When conducting wholesale testing, how long must you drain a prover after the flow becomes a trickle?

In the context of wholesale testing, the requirement to drain a prover until flow becomes a trickle for a specified duration is crucial for ensuring accurate measurements and proper system operation. The standard practice, as outlined in industry guidelines, dictates that after the flow reduces to a trickle, the prover must be drained for 30 seconds. This allows any remaining product in the prover to exit and ensures that the volume being measured is as precise as possible.

Draining for 30 seconds after the flow diminishes to a trickle enables adequate removal of the last residues of liquid, which could otherwise lead to inaccuracies in measurement and reporting. This practice helps confirm that any volume readings taken are consistent and reflective of the actual flow conditions during testing.

Other time durations, like 15 seconds, 1 minute, or 2 minutes, do not align with these established procedures. Therefore, the correct duration of 30 seconds serves as an important operational guideline in wholesale testing to uphold the integrity of measurement verification processes.