UST Tank Installation & Closure Procedures 2

Question 1

What is the primary purpose of a spill bucket (spill containment manhole) installed at the fill port of a UST?

Accepted Answer

To contain product spilled during tank filling operations

Answer

Spill buckets are designed to capture product that overflows or drips from the delivery hose connection during tank filling, preventing releases to the environment.

Question 2

An overfill prevention device set to trigger at 90% tank capacity performs which action?

Accepted Answer

Closes a valve to restrict or stop product flow into the tank

Answer

A flow-restrictor (float valve) type overfill prevention device closes at 90% capacity, stopping or significantly reducing product flow to prevent the tank from overfilling.

Question 3

During UST installation, what minimum slope is generally required for gravity-return (suction) piping back toward the tank?

Accepted Answer

1/4 inch per foot

Answer

Suction piping must slope back to the tank at a minimum of 1/4 inch per foot so product drains back into the tank when the pump shuts off, reducing leak risk.

Question 4

What must be installed on all vent pipes of a UST system to prevent vapor ignition?

Accepted Answer

Flame arrestors

Answer

Flame arrestors are installed on UST vent pipes to prevent a flame from traveling through the vent line into the vapor space of the tank.

Question 5

When installing double-walled piping, the interstitial space between the inner and outer pipe serves what purpose?

Accepted Answer

Allows detection of leaks from the inner pipe before product reaches the environment

Answer

The interstitial space of double-walled piping acts as secondary containment; sensors in this space detect leaks from the inner pipe before product can reach the soil or groundwater.

(UST) Underground Storage Tank Certification Practice Test

(UST) Underground Storage Tank Certification Practice Test

UST Tank Installation & Closure Procedures 2