ICC AST Installation/ Retrofitting
QUESTION AND ANSWERS
to allow passage between tanks for inspection provide a minimum of? - -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? - -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. - -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? - -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? - -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? - -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? - -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? - -
12" beyond the perimeter of the tank.
---
-to provide drainage and settlement the surface of which the tank bottom
rests should be at least? - -6" above the surrounding ground surface.
, -Saddle supports for horizontal tanks may be constructed of? - -Steel or
reinforced concrete and must be installed on a firm and suitable foundation.
-Fire codes require that tank saddles are? - -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. - -
-when grounding a tank use #4 solid or stranded cable. - -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? - -30"
-normal tank vent should extend not less then? - -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. - -
-When using galvanic cathotic protection for tank bottoms the anodes should
be 1' outside the tank perimeter and at least 18" lower than the tank bottom.
Anodes may be placed horizontally or vertically. - -place anodes 3 to 5 feet
from piping and 2 to 3 feet below grade but outside of the piping trench in
native soil.
-If lifting a tank make sure that the angle between the chain and vertical
does not exceed 30 degrees - -
-galvanic anode installation. - -remove and discard any waterproof packaging
and inspect the anodes for shipping and and handling damage. verify anode
is centered in the prepackaged low-resistivity backfill material. test the
QUESTION AND ANSWERS
to allow passage between tanks for inspection provide a minimum of? - -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? - -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. - -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? - -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? - -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? - -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? - -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? - -
12" beyond the perimeter of the tank.
---
-to provide drainage and settlement the surface of which the tank bottom
rests should be at least? - -6" above the surrounding ground surface.
, -Saddle supports for horizontal tanks may be constructed of? - -Steel or
reinforced concrete and must be installed on a firm and suitable foundation.
-Fire codes require that tank saddles are? - -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. - -
-when grounding a tank use #4 solid or stranded cable. - -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? - -30"
-normal tank vent should extend not less then? - -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. - -
-When using galvanic cathotic protection for tank bottoms the anodes should
be 1' outside the tank perimeter and at least 18" lower than the tank bottom.
Anodes may be placed horizontally or vertically. - -place anodes 3 to 5 feet
from piping and 2 to 3 feet below grade but outside of the piping trench in
native soil.
-If lifting a tank make sure that the angle between the chain and vertical
does not exceed 30 degrees - -
-galvanic anode installation. - -remove and discard any waterproof packaging
and inspect the anodes for shipping and and handling damage. verify anode
is centered in the prepackaged low-resistivity backfill material. test the
