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API 653 CLOSED BOOK EXAM QUESTIONS AND ANSWERS 100% PASS

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API 653 CLOSED BOOK EXAM QUESTIONS AND ANSWERS 100% PASS Two methods of quantifying the remaining thickness of tank bottoms are mentioned in API 653. One method uses the formula involving "MRT". What is the name of the other method? a. Deterministic and Analytic b. Methodological and Non-des...

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  • January 10, 2025
  • 37
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • Api 653
  • Api 653
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EmilyCharlene
API 653 CLOSED BOOK EXAM
QUESTIONS AND ANSWERS
100% PASS

Two methods of quantifying the remaining thickness of tank bottoms are mentioned in

API 653. One method uses the formula involving "MRT". What is the name of the other

method?


a. Deterministic and Analytic


b. Methodological and Non-destructive


c. Quantitative and Destructive


d. Probabilistic and Deterministic - ✔✔Probabilistic and Deterministic


What is the maximum out-of-plumbness allowed from the top of the shell to the bottom

of the shell on a 48' high tank?


a. 5.76"


b. 5.00"


c. 5.48"




EMILY CHARLENE © 2025, ALL RIGHTS RESERVED 1

,d. 4.80" - ✔✔5.00"


Due to strength requirements, the minimum thickness of an annular plate ring is

usually greater than:


a. 0.187"


b. 0.125"


c. 0.100"


d. 0.250" - ✔✔0.100"


The joint between the new material of an insert plate and the old material of the existing

tank shell plate shall be:


a. Lap welded


b. Plug welded


c. Butt welded


d. Fillet welded - ✔✔Butt welded


A pressure test at least 1.5 times the __________ shall be performed on a nozzle installed

by hot tapping after the valve has been installed on it and prior to mounting the hot tap

machine.


a. Design head


b. Operating head




EMILY CHARLENE © 2025, ALL RIGHTS RESERVED 2

,c. Working head


d. Hydrostatic head - ✔✔Hydrostatic head


Cone roof storage tanks may be as large as ______ feet in diameter.


a. 100'


b. 50'


c. 300'


d. 80' - ✔✔300'


The simplest type of floating roof is the:


a. Pan


b. Pontoon


c. Double deck


d. Cone - ✔✔Pan


An oxygen deficient atmosphere exists when a tank atmosphere has less than what

percent oxygen by volume?


a. 18.5%


c. 15.0%


b. 19.0%




EMILY CHARLENE © 2025, ALL RIGHTS RESERVED 3

, d. 19.5% - ✔✔19.5%


Lead-in-Air analyzers must be designed to measure _______ Lead-in-Air

concentrations.


a. Organic


b. Inorganic


c. Radioactive


d. Liquid - ✔✔Organic


Entry into a confined space is considered to have occurred as soon as:


a. Half the entrant's body is inside the confined space.


b. The entrants head enters the confined space.


c. A part of the entrant's body breaks the plane of an opening into the space.


d. The entrant's head and shoulders enters the confined space. - ✔✔A part of the

entrant's body breaks the plane of an opening into the space.


When repairs involve most of the tank bottom, it may be desirable to displace the

flammable liquids beneath the tank by:


a. Purging with CO2


b. Purging with N2


c. Water flooding



EMILY CHARLENE © 2025, ALL RIGHTS RESERVED 4

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