ANSWERS | COMPREHENSIVE STUDY GUIDE|A+ STUDY RESOURCE |
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" -
ANSWER
5.00"
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 -
ANSWER
Probabilistic and Deterministic
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" -
1
,ANSWER
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 -
ANSWER
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 ma-
chine.
a. Design head
b. Operating head
c. Working head
d. Hydrostatic head -
ANSWER
Hydrostatic head
Cone roof storage tanks may be as large as ______ feet in diameter.
a. 100'
b. 50'
c. 300'
d. 80' -
ANSWER
2
,300'
The simplest type of floating roof is the:
a. Pan
b. Pontoon
c. Double deck
d. Cone -
ANSWER
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%
d. 19.5% -
ANSWER
19.5%
Lead-in-Air analyzers must be designed to measure _______ Lead-in-Air concentrations.
a. Organic
b. Inorganic
c. Radioactive
d. Liquid -
ANSWER
Organic
Entry into a confined space is considered to have occurred as soon as:
3
, 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. -
ANSWER
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 flamma-
ble liquids beneath the tank by:
a. Purging with CO2
b. Purging with N2
c. Water flooding
d. Using an odorized gas -
ANSWER
Water 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 oper-
ations, an area of at least ______ should be scraped down to bare metal.
a. 6"
b. 24"
c. 10"
d. 12" -
ANSWER
12"
What is the axis of a weld?
a. A line drawn parallel with the base of the material.
4
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" -
ANSWER
5.00"
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 -
ANSWER
Probabilistic and Deterministic
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" -
1
,ANSWER
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 -
ANSWER
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 ma-
chine.
a. Design head
b. Operating head
c. Working head
d. Hydrostatic head -
ANSWER
Hydrostatic head
Cone roof storage tanks may be as large as ______ feet in diameter.
a. 100'
b. 50'
c. 300'
d. 80' -
ANSWER
2
,300'
The simplest type of floating roof is the:
a. Pan
b. Pontoon
c. Double deck
d. Cone -
ANSWER
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%
d. 19.5% -
ANSWER
19.5%
Lead-in-Air analyzers must be designed to measure _______ Lead-in-Air concentrations.
a. Organic
b. Inorganic
c. Radioactive
d. Liquid -
ANSWER
Organic
Entry into a confined space is considered to have occurred as soon as:
3
, 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. -
ANSWER
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 flamma-
ble liquids beneath the tank by:
a. Purging with CO2
b. Purging with N2
c. Water flooding
d. Using an odorized gas -
ANSWER
Water 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 oper-
ations, an area of at least ______ should be scraped down to bare metal.
a. 6"
b. 24"
c. 10"
d. 12" -
ANSWER
12"
What is the axis of a weld?
a. A line drawn parallel with the base of the material.
4
