Why does an inspector carry out the drainage test on a bulk volume meter?

An inspector carries out the drainage test on a bulk volume meter to ensure that the meter is functioning properly and accurately measuring the volume of liquid passing through it. The drainage test helps to verify that there are no leaks or blockages in the meter that could affect its accuracy. By conducting this test, the inspector can confirm that the meter is providing reliable and accurate measurements, which is essential for billing purposes and ensuring fair and accurate distribution of resources.

An inspector carries out a drainage test on a bulk volume meter to ensure that the meter does not retain any entrained air, which could lead to measurement errors. When a bulk volume meter is filled, any air bubbles present can become trapped in the meter, causing the meter to over-register the volume of liquid passing through it. The drainage test involves draining the meter completely and then refilling it, while observing the level of liquid in the meter's sight glass. If no air bubbles are present, the level of liquid in the sight glass will be stable and consistent, indicating that the meter is properly drained and ready for use.