U1 Underground Storage Tank Installation &
Retrofitting Study Guide | Safety, Testing &
Inspection Practice Questions
2026/2027
, What does NFPA 30 cover? Liquid classification, tank location/cover, venting, tank openings, piping
installation/testing, and fire-code requirements.
What is the purpose of PEI/RP100-20? It provides guidelines for UST installation including excavation, bedding, backfill,
anchoring, piping, corrosion protection, and initial testing.
What should you memorize first according to the Master The 'Master Numbers' near the end of the guide.
Study Guide?
What is the flash point of Class IA liquids? Below 73°F.
What is the boiling point range for Class IB liquids? Below 73°F and 100°F or higher.
What is the oxygen-deficient threshold for safety? Less than 19.5% O₂.
What is the key point of the fire triangle? Fuel + Oxygen + Ignition.
What is the gasoline flash point? Approximately 45°F.
What is the required tank-to-tank spacing according to 2 feet.
PEI/RP100-20?
What is the minimum bedding requirement for tanks? 1 foot.
What should be done before entering a confined space? Plan, isolate hazards, test atmosphere, ventilate, use required PPE, continuously
monitor, maintain communication, and prepare rescue procedures.
What is the maximum pressure for a single-wall tank air 3-5 psig; do not exceed 5 psig.
test?
What is the bonding requirement? Object to object.
What is the grounding requirement? Object to earth.
What is the purpose of purging in safety procedures? To reduce fuel concentration.
Retrofitting Study Guide | Safety, Testing &
Inspection Practice Questions
2026/2027
, What does NFPA 30 cover? Liquid classification, tank location/cover, venting, tank openings, piping
installation/testing, and fire-code requirements.
What is the purpose of PEI/RP100-20? It provides guidelines for UST installation including excavation, bedding, backfill,
anchoring, piping, corrosion protection, and initial testing.
What should you memorize first according to the Master The 'Master Numbers' near the end of the guide.
Study Guide?
What is the flash point of Class IA liquids? Below 73°F.
What is the boiling point range for Class IB liquids? Below 73°F and 100°F or higher.
What is the oxygen-deficient threshold for safety? Less than 19.5% O₂.
What is the key point of the fire triangle? Fuel + Oxygen + Ignition.
What is the gasoline flash point? Approximately 45°F.
What is the required tank-to-tank spacing according to 2 feet.
PEI/RP100-20?
What is the minimum bedding requirement for tanks? 1 foot.
What should be done before entering a confined space? Plan, isolate hazards, test atmosphere, ventilate, use required PPE, continuously
monitor, maintain communication, and prepare rescue procedures.
What is the maximum pressure for a single-wall tank air 3-5 psig; do not exceed 5 psig.
test?
What is the bonding requirement? Object to object.
What is the grounding requirement? Object to earth.
What is the purpose of purging in safety procedures? To reduce fuel concentration.
