During which test should parallel and angular alignment of the pump and driver be checked?

• A. Annual
• B. Monthly
• C. Weekly
• D. Daily

Answer: (A)

Maintaining proper alignment between the pump and its driver is essential to prevent excessive vibration, bearing and seal wear, and reduced efficiency. Parallel alignment (how much the shafts are offset) and angular alignment (the shaft angles relative to each other) must be within tolerance to keep the coupling functioning smoothly.

These alignment checks are typically performed during the annual test because that is when a comprehensive mechanical inspection and performance verification are done. It’s the time to confirm that the entire drive system is in spec after installation, major maintenance, or a period of operation. Daily or weekly checks focus more on operating conditions like flow, pressure, temperature, and basic belt or coupling condition, rather than confirming precise shaft alignment, which can drift due to foundation settling, thermal growth, or after disassembly. After alignment is corrected, it should be re-tightened and rechecked to ensure the fix holds.

So, checking parallel and angular alignment during the annual test aligns with conducting a full, scheduled verification of the pump-drive system’s mechanical condition.