10 Questions on Reforming Furnace Control System
Reforming furnaces are special process furnaces used to generate pure hydrogen gas from a hydrocarbon feed gas, such as methane. The balanced chemical reaction for this process is as follows:...
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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...
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...
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...
Problem on Tachogenerator
A tachogenerator is a small DC generator designed to output a voltage directly proportional to the speed of a rotating shaft. These instruments are used to generate an analog electrical...
Pneumatic Level Transmitter Calibration Table
A pneumatic level transmitter has a calibrated range of 0 to 5 feet, and its output signal range is 3 to 15 PSI. Complete the following table of values for...
Determine Resistance value of Resistors
Determine the nominal resistance values of these resistors, given their band colors, and also express the allowable tolerance in ohms (i.e. what the minimum and maximum acceptable resistance values are...