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ICC AST Installation- Retrofitting Questions and Answers Rated A+
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ICC AST Installation- Retrofitting Questions and Answers Rated A+ 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 ...

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  • September 7, 2024
  • 5
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • icc ast installation retrofitting questions and a
  • to allow passage between tanks for inspection prov
  • pressure vacuum vents remain normally closed only
  • operating design pressure shop built tanks are

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ICC AST Installation- Retrofitting
Questions and Answers Rated A+


to allow passage between tanks for inspection provide a minimum of? - answer1/6 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? - answer2 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? - answer2" 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? - answerthe 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? - answer2 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? - answerIt 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? - answer12" beyond the perimeter
of the tank.

to provide drainage and settlement the surface of which the tank bottom rests should be
at least? - answer6" above the surrounding ground surface.

Saddle supports for horizontal tanks may be constructed of? - answerSteel or reinforced
concrete and must be installed on a firm and suitable foundation.

, Fire codes require that tank saddles are? - answerhigher 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. -
answer

Reinforced concrete slabs are 6 to 12 inches thick and constructed to meet 28 day,
minimum 3,000 psi strength requirement. - answer

when grounding a tank use #4 solid or stranded cable. - answeruse #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? -
answer30"

normal tank vent should extend not less then? - answer12' 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. - answer

enclosed wiring within class 1 division 1 areas must use a maximum 3' long of explosion
proof flexible fittings. - answer

Access manways that are intended for personal entry into a tank must be at least 24"
diameter. - answer

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. - answerplace 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 - answer

galvanic anode installation. - answerremove 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 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. - answer

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