TCFP Plans Examiner Practice Test

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Prepare for the TCFP Plans Examiner Test with flashcards and multiple choice questions, each offering hints and explanations. Get ready to excel on exam day!

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What is the minimum nominal inside diameter for vents used for underground storage tanks?

1 inch
1 1/4 inch
2 inches
3 inches

The correct answer is: 1 1/4 inch

The minimum nominal inside diameter for vents used for underground storage tanks is 1 1/4 inch. This specification is established to ensure adequate venting of vapors released during the filling and emptying of the tanks. Proper venting is crucial to prevent pressure buildup, which could lead to tank rupture or leaks, posing a risk to safety and the environment. Additionally, the size helps to mitigate potential back pressure and facilitates the escape of vapors, ensuring that the tank operates within safe parameters. Larger diameters, while not essential for all tank types, may offer benefits in certain conditions related to the rate of flow and vapor release but are not required by regulation to maintain safety standards. The specified diameter is a balance between functionality and compliance with regulations governing storage tank systems.