RISK BASED INSPECTION Exam – Day 1 (closed book) Q.1.
RBI rules give guidelines and formulas for : a] Design and construction of new equipments b] Installation procedures for new equipments c] Repairs and alteration methods for old equipments d] None of above
Q.2.
API 580 is specifically targeted at the application of RBI for : a] Hydrocarbon industries (Oil & Gas) b] Chemical process industries c] Power plants for Electric generation d] Only a and b above
Q.3.
The graphical representation of scenarios from initiation to potential outcome of an accident will be typically called as : a] Event tree b] Fault tree c] Risk tree d] Result tree
Q.4.
API 580 does not cover RBI assessment for : a] Process piping b] Storage tanks c] Structural systems d] Pressure relief devices RISK BASED INSPECTION Exam – Day 1,2,3,4. Page 1 of 16
Q.5.
The 3 approaches in RBI are typically called : a) Qualitative, Semi-Qualitative, Realistic b) Quantitative, Semi-Quantitative, Qualitative c) Realistic, Quantitative, Qualitative d) None of above
Q.6.
RBI methodology can be adopted for : a) Entire operating unit b) Section of operating unit c) Major system or major equipment d) All of above
Q.7.
Risk Management means : a) Risk mitigation b) Risk mitigation, risk acceptance c) Risk mitigation, risk acceptance and risk communication d) Risk analysis
Q.8.
The term “failure” used for Failure Analysis in RBI typically means : a) Failure due to human error b) Power failure c) Loss of containment d) All of above
RISK BASED INSPECTION Exam – Day 1,2,3,4. Page 2 of 16
Q.9.
RBI typically is focused on systematic determination of _______ for risk analysis and risk ranking a) Absolute risk b) Realistic risk c) Relative risk d) Residual risk
Q.10. “ISO risk line” typically represents: a) Constant risk level b) Risk acceptable to international organization for standards c) Incident specific occurrence of risk level d) None of above
RISK BASED INSPECTION Exam – Day 1,2,3,4. Page 3 of 16
RISK BASED INSPECTION Answer Key
Exam – Day 1 (closed book)
Q. No.
Answer
1
d
2
d
3
a
4
c
5
b
6
d
7
c
8
c
9
c
10
a
RISK BASED INSPECTION Exam – Day 1,2,3,4. Page 4 of 16
RISK BASED INSPECTION Exam – Day 2 (Open book)
Q.1.
Q.2.
Q.3
In Qualitative analysis a carbon steel vessel is known to have active SCC and is also subjected to HTHA what will be their weight age for calculating Damage Factor a)
5 and 3
b)
5 and 2
c)
2 and 3
d)
None of above
In Quantitative analysis find Inspection Factor (IF) for a process unit if vessels and piping are formally inspected for visual and UT thickness readings but there is no formal program of identification of failure mechanisms as well as evaluation of all inspection results a)
-6
b)
-10
c)
0
d)
-4
Sulfidation Rate for carbon steel at 520 o F with Sulpher content 0.5% by weight ,was 5 mpy. What will its corrosion rate be with sulpher content of 1.0% a)
3 mpy
b)
5 mpy
c)
6 mpy
d)
10 mpy
RISK BASED INSPECTION Exam – Day 1,2,3,4. Page 5 of 16
Q. 4
To avoid caustic embrittlement for the service conditions of 250 o F and 40% NAOH concentration , correct material of construction will be
(a) Use carbon steel with no PWHT (b) Use carbon steel with PWHT (c) Consider using nickel alloy (d) None of the above
Q.5
Satisfactory material for hydrogen service (800 psi partial pr. And 800o F temp) will be
Q. 6
a)
Carbon steel
b)
1 Cr- 0.5 mo steel
c)
No suitable material exists
d)
Use carbon steel with PWHT
Value assigned to “Likelihood damaged factor” in Qualitative approach to RBI is
a)
15 points
b)
25 points
c)
20 points
d)
10 points
RISK BASED INSPECTION Exam – Day 1,2,3,4. Page 6 of 16
Q.7.
Q.8.
Q.9.
API 580 classified deterioration mechanisms observed in Hydrocarbon and chemical process industries as “Thinning” which of the following are not thinning mechanisms a)
General corrosion
b)
Pitting
c)
Localised corrosion from outside
d)
All of above are thinning mechanisms
Calculate process factor (PF) for Qualitative analysis for a system experiencing about 15 interruptions per year, the process is extremely stable and even though process upsets take place. They are not harmful. The product has slight fouling and plugging potential. a)
5
b)
6
c)
8
d)
10
For Qualitative analysis, the likelihood factor works out to 36. What is likelihood category? a)
3
b)
4
c)
5
d)
2
RISK BASED INSPECTION Exam – Day 1,2,3,4. Page 7 of 16
Q.10. The NFPA flash factor and reactivity factor for a certain fluid is 4 and 3 respectively. What is its chemical factor a)
25
b)
15
c)
25
d)
20
RISK BASED INSPECTION Exam – Day 1,2,3,4. Page 8 of 16
RISK BASED INSPECTION Answer Key
Exam Day 2 (open book)
Q. No.
Answer
1
a
2
d
3
b
4
c
5
b
6
C
7
d
8
b
9
b
10
d
RISK BASED INSPECTION Exam – Day 1,2,3,4. Page 9 of 16
RISK BASED INSPECTION Exam Day 3 (closed book) Q.1.
