Tag : process control instrumentation interview questions

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,

A level control system 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

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

Pictured here is a P&ID (Process and Instrument Diagram) of a liquid flow control “loop,” consisting of a flow transmitter (FT) to sense liquid flow rate through the pipe and

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

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

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

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