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A typical UST system contains how many pieces of equipment?
One of the following images shows the emergency shut-off switch, also known as the E-Stop button, that C operators use to shut down the fueling system.
In the event of an emergency such as a fire or major release, the first thing C operators should do is activate the emergency shut-off switch, which disables all pumps and electrical equipment at the fuel islands to prevent the flow of fuel.
Tank Access Points Facilitate 5 Major Functions:
4. Fuel Is Pumped to Dispensers
5. Interstitial Monitoring
What is this UST Equipment? Click on each image to find out.
The Flapper Valve is how fuel enters the UST during a fuel delivery. The EPA requires USTs filled with more than 25 gallons of product at one time to have overfill prevention, shown here as the valve near the top of the tube. As the UST reaches capacity, the valve automatically closes and prevents the tank from overfilling and causing a release.
The Submersible Pump inside a UST pushes the fuel from the storage tank so that it may flow via underground piping to a fuel dispenser for distribution.
Automatic Tank Gauge (ATG) Probes collect information about inventory levels, water levels, leaks and more inside the UST. The ATG Console displays the readings that the ATG collects. An ATG Probe is recognizable by the floats on the probe.
CORRECT! Stage I Vapor Recovery is performed to reduce hydrocarbon emissions. During a gasoline delivery, fuel flows into the underground storage tank from the delivery truck. The incoming fuel displaces the vapors in the UST. The delivery truck hooks a hose to the UST’s Stage I Vapor Adaptor and collects the gasoline vapors from inside the Underground Storage Tank. This prevent the vapors from venting into the atmosphere.
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Double-walled tanks are essentially a tank within a tank. The “interstitial space” between the two tank layers (also known as an interstice) is designed to prevent a leak from the inner tank releasing into the environment. A sensor is placed in the interstitial space at the bottom of the tank that will send alerts to the ATG if either of the two layers of the tank fails (groundwater leaks into the tank, or fuel leaks out of the primary tank). Since you need two layers to create an interstitial space, interstitial monitoring of the walls of an underground storage tank is not possible with a single-wall UST.