Q.2.
Q.3.
Q.4.
Which of the following damaging mechanism is most likely to result in “thinning” a)
Failure
b)
Sulphidation
c)
Wet H2S damage
d)
Graphitization
Which of the following would most likely result in Metallurgical determination a)
HTHA
b)
Fatigue
c)
Brittle fracture
d)
Soil corrosion
Which of the following is most likely to result in stress corrosion cracking a)
Atmospheric corrosion
b)
Galvanic corrosion.
c)
Chloride attack on Austenitic S.S.
d)
None of above
Which of the following is most likely to result in Mechanical Failure a)
Fatigue
b)
Caustic attack on carbon steel pressure vessels
c)
Wet H2S attack on C. S.
d)
Both b and c
RISK BASED INSPECTION Exam – Day 1,2,3,4. Page 10 of 16
Q.5.
Q.6.
Logic models Event Tree and Fault tree are extensively used in: a)
Qualitative Analysis
b)
Quantitative Analysis
c)
Used in both a and b
d)
Used in neither a or b
“Fault Tree” represents a logical model showing a) Initiation of an event and its consequences b) Various ways which lead to the occurrence of event c) Faults in Design and Construction of equipment d) Faulty in operation and maintenance of the equipment
Q.7.
Q.8.
Typical parameters used for assessing environmental damage are : a)
Acres of land affected per year
b)
Miles of shoreline affected per year
c)
Number of human-use resources affected
d)
All of above
Determining representative fluid and selecting a set of hole rises is essential step in : a)
Qualitative approach only
b)
Quantitative approach only
c)
Essential for both
d)
Essential for none
RISK BASED INSPECTION Exam – Day 1,2,3,4. Page 11 of 16
Q.9.
In RBI consequence analysis all releases are modeled in two types, namely : a)
Instantaneous release and continuous release
b)
Continuous release and intermittent release
c)
Intermittent release and Instantaneous release
d)
“Puff” release and Instantaneous release
Q.10. In RBI consequence analysis, if fluid inside the vessel is liquid but its boiling point is less than 800F, the phase considered for consequence analysis will be taken as : a)
Solid
b)
Liquid
c)
Gas
d)
Liquid – Gas mixture
RISK BASED INSPECTION Exam – Day 1,2,3,4. Page 12 of 16
RISK BASED INSPECTION Answer Key
Exam Day 3 (closed book)
Q. No.
Answer
1
b
2
a
3
c
4
a
5
b
6
b
7
d
8
b
9
a
10
c
RISK BASED INSPECTION Exam – Day 1,2,3,4. Page 13 of 16
RISK BASED INSPECTION Exam Day 4 (open book) Q.1.
Determine basic TMSF for chloride stress cracking. Chloride concentration is 150 ppm temperature = 1800F. M.O.C. = Austenitic S.S. PH of process water = 9. Inspection “usually effective”. No of inspection so far = 2 a] 1670
Q.2.
Q.3.
b] 500
c] 250
d] 1000
Determine universal sub-factor for Quantitative analysis for a plant with following description •
Plant maintenance, layout, housekeeping etc – Equal to industry standard
•
Winter temperature at plant site = 300F
•
Plant located in seismic zone = 3 a)
Zero
b)
1
c)
2
d)
3.5
For Quantitative analysis, “Continuity element” which depends on planned and unplanned shutdowns will have what number value for a plant having average of one shut down (planned) per year and unplanned shutdowns are also about one per year a)
-1.5
b)
0
c)
-2.5
d)
4.5
RISK BASED INSPECTION Exam – Day 1,2,3,4. Page 14 of 16
Q.4.
Q.5.
An inspection method is described as the one which will correctly identify actual damage at about 70% occasions. This will be categorized as : a)
Highly effective inspection
b)
Fairly effective inspection
c)
Usually effective inspection
d)
None of above
It was estimated that for a certain facility handling flammable fluid, the probability of failure = 0.001 per year and probability of ignition was 1 in 100. If consequence loss due to this fire is 5 million US dollars, what is the risk of fire in US dollars per year a)
50
b)
500
c)
5
d)
None of these
RISK BASED INSPECTION Exam – Day 1,2,3,4. Page 15 of 16
RISK BASED INSPECTION Answer Key
Exam Day 4 (open book)
Q. No.
Answer
1
c
2
c
3
c
4
c
5
a
6
b
7
c
8
b
9
c
10
d
RISK BASED INSPECTION Exam – Day 1,2,3,4. Page 16 of 16
