Standard drop tubes should allow for at least how many inches of clearance from the tank bottom to the highest point of the tube cut?

Standard drop tubes are critical components in underground storage tanks (USTs) as they direct the flow of liquid from the tank to the dispensing system and also help prevent sediment from entering the delivery system. It is essential to maintain an adequate clearance between the tank bottom and the drop tube to ensure the effective management of the tank's contents.

The recommended clearance of three inches from the tank bottom to the highest point of the tube cut is significant because it allows for sediment and water that may accumulate at the bottom of the tank to remain below the intake of fuel. This is essential for the proper functioning of the system, as sediment can cause clogs and contamination, leading to operational issues and potential environmental hazards.

Additionally, the three-inch clearance is a standard requirement as per various industry guidelines and best practices for UST installations. This standard helps ensure safe operations and mitigates the risk of introducing impurities into the fuel during dispensing.

The specific clearance requirements vary across different jurisdictions, and while some options may suggest higher clearances, the key point is that three inches is the minimum acceptable recommendation that balances effective operation with sediment management within the tank. This understanding of drop tube installation and clearance standards is vital for those involved in UST system installations and retrofitting to adhere to