ICC AST Installation/ Retrofitting
UPDATED ACTUAL Questions and
CORRECT Answers
to allow passage between tanks for inspection provide a minimum of? - CORRECT
ANSWER - 1/6 of the sum of the adjacent tank diameters, but not less then 3 feet.
pressure vacuum vents remain normally closed, only opened when the pressure inside the tank
reaches? - CORRECT ANSWER - 2 through 16 ounces per square Inch or a vacuum of
0.5 through 1.0 ounces per square inch.
the primary criterion for tank foundation design is the allowable bearing pressure of soil. -
CORRECT ANSWER - this ranges from 1,000 pounds per square foot for soft clay or
4,000 for coarse, compacted gravel
nominal vent must be at least? - CORRECT ANSWER - 2" nominal pipe size.
shop built tanks are designed for operating pressures between atmospheric and 1.0 psig. in order
for air and vapor to be expelled from a tank during filling, the internal pressure must increase to
at least? - CORRECT ANSWER - the pressure setting of the venting device. usually 2
ounces to 1 pound per square inch above atmospheric pressure.
pressure/ vacuum vents remain normally closed only when the pressure in the tanks reaches a
predetermined pressure setting of? - CORRECT ANSWER - 2 through 16 ounces per
square inch or a vacuum of 0.5 through 1.0 ounces per square inch.
in order for air to enter a tank during liquid withdrawal the internal tank pressure must be
reduced to a pont where? - CORRECT ANSWER - It is at least 1 ounce below
atmospheric pressure.
A suitable foundation for vertical tanks can be constructed with a finished course of clean,
compacted sand, gravel or crushed rock that is placed over the base course. The base and the
, Finnish courses should extend at least? - CORRECT ANSWER - 12" beyond the perimeter
of the tank.
to provide drainage and settlement the surface of which the tank bottom rests should be at least?
- CORRECT ANSWER - 6" above the surrounding ground surface.
Saddle supports for horizontal tanks may be constructed of? - CORRECT ANSWER -
Steel or reinforced concrete and must be installed on a firm and suitable foundation.
Fire codes require that tank saddles are? - CORRECT ANSWER - higher than 12" above
the foundation. have a minimum fire rating of 2 hours and be constructed of protected steel,
masonary or reinforced concrete. roofing felt or expansion joint is not an acceptable electrical
isolation for tank saddles.
Reinforced concrete slabs are 6 to 12 inches thick and constructed to meet 28 day, minimum
3,000 psi strength requirement. - CORRECT ANSWER -
when grounding a tank use #4 solid or stranded cable. - CORRECT ANSWER - use #12
TW or THHN thin stranded or solid wire to bond components
the minimum opening in a vault for personal entry should be a diameter of at least? - CORRECT
ANSWER - 30"
normal tank vent should extend not less then? - CORRECT ANSWER - 12' above the
general grade level and be located at least 5 feet from building openings. emergency vents may
discharge inside vault but must remain vapor tight during normal operation. Emergency shut off
switch must be located between 20 and 100 feet from the dispensers. enclosed wiring within
class 1 division 1 areas must use a maximum 3' long of explosion proof flexible fittings.
Access manways that are intended for personal entry into a tank must be at least 24" diameter. -
CORRECT ANSWER -
UPDATED ACTUAL Questions and
CORRECT Answers
to allow passage between tanks for inspection provide a minimum of? - CORRECT
ANSWER - 1/6 of the sum of the adjacent tank diameters, but not less then 3 feet.
pressure vacuum vents remain normally closed, only opened when the pressure inside the tank
reaches? - CORRECT ANSWER - 2 through 16 ounces per square Inch or a vacuum of
0.5 through 1.0 ounces per square inch.
the primary criterion for tank foundation design is the allowable bearing pressure of soil. -
CORRECT ANSWER - this ranges from 1,000 pounds per square foot for soft clay or
4,000 for coarse, compacted gravel
nominal vent must be at least? - CORRECT ANSWER - 2" nominal pipe size.
shop built tanks are designed for operating pressures between atmospheric and 1.0 psig. in order
for air and vapor to be expelled from a tank during filling, the internal pressure must increase to
at least? - CORRECT ANSWER - the pressure setting of the venting device. usually 2
ounces to 1 pound per square inch above atmospheric pressure.
pressure/ vacuum vents remain normally closed only when the pressure in the tanks reaches a
predetermined pressure setting of? - CORRECT ANSWER - 2 through 16 ounces per
square inch or a vacuum of 0.5 through 1.0 ounces per square inch.
in order for air to enter a tank during liquid withdrawal the internal tank pressure must be
reduced to a pont where? - CORRECT ANSWER - It is at least 1 ounce below
atmospheric pressure.
A suitable foundation for vertical tanks can be constructed with a finished course of clean,
compacted sand, gravel or crushed rock that is placed over the base course. The base and the
, Finnish courses should extend at least? - CORRECT ANSWER - 12" beyond the perimeter
of the tank.
to provide drainage and settlement the surface of which the tank bottom rests should be at least?
- CORRECT ANSWER - 6" above the surrounding ground surface.
Saddle supports for horizontal tanks may be constructed of? - CORRECT ANSWER -
Steel or reinforced concrete and must be installed on a firm and suitable foundation.
Fire codes require that tank saddles are? - CORRECT ANSWER - higher than 12" above
the foundation. have a minimum fire rating of 2 hours and be constructed of protected steel,
masonary or reinforced concrete. roofing felt or expansion joint is not an acceptable electrical
isolation for tank saddles.
Reinforced concrete slabs are 6 to 12 inches thick and constructed to meet 28 day, minimum
3,000 psi strength requirement. - CORRECT ANSWER -
when grounding a tank use #4 solid or stranded cable. - CORRECT ANSWER - use #12
TW or THHN thin stranded or solid wire to bond components
the minimum opening in a vault for personal entry should be a diameter of at least? - CORRECT
ANSWER - 30"
normal tank vent should extend not less then? - CORRECT ANSWER - 12' above the
general grade level and be located at least 5 feet from building openings. emergency vents may
discharge inside vault but must remain vapor tight during normal operation. Emergency shut off
switch must be located between 20 and 100 feet from the dispensers. enclosed wiring within
class 1 division 1 areas must use a maximum 3' long of explosion proof flexible fittings.
Access manways that are intended for personal entry into a tank must be at least 24" diameter. -
CORRECT ANSWER -
