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API 653 EXAM PREP - OPEN BOOK ONLY QUESTIONS AND ANSWERS 2024
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API 653 EXAM PREP - OPEN BOOK ONLY QUESTIONS AND ANSWERS 2024
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API 653 EXAM PREP - OPEN BOOK ONLYA new tank is to be hydrostatically testes. The tank is forty feet (12m) high, two
hundred feet (61m) in diameter, and it is fabricated of A-283 Gr. C shell plates.
What is the minimum hydrostatic shell thickness of the bottom shell course?
A) 0.901"
B) 0.658"
C) 0.925"
D) 0.750" - ANSWERS-A
Flange material used for tank repair and alteration shall meet the inimum
requirments for the material specifications in which of the following?
A) The as built standard
B) ASME Section II
C) API 650 7th Ediion
D) The current applicable standard - ANSWERS-A
In regards to underside corrosion of tank bottoms, the corrosion rate of steel in a
wet environment:
A) Is independent of temperature increases above 100°F
B) Will decrease at temperature above 100°F
,C) May double with every 50°F increase above 100°F
D) May double with every 18°F increase in temperature above 77°F - ANSWERS-D
What is the definition of density of material?
A) Volume per unit mass
B) Weight per unit volume
C) Weight per square inch
D) Mass per unit volume - ANSWERS-D
Soil Corrosion appears as external thinning with :
A) Localized loss due to coating failure
B) Localized loss due to pitting
C) localized loss due to oxygen
D) Localized loss due to soil - ANSWERS-B
missing - ANSWERS-missing
When welding on a tank shell constructed of Group I steel that is greater than 1.5
inches thick below what minimum metal temperature preheat?
A) 200°F
B) 250°F
C) 350°F
,D) 300°F - ANSWERS-A
Existing welds on a tank shell are found to be closer than allowed by API 650.
Under what conditions can these welds be considered to be acceptable for
continued operation.
A) Examined by PT with no rejectable indications
B) examined by RT with no rejectable indications
C) Weld repairs to assure acceptable spacing
D) Examined by MT with no rejectable indications - ANSWERS-C
Which of the following is an advantage of thick film un-reinforced linings?
A) Easy to install on complex geometry
B) Proven to have hole-bridging capability
C) Does not require the use of plural component spray equipment
D) Fast curing and can be put back in service after 24 hours at ambient
temperature - ANSWERS-D
What is the maximum hydrostatic fill height of a tank given the following
conditions:
Year Built - 1980
Tank height - 40 feet
Tank diameter - 165 feet
Material of construction - A-285 Gr. C
, Controlling thickness - 0.538 inch
Code of construction - API 650 6th edition basic standard
Weld Joints - Butt type
A) 33.6 ft
B) 30.7 ft
C) 28.7 ft
D) 27.7 ft - ANSWERS-C
If a release prevention system utilizing a nonconductive, impervious external liner
under a new tank, which of the following shall be done?
A) Impressed current cathodic protection system must be installed
B) Anodes shall be placed between the external liner and the tank bottom is
nonconductive material
C) No action is required unless diatomaceous clay is installed as a secondary
containment
D) Anodes shall be placed between the external liner and the tank bottom in a
conductive material - ANSWERS-D
What are the two main consideration when welding austenitic stainless steels?
A) Lack of fusion and overlap
B) Solidification cracking and hot cracking
C) Under-bead cracking and HAZ cracking
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