ICC AST Installation/ Retrofitting
UPDATED 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.
operating/ design pressure
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.
- CORRECT ANSWER -
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. -
CORRECT ANSWER -
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"
UPDATED 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.
operating/ design pressure
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.
- CORRECT ANSWER -
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. -
CORRECT ANSWER -
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"
