What is the minimum test draft for a vehicle tank meter during a normal test?

The minimum test draft for a vehicle tank meter during a normal test is determined to ensure that the meter provides accurate measurements under conditions that reflect actual usage. The choice stating "1 minute or 50 gallons, whichever is greater" is correct because it establishes a baseline for the testing process that accommodates both the time of operation and the volume of liquid being dispensed.

This requirement ensures that the meter is tested under sufficient flow conditions to accurately reflect its performance capabilities. Testing for a duration of at least one minute allows for a robust assessment of the meter's functionality over time, while the condition of measuring at least 50 gallons ensures that the testing leverages a substantial volume, thus minimizing the potential for measurement errors that can occur with very small quantities.

By stipulating "whichever is greater," the standard ensures flexibility; if the maximum discharge rate is low and doesn't reach 50 gallons in one minute, the test will still require a sufficient duration to fully assess the accuracy of the meter. This helps to identify and mitigate any discrepancies in measurement accuracy that may not be apparent with either a very short test period or a very small volume of fluid measured.

Other options provide either a fixed volume or time that may not cover the scenarios where a greater evaluation is necessary,