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Instrumentation Questions For You

Solenoid Valves Questions & Answers – 7

S Bharadwaj Reddy
Suppose this valve control system has a problem. The control valve (LV-104) does not move to the full-open position as it should when the solenoid is de-energized, although it will

Solenoid Valves Questions & Answers – 6

S Bharadwaj Reddy
This fluid diagram shows the components and connections of a Bettis self-contained hydraulic module used to automatically shut off a “line valve” on a natural gas pipeline in the event

Solenoid Valves Questions & Answers – 5

S Bharadwaj Reddy
Sketch arrows next to each of the two solenoid valves showing the directions of air flow in the energized (E) and de-energized (D) states, assuming the process control valve is

Solenoid Valves Questions & Answers – 4

S Bharadwaj Reddy
Sketch arrows next to each of the two solenoid valves showing the directions of air flow in the energized (E) and de-energized (D) states, assuming both of the solenoid valves

Solenoid Valves Questions & Answers – 3

S Bharadwaj Reddy
Determine the “normal energization” states (e.g. NE or NDE) of each solenoid valve in this diagram, assuming the process valve needs to be closed when the process is running as

Solenoid Valves Questions & Answers – 2

S Bharadwaj Reddy
Solenoid valve SV-92 plays an important role in this compressor inlet separator control system. Level control valve LV-92 opens up when needed to drain liquid out of the “boot” of

Solenoid Valves Questions & Answers – 1

S Bharadwaj Reddy
A burner management system (BMS) monitors the status of the flame at the base of this incinerator, to ensure fuel gas does not keep entering the combustion chamber unless there

Practical Process Control System Questions & Answers – 20

S Bharadwaj Reddy
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,

Practical Process Control System Questions & Answers – 19

S Bharadwaj Reddy
An operator reports a high level alarm (LAH-12) displayed at the control room for the last 13 hours of operation, in this sour water stripping tower unit (where sulfide-laden water

Practical Process Control System Questions & Answers – 18

S Bharadwaj Reddy
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

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