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ICC AST Installation_ Retrofitting WITH 100- SURE ANSWERS
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ICC AST Installation_ Retrofitting WITH 100- SURE ANSWERS
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10/3/24, 4:47 AMEUNICE
ICC AST Installation/ Retrofitting WITH 100% SURE
ANSWERS
Terms in this set (62)
to allow passage between tanks for 1/6 of the sum of the adjacent tank diameters, but not less then 3 feet.
inspection provide a minimum of?
pressure vacuum vents remain normally 2 through 16 ounces per square Inch or a vacuum of 0.5 through 1.0 ounces per square
closed, only opened when the pressure inch.
inside the tank reaches?
the primary criterion for tank foundation this ranges from 1,000 pounds per square foot for soft clay or 4,000 for coarse,
design is the allowable bearing pressure of compacted gravel
soil.
nominal vent must be at least? 2" nominal pipe size.
operating/ design pressure the pressure setting of the venting device. usually 2 ounces to 1 pound per square inch
above atmospheric 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?
pressure/ vacuum vents remain normally 2 through 16 ounces per square inch or a vacuum of 0.5 through 1.0 ounces per square
closed only when the pressure in the tanks inch.
reaches a predetermined pressure setting
of?
in order for air to enter a tank during liquid It is at least 1 ounce below atmospheric pressure.
withdrawal the internal tank pressure must
be reduced to a pont where?
A suitable foundation for vertical tanks can 12" beyond the perimeter of the tank.
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?
1/5
, 10/3/24, 4:47 AM
to provide drainage and settlement the 6" above the surrounding ground surface.
surface of which the tank bottom rests
should be at least?
Saddle supports for horizontal tanks may be Steel or reinforced concrete and must be installed on a firm and suitable foundation.
constructed of?
higher than 12" above the foundation. have a minimum fire rating of 2 hours and be
Fire codes require that tank saddles are?
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 use #12 TW or THHN thin stranded or solid wire to bond components
stranded cable.
the minimum opening in a vault for personal 30"
entry should be a diameter of at least?
12' above the general grade level and be located at least 5 feet from building openings.
normal tank vent should extend not less
emergency vents may discharge inside vault but must remain vapor tight during normal
then?
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 place anodes 3 to 5 feet from piping and 2 to 3 feet below grade but outside of the
tank bottoms the anodes should be 1' piping trench in native soil.
outside the tank perimeter and at least 18"
lower than the tank bottom. Anodes may be
placed horizontally or vertically.
If lifting a tank make sure that the angle
between the chain and vertical does not
exceed 30 degrees
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
galvanic anode installation.
backfill material. test the electrical continuity of the anode and attached lead wire
without damaging the packing material.
Backfill anodes with compacted native soil
and soak them with 3 to 5 gallons of water a
minimum of 2 and anodes should be
installed.
Galvanic anodes should be located outside do not handle anodes by the lead wire.
the piping trench and backfilled with native
soil. anode wires or attached to piping by
thermite welding if no flammable or
combustible liquids are present, or with
mechanical clamps
2/5
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