Questions on Ratio Control System
A byproduct of the kraft process used in the paper industry for turning wood chips into pulp is a liquid called black liquor. This liquid contains many volatile sulfur compounds…
Fault in the Temperature Loop
An operator tells you the stack temperature of this incinerator is running high as indicated by TIC-37. The setpoint is set at 1400 degrees F, but the PV display shows…
Temperature Controller Problem
Suppose a chemical reactor is heated by steam. A temperature controller varies the amount of steam admitted to a “jacket” surrounding the reactor: Temperature Controller Problem Ever since this process…
How Valve Positioners act as Cascade Control Systems in a Loop?
Explain how all valve positioners essentially act as cascade control systems in a loop, and why valve positioners generally improve control quality as a result. Valve Positioners Furthermore, examine this…
Problem on Water Filter Discharge Pressure Transmitter and Gauge
In this article, we are discussing an example problem on water filter discharge pressure transmitter and gauge, and these two readings are not matching. Water Filter Discharge Pressure This water…
Control Valves Pre-Commissioning Checklist
In this guide, we have the control valves pre-commissioning checklist which includes installation, inspection, testing, and taking valve online.
What LIC and FIC Controllers will do?
In this example problem, we discuss about both LIC and FIC controllers and what will they do over time if the flow or level transmitter fails or if control valve…
Problem in Water Level Control System
This water level control system (for a municipal water supply operation) is supposed to maintain constant water level in the filter and in the clearwell. Unfortunately, it has a problem.…
Burner Safety Logic for Initial Lighting
In this article we will go throw some Standard burner safety logic for initial lighting of the burner and also we are going to implement these logics in ladder format…
Problem on Pressure and Level Control Loops
Examine these pressure and level control loops (transmitter-controller-valve systems) for an industrial boiler, controlling both water level and steam pressure: Pressure and Level Control Loops If the PIC setpoint is…
