Heat Exchanger Temperature Control
Since the outlet temperature of a heat exchanger can only change if there is an imbalance of inlet and outlet heat rates (assuming constant liquid inlet temperature and constant liquid…
Liquid Level Control using Flow Loop
Since liquid level can only change in a vessel if there is an imbalance of inlet and outlet flow rates, would this system be practical to achieve steady liquid level…
Paint Mixing System
This paint mixing system mixes (clear) base and (colored) pigment to achieve the desired coloring, according to the ratio setpoint: Paint Mixing System 1. Determine what will happen to the…
Wiring Diagrams of PLC and DCS Systems – DI, DO, AI, AO
PLC and DCS control systems Wiring Diagrams for Digital Input (DI), Digital Output (DO), Analog Input (AI), and Analog Output (AO) signals.
Question on Analytical Controller
The ratio between base flow and pigment flow in this paint-mixing control system is not fixed. Rather, it comes from the output of an “analytical” controller: Analytical Controller 1. Explain…
Auto Sugar Bag Filling Station
The implementation of total automation of packing and filling station in sugar factories is not followed in some industries to reduce the investment costs and uses the manpower to do…
Problem on Solar Hot Air Collector and Variable Speed Fan
This solar hot-air collector bank uses a variable-speed fan as the final control element, the temperature controller commanding the fan to blow air at different rates in order to maintain…
Identify the Purpose of Flow Ratio Controller
Identify the purpose of the flow ratio controller FFC-41 in this distillation process piping and instrumentation diagram (P&ID). Flow Ratio Controller Click on the Image to Zoom Answer: The purpose…
Problem on Weigh feeder
Weigh feeders are conveyor belts equipped with load cells to measure the weight of material on a section of the belt, and variable-speed motor drives to adjust the rate at…
Stripper Overhead Temperature Control System
The stripper overhead temperature control system (loop #21) works adequately, but not as good as it could. In its present form, the temperature tends to be affected by variations in…
