 5

6 Who are the users of diagnostics. Operation Responsible for the running Process. Maintenance Responsible for the device availability. Data acquisition Responsible for reliable data (e.g. SAP information). Copyright of Royal Dutch Shell plc 6 6

7 Operation, Responsible for the running Process Diagnostic Information about process condition. (PVstatus) Additional process information: Empty pipe. Total loss of Process value. Non-additional process information: Switch over to backup sensor. Dry probe. Level in Blocking distance. PV LL Alarm PV HH Alarm Copyright of Royal Dutch Shell plc 7 7

8 Maintenance, Responsible for the device availability Diagnostic Information about device condition. Action needed! Maintenance action needed: Total loss of Process value. Switch over to backup sensor. Fouling. No Maintenance action needed: Dry probe. Empty pipe. Level in Blocking distance. Copyright of Royal Dutch Shell plc 8 8

9 Data acquisition, Responsible for reliable data Diagnostic Information about data reliability. Data is unreliable. (not usable) Total loss of Process value Empty pipe Level in Blocking distance. Data (still) reliable. Switch over to backup sensor Dry probe Copyright of Royal Dutch Shell plc 9 9

10 When to use diagnostic Daily PV status. Avoid plant trips. Before maintenance stop To plan maintenance needs and priorities. Future Optimize maintenance stops/needs. Optimize process conditions. Copyright of Royal Dutch Shell plc 10 10

11 Collect of diagnostic information. Starting conditions: Spring pressure Cycle dead band Valve signature Operating history: Operation time. Actuator travel. Trends Predictive maintenance. Maintenance history: Make note of the needed maintenance. Make note of the device condition at stops. Copyright of Royal Dutch Shell plc 11 11

12 Implement NAMUR107 Standards Maintenance required Position deviation alarm High Friction alarm Logic Out of specification Check function Failure Blocked valve Copyright of Royal Dutch Shell plc 12 12

13 NAMUR107 Common mode faults and fault conditions Copyright of Royal Dutch Shell plc 13 13

14 Condition for success instrument Asset Management System (iams). Status overview. Status change summary. Easy to use user interface. (FDT/DTM) Additional help. Possible cause and remedy. Training of staff. Management support. Confidence between operation and maintenance staff. Experience, data history. Copyright of Royal Dutch Shell plc 14 14

15 Copyright of Royal Dutch Shell plc 15 March 2010 P06503_001 15