ICC AST INSTALLATION AND
RETROFITTING CERTIFICATION
EVALUATION 2026 EXAM Q&A STUDY
SHEET
◉pressure vacuum vents remain normally closed, only opened when
the pressure inside the tank reaches? 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. 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? 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? 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?
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? 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? 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? Answer: 6" above the surrounding
ground surface.
◉Saddle supports for horizontal tanks may be constructed of?
Answer: Steel or reinforced concrete and must be installed on a firm
and suitable foundation.
RETROFITTING CERTIFICATION
EVALUATION 2026 EXAM Q&A STUDY
SHEET
◉pressure vacuum vents remain normally closed, only opened when
the pressure inside the tank reaches? 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. 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? 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? 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?
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? 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? 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? Answer: 6" above the surrounding
ground surface.
◉Saddle supports for horizontal tanks may be constructed of?
Answer: Steel or reinforced concrete and must be installed on a firm
and suitable foundation.
