U3 ICC TANK TIGHTNESS LATEST 2026 QUESTIONS AND
ANSWERS GRADED A+
✔✔30. When using water for vapor freeing what is one reason that this method may
become prohibited. - ✔✔A. The high cost of water
B. Treatment/disposal
C. Transportation of the water
D. All of the above
Answer B
✔✔31. During the prossess of water filling a tank exessive amounts of flammable
vapors will be expleed throught the fill opping. What is one way to temporarily minimize
the escape. - ✔✔A. Temporarily cap the oppening
B. Using an educator type air mover
C. Fill the tank slowly
D. A and C
Answer A
✔✔32. Steam can be used to clean and vapor-free a tank. However, a large
___________ _______________ can build up on the nozzle of the steam jet. This can
make steam cleaning dangerouse and if other meathoses are avalable steam purging
should be avoided. - ✔✔A. Explosive detonation
B.
✔✔33. The tank atmosphere and the excavation area should be regularly tested why.
for flammable or combustible vapor - ✔✔Answer
For flammable or combustible vapor
✔✔34. What device should be used to test the tank - ✔✔Combustible gas indicator
probe into the fill opening at the bottom
✔✔35. Readings ______% or less of the lower flammable limit must be obtained before
the tank is considered safe for removal from the ground. - ✔✔20%
Answer
✔✔36. Thanks should be labeled after removal from the ground but prior to removal
from the ______________ - ✔✔A. Site
B. Abnegation
C. Cleve
D. None of the above
Answer A
, ✔✔37. Warning of certain types of reuse. The former content and present vapor state of
each tank including vapor-freezing treatment and date should be written on the tank in
_____ inch high lettering. - ✔✔A. 3
B. 2
C. 2 1/2
D. 1
E. 1 1/2
Answer B
✔✔38. Tanks that once where declared clean of fule oil could still again some time later
show sighnes of containing fule oil. - ✔✔True/ False
True
✔✔39. Tanks should be tested for flammable liquids before they are _____________. -
✔✔A. Denigrated
B. Dispelled
C. Transported
D. A and B
Answer C
✔✔40. What are the three things that must be present in order for the fire triangle to
work - ✔✔Answer Oxygen, fuel, source of ignition
✔✔41. In an oil tank is it the fuel oil that is burning or the vapors that are floating above
it. - ✔✔A. Fuel Oil
B. Vapors
Answer Vapors
✔✔42. What are the factors that are important in combustion. - ✔✔A. Flammability
range
B. Flammability compatibility
C. Ignition Temperature
D. Ignition Potency
E. Flash point
F. Flash extortion
G. A,C,E
H. B,D,F
Answer G
✔✔43. What is ignition temperature - ✔✔answer
ignition temperature is the minimum temperature to chich a substance in air must be
heated in order to initiate or cause self sustained combustion independent of the
heating element.
ANSWERS GRADED A+
✔✔30. When using water for vapor freeing what is one reason that this method may
become prohibited. - ✔✔A. The high cost of water
B. Treatment/disposal
C. Transportation of the water
D. All of the above
Answer B
✔✔31. During the prossess of water filling a tank exessive amounts of flammable
vapors will be expleed throught the fill opping. What is one way to temporarily minimize
the escape. - ✔✔A. Temporarily cap the oppening
B. Using an educator type air mover
C. Fill the tank slowly
D. A and C
Answer A
✔✔32. Steam can be used to clean and vapor-free a tank. However, a large
___________ _______________ can build up on the nozzle of the steam jet. This can
make steam cleaning dangerouse and if other meathoses are avalable steam purging
should be avoided. - ✔✔A. Explosive detonation
B.
✔✔33. The tank atmosphere and the excavation area should be regularly tested why.
for flammable or combustible vapor - ✔✔Answer
For flammable or combustible vapor
✔✔34. What device should be used to test the tank - ✔✔Combustible gas indicator
probe into the fill opening at the bottom
✔✔35. Readings ______% or less of the lower flammable limit must be obtained before
the tank is considered safe for removal from the ground. - ✔✔20%
Answer
✔✔36. Thanks should be labeled after removal from the ground but prior to removal
from the ______________ - ✔✔A. Site
B. Abnegation
C. Cleve
D. None of the above
Answer A
, ✔✔37. Warning of certain types of reuse. The former content and present vapor state of
each tank including vapor-freezing treatment and date should be written on the tank in
_____ inch high lettering. - ✔✔A. 3
B. 2
C. 2 1/2
D. 1
E. 1 1/2
Answer B
✔✔38. Tanks that once where declared clean of fule oil could still again some time later
show sighnes of containing fule oil. - ✔✔True/ False
True
✔✔39. Tanks should be tested for flammable liquids before they are _____________. -
✔✔A. Denigrated
B. Dispelled
C. Transported
D. A and B
Answer C
✔✔40. What are the three things that must be present in order for the fire triangle to
work - ✔✔Answer Oxygen, fuel, source of ignition
✔✔41. In an oil tank is it the fuel oil that is burning or the vapors that are floating above
it. - ✔✔A. Fuel Oil
B. Vapors
Answer Vapors
✔✔42. What are the factors that are important in combustion. - ✔✔A. Flammability
range
B. Flammability compatibility
C. Ignition Temperature
D. Ignition Potency
E. Flash point
F. Flash extortion
G. A,C,E
H. B,D,F
Answer G
✔✔43. What is ignition temperature - ✔✔answer
ignition temperature is the minimum temperature to chich a substance in air must be
heated in order to initiate or cause self sustained combustion independent of the
heating element.
