Flanged Rotameter Caused Pipe Weld Cracks and Gives Wrong Readings
Heavy 4” 300# flanged rotameter not only gives wrong readings but also caused pipe weld cracks in the process plant.
Erratic H2 Flow Rotameter
Erratic H2 flow rotameter readings prevented newly charged catalyst reduction and delayed Reformed Gas Production.
Unreliable Ammonia Flow Transmitter Reading and Problems
Instrumentation engineering root cause analysis of unreliable ammonia flow transmitter reading and problems.
Serious Constraints Prevent using an Available Turbine Flow Meter
Serious constraints which prevent using an available 3” 150# flanged turbine flow meter made flangeless for Bolting between 300 # RF Flanges.
#20 PLC Best Practices – Identify Critical Alerts
Identify PLC critical alerts and program a trap to monitor the trigger conditions and the alert state for any deviation.
#19 PLC Best Practices – Monitor PLC Memory Usage
Measure and provide a baseline for memory usage for every PLC controller deployed in the production environment and trend it on the HMI.
#18 PLC Best Practices – Store PLC Hard Stop Events from Faults
Store PLC hard stop events from faults or shutdowns for retrieval by HMI alarm systems to consult before PLC restarts.
#17 PLC Best Practices – Log PLC Uptime and Trend it on HMI
Log PLC uptime to know when it’s been restarted. Trend and log uptime on the HMI for diagnostics.
#16 PLC Best Practices – Create Trend for Cycle Time on HMI
Summarize PLC cycle time every 2 to 3 seconds and report to HMI for visualization on a graph using trend.
#15 PLC Best Practices – Safe State when PLC Restarts
Define safe states for the process in case of PLC restarts (e.g., energize contacts, de-energize, keep the previous state).
