Exam (elaborations)
U1 UST INSTALLER / RETROFITTERS EXAM
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U1 UST INSTALLER / RETROFITTERS EXAM ...
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U1 UST INSTALLER / RETROFITTERS EXAM2024-2025
when a bottom hold-down pad is placed beneath a steel tank. - ANSWER: The
bedding material may be lowered to 6".
Cover in vehicle-trafficked areas with 30" compacted backfill and 6" of asphaltic
concrete, or 18" of compacted backfill and 6 to 8" of reinforced concrete. Paving
over tanks in traffic areas should extend one foot beyond the tank border.
- ANSWER
Cover in non-traffic areas should be at least 2' thick, with a minimum of 1' of
backfill covered in filter fabric and 1' of soil. - An appropriate alternative is 1' of
backfill material and at least 4" of reinforced concrete or 6" of asphalt pavement.
The maximum burial depth for fibreglass tanks is 7'.
What is the burial depth for steel tanks? ANSWER 5'
To establish a sturdy foundation, place tanks on at least...... of backfill - ANSWER
1' thick, extending 1' beyond the ends and sides of the tank.
How many feet of backfill are necessary between adjacent tanks, tanks, and
excavation walls? - Answer 2'
Excavating material must be stockpiled at least..... from the tank - ANSWER 2'
What is the allowable size for pea gravel backfill? - ANSWER 3/4".
, What is the maximum allowable crushed rock backfill size? - ANSWER 1/2"
When sand is used for backfill, it must be compacted. Lifts - ANSWER 12 to 18"
lifts; compact after each lift. Repeat until the level reaches at least 60% of the tank's
vertical height.
When deadmen are used, where should they be placed? - ANSWER: Outside of the
tank's diameter.
What does a bottom hold-down pad consist of? - ANSWER 8" of reinforced
concrete that extends at least 8" beyond the tank edges and 1 foot beyond each end.
What should the hold down straps for steel tanks be? - ANSWER: Nonmetallic or
flat steel. The use of wire ropes or round bar is not permissible.
What about electrical isolation for straps on steel and composite tanks? - ANSWER
nonmetallic, totally enclosed, or isolated with material inserted between the straps.
The isolating material should be at least 1/8" thick, broader than the strap, and
extend 1' beyond the widest point of the tank.
What are the ways for attaching straps to tanks? - ANSWER: Use anchor bolts,
turnbuckles, wire cable, and clamps to secure to anchor points.
Vent restriction devices should not be fitted. - ANSWER in ayatena storage units
fitted with suction pumps and air eliminators.
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