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ICC DECOMMISSIONING (U2) 2025 BRAND
NEW ACTUAL EXAM WITH ANSWERS.
When using dry ice to inert a tank you should never? - correct
answer-put dry ice in drop tube.
1.5 Ibs of dry ice should be used for? - correct answer-each 100
gallons of tank capacity.
A tank is never safe to remove unless the oxygen reading is? -
correct answer-5% or lower
When using dry ice crush up remove all plugs except vent and
evenly distribute then re install all plugs but leave vent open. -
correct answer-
When inerting a tank with nitrogen. - correct answer-allow gas to
flow into bottom of tank at a slow rate. Bond ground bottle
, Page | 2
When inerting a tank with nitrogen a pressure gauge should be
installed to make sure pressure does not exceed - correct
answer-5psi
When inerting a tank what meter should be used? - correct
answer-oxygen indicator 5% or less oxygen present befor
removal
When purging a tank what meter should be used? - correct
answer-combustible gas indicator (CGI) LEL reading below 10%
before removal
When cleaning a ust it should? - correct answer-remain in the
excavation
Before placing tanks in storage.
Tanks should be? - correct answer-cleaned (all liquids/ residue
and vapor freed
Tank openings tightly plugged/ capped, with one plug having a
1/8" vent hole.
Vent hole should be at highest point on the tank.
Label all tanks.
ICC DECOMMISSIONING (U2) 2025 BRAND
NEW ACTUAL EXAM WITH ANSWERS.
When using dry ice to inert a tank you should never? - correct
answer-put dry ice in drop tube.
1.5 Ibs of dry ice should be used for? - correct answer-each 100
gallons of tank capacity.
A tank is never safe to remove unless the oxygen reading is? -
correct answer-5% or lower
When using dry ice crush up remove all plugs except vent and
evenly distribute then re install all plugs but leave vent open. -
correct answer-
When inerting a tank with nitrogen. - correct answer-allow gas to
flow into bottom of tank at a slow rate. Bond ground bottle
, Page | 2
When inerting a tank with nitrogen a pressure gauge should be
installed to make sure pressure does not exceed - correct
answer-5psi
When inerting a tank what meter should be used? - correct
answer-oxygen indicator 5% or less oxygen present befor
removal
When purging a tank what meter should be used? - correct
answer-combustible gas indicator (CGI) LEL reading below 10%
before removal
When cleaning a ust it should? - correct answer-remain in the
excavation
Before placing tanks in storage.
Tanks should be? - correct answer-cleaned (all liquids/ residue
and vapor freed
Tank openings tightly plugged/ capped, with one plug having a
1/8" vent hole.
Vent hole should be at highest point on the tank.
Label all tanks.
