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Process Control Loop Testing

S Bharadwaj Reddy
A very useful technique for testing process control loop response is to subject it to a “step-change” in controller output. In other words, the process is perturbed (the highly technical...

Identify Level Control Loop Tuning Problems

S Bharadwaj Reddy
A level control loop is supposed to maintain a constant level of liquid at the bottom of the stripping tower where considerable amount of vibration exists, but it seems to have...

Process Control High Level Alarm Fault Analysis

S Bharadwaj Reddy
An operator reports a high level alarm (LAH-12) displayed at the control room for the last 13 hours of operation, in this sour water stripping tower unit (where sulfide-laden water...

Compressor Emergency Shutdown Root Cause Analysis

S Bharadwaj Reddy
The compressor emergency shutdown system (ESD) has tripped the natural gas compressor off-line three times in the past 24 hours. Each time the operator goes to reset the compressor interlock,...

Liquid Flow Control Loop Controller Action

S Bharadwaj Reddy
A liquid flow control loop consisting of a flow transmitter (FT) to sense liquid flow rate through the pipe and output an electronic signal corresponding to the flow. A flow...

Practical Process Control System Questions & Answers – 16

S Bharadwaj Reddy
Inspecting the trends of PV and SP on a process chart recorder, you notice the poor quality of control: The “wandering” of the process variable (PV) around setpoint may be...

Practical Process Control System Questions & Answers – 14

S Bharadwaj Reddy
In this process, maple syrup is heated as it passes through a steam heat exchanger, then enters an evaporator where the water boils off. The purpose of this is to...

Practical Process Control System Questions & Answers – 13

S Bharadwaj Reddy
In this process, maple syrup is heated as it passes through a steam heat exchanger, then enters an evaporator where the water boils off. The purpose of this is to...

Practical Process Control System Questions & Answers – 12

S Bharadwaj Reddy
In this process, two chemical streams are mixed together in a reactor vessel. The ensuing chemical reaction is exothermic (heat-producing) and must be cooled by a water cooling system to...

Practical Process Control System Questions & Answers – 11

S Bharadwaj Reddy
Examine this P&ID for a level control system in a vessel where two different fluids (Feed A and Feed B) are mixed together: Determine the effect on the control system’s...

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