API 653 CLOSED BOOK
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 - answerProbabilistic 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"
d. 4.80" - answer5.00"
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" - answer0.100"
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 - answerButt 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
c. Working head
d. Hydrostatic head - answerHydrostatic head
Cone roof storage tanks may be as large as ______ feet in diameter.
a. 100'
b. 50'
c. 300'
,d. 80' - answer300'
The simplest type of floating roof is the:
a. Pan
b. Pontoon
c. Double deck
d. Cone - answerPan
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%
d. 19.5% - answer19.5%
Lead-in-Air analyzers must be designed to measure _______ Lead-in-Air
concentrations.
a. Organic
b. Inorganic
c. Radioactive
d. Liquid - answerOrganic
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. - answerA 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
d. Using an odorized gas - answerWater flooding
Tank surfaces that have been in contact with leaded gasoline should be scraped down
to bare metal. On each side of a line that might be heated excessively by welding or
other operations, an area of at least ______ should be scraped down to bare metal.
a. 6"
b. 24"
c. 10"
d. 12" - answer12"
What is the axis of a weld?
a. A line drawn parallel with the base of the material.
, b. A line through the center of the weld, parallel with the sides of the weld.
c. A line through the center of the weld, perpendicular with the weld.
d. A line drawn from the base to the throat of a weld - answerA line through the center
of the weld, parallel with the sides of the weld
In monitoring the density limitations of radiographs, either a ________ or step wedge
comparison film shall be used for judging film density.
a. Proportionometer
b. Galvanometer
c. Densitometer
d. Penetrameter - answerDensitometer
During tank roof evaluations, roof plates corroded to an average thickness of less than
______ in any 100 square inch area shall be repaired or replaced.
a. 0.06"
b. 0.12"
c. 0.10"
d. 0.09" - answer0.09"
API 653 covers minimum requirements for maintaining the integrity of above ground
storage tanks.
a. After placed in service.
b. Before
c. During construction.
d. During testing. - answerAfter placed in service
In the evaluation of fixed roofs for continued service, particular attention must be given
to:
a. The number of columns used for a roof.
b. The size of columns vs. the roof load.
c. The possibility of internal corrosion of pipe columns.
d. The configuration of the columns and attachments. - answerThe possibility of internal
corrosion of pipe columns
In determining the lowest average thickness t avg (or t1) over a length of "L" of a tank
shell plate, the inspector shall use at least _______ equally spaced measurements over
the length of "L".
a. Three
b. Six
c. Ten
d. Five - answerFive
To determine if a tank is suitable for continued operation, t1 shall be greater than or
equal to t min subject to verification of all intended loadings and the value of t2 shall be
greater than or equal to what percent of t min?
a. 30%
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 - answerProbabilistic 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"
d. 4.80" - answer5.00"
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" - answer0.100"
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 - answerButt 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
c. Working head
d. Hydrostatic head - answerHydrostatic head
Cone roof storage tanks may be as large as ______ feet in diameter.
a. 100'
b. 50'
c. 300'
,d. 80' - answer300'
The simplest type of floating roof is the:
a. Pan
b. Pontoon
c. Double deck
d. Cone - answerPan
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%
d. 19.5% - answer19.5%
Lead-in-Air analyzers must be designed to measure _______ Lead-in-Air
concentrations.
a. Organic
b. Inorganic
c. Radioactive
d. Liquid - answerOrganic
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. - answerA 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
d. Using an odorized gas - answerWater flooding
Tank surfaces that have been in contact with leaded gasoline should be scraped down
to bare metal. On each side of a line that might be heated excessively by welding or
other operations, an area of at least ______ should be scraped down to bare metal.
a. 6"
b. 24"
c. 10"
d. 12" - answer12"
What is the axis of a weld?
a. A line drawn parallel with the base of the material.
, b. A line through the center of the weld, parallel with the sides of the weld.
c. A line through the center of the weld, perpendicular with the weld.
d. A line drawn from the base to the throat of a weld - answerA line through the center
of the weld, parallel with the sides of the weld
In monitoring the density limitations of radiographs, either a ________ or step wedge
comparison film shall be used for judging film density.
a. Proportionometer
b. Galvanometer
c. Densitometer
d. Penetrameter - answerDensitometer
During tank roof evaluations, roof plates corroded to an average thickness of less than
______ in any 100 square inch area shall be repaired or replaced.
a. 0.06"
b. 0.12"
c. 0.10"
d. 0.09" - answer0.09"
API 653 covers minimum requirements for maintaining the integrity of above ground
storage tanks.
a. After placed in service.
b. Before
c. During construction.
d. During testing. - answerAfter placed in service
In the evaluation of fixed roofs for continued service, particular attention must be given
to:
a. The number of columns used for a roof.
b. The size of columns vs. the roof load.
c. The possibility of internal corrosion of pipe columns.
d. The configuration of the columns and attachments. - answerThe possibility of internal
corrosion of pipe columns
In determining the lowest average thickness t avg (or t1) over a length of "L" of a tank
shell plate, the inspector shall use at least _______ equally spaced measurements over
the length of "L".
a. Three
b. Six
c. Ten
d. Five - answerFive
To determine if a tank is suitable for continued operation, t1 shall be greater than or
equal to t min subject to verification of all intended loadings and the value of t2 shall be
greater than or equal to what percent of t min?
a. 30%
