Is it permissible for the tank agitator to run while measuring with a sight tube?

The correct answer highlights an important procedural safety and accuracy measure in the operation of tanks and measurement devices. When using a sight tube to measure the liquid levels or volumes in a tank, having the tank agitator running can lead to inaccuracies in measurement. The agitation can cause turbulence, which disturbs the fluid in the tank, making it difficult to obtain a stable and reliable reading from the sight tube.

By ensuring that the agitator is not running during measurements, one can achieve a calm liquid surface, leading to a more precise and dependable measurement. This practice is crucial in ensuring compliance with standards and protocols that are often established to guarantee the safety and accuracy of measurements in sampling and weighing processes.