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…
How to Implement Ratio Control in this System?
A variety of chemicals are added to raw water when treating it for human consumption, and also when treating water for many industrial processes. In the coagulation stage, chemicals are…
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…
