Which of the following is a key operational guideline for chemical feed pumps?

Ensuring valves are in the appropriate positions before starting a chemical feed pump is crucial for safe and efficient operation. This guideline helps prevent leaks, equipment damage, and possible hazardous situations that could arise if chemicals were to flow incorrectly or uncontrollably. Improper valve positioning can lead to backflow, over-pressurization, or inadequate chemical dosing, which can ultimately affect the system's performance and safety.

In addition, checking valve positions contributes to the proper mixing and distribution of chemicals in the treatment process, facilitating the desired chemical reactions and ensuring that effluent meets regulatory standards. This practice is part of a broader strategy of precautionary measures that operators should implement before commencing operations with chemical feed pumps to maintain safety and efficiency in chemical management systems.