Which of the following actions is NOT recommended when operating a pump?

Greasing a pump while it is running is not a recommended practice in pump operation due to safety and operational concerns. When a pump is in operation, there is the potential for moving parts to create hazardous conditions. Applying grease while the pump is running could lead to contamination of the grease with process fluids or debris, which can affect the performance of the pump lubricants. Additionally, there's a risk of injury since the pump may have high-pressure areas or parts that can cause harm if proper precautions are not observed.

In contrast, the other actions are considered good practices in pump operation. Monitoring the discharge pressure is essential for ensuring the pump is operating within its design parameters and can help detect issues early. Adjusting the flow rate should be done cautiously and is typically performed only when necessary to respond to changing system demands, ensuring you maintain efficiency and prevent damage. Checking for abnormal noises is also important, as it can indicate mechanical issues that may require troubleshooting before they lead to more significant failures. Therefore, the recommended practices promote safety and maintain optimal pump performance.