Section 3 SAFETY AND SECURITY SYSTEMS AND DEVICES

Question 1

43. What is the procedure to install a hydrogen sulfide (H₂S) gas detector?

Answer 1

A. Mount the detector on the ceiling, then verify the operation and the alarm with sample gas.
B. Mount the detector above a doorway, then inject a 4-20 mA signal to verify the operation and the alarm.
C. Mount the detector 0.5 m (1.5 ft.) above the floor, then verify the operation and the alarm with sample gas.
D. Mount the detector 2 m (6 ft.) above the floor, then inject a 4-20 mA signal to verify the operation and the alarm.

Question 2

44. An instrument used in a safety interlock on a process control loop must be calibrated. What is done to prevent the process from shutting down after notifying operations personnel?

Answer 2

A. Put the process in AUTO and enable the safety interlock.
B. Put the process in AUTO and bypass the safety interlock.
C. Put the process in MANUAL and enable the safety interlock.
D. Put the process in MANUAL and bypass the safety interlock.

Question 3

45. A flame detector in a vapor combustion unit is not detecting the pilot flame. What is the cause?

Answer 3

A. Incomplete combustion.
B. Misalignment.
C. Excess temperature.
D. Insufficient temperature.

Question 4

46. What is the procedure to replace a heater control unit in a zirconium oxide O₂ analyzer?

Answer 4

A. Bypass shutdown logic, obtain permit, remove analyzer from service, remove and replace heater control unit, recalibrate, then return to service.
B. Obtain permit, remove analyzer from service, remove and replace heater control unit, bypass shutdown logic, recalibrate, then return to service.
C. Obtain permit, bypass shutdown logic, remove analyzer from service, remove and replace heater control unit, recalibrate, then return to service.
D. Remove analyzer from service, obtain permit, bypass shutdown logic, remove and replace heater control unit, return to service, then recalibrate.

Question 5

47. Which safety integrity level (SIL) is required when installing an SIS into a process requiring an equivalent risk reduction factor of 1,000 to 10,000 years?

Answer 5

A. 1
B. 2
C. 3
D. 4

Question 6

48. Refer to Figure 73. In an SIS, which diagram indicates a 2 out of 2 (2oo2) polling architecture?

Answer 6

A. A
B. B
C. C
D. D

Question 7

49. Which regular maintenance procedure is preformed to stroke test an ESD valve when used as part of an SIS?

Answer 7

A. Notify operations, bypass shutdowns, manually stroke the valve, visually confirm valve stroke, return to service, then document results.
B. Notify supervisor, bypass shutdowns, manually stroke the valve, visually confirm valve stroke, return to service, then document results.
C. Notify operations, bypass shutdowns, manually stroke the valve, visually confirm valve stroke, then return to service.
D. Notify operations, bypass shutdowns, manually stroke the valve, return to service, then document results.

Question 8

50. Test gas is applied to an H₂S sensor. The value on the display is reading above the alarm set point but the alarms are not being triggered. What is the cause?

Answer 8

A. The wrong test gas is applied.
B. The sensor has a blown fuse.
C. The wrong sensor is installed.
D. The output relay is faulty.

Question 9

51. Upon completion of a repair, what is required to configure a smart transmitter?

Answer 9

A. A digital gauge.
B. An oscilloscope.
C. A communicator.
D. A multimeter.