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COMMISSIONING

Commissioning a centrifugal pump involves a structured process of pre-startup checks, priming, rotation verification, and performance testing to ensure safe and efficient operation.

Pre-Commissioning Inspections

• Cleanliness and Piping: Flush all suction and discharge lines to remove weld slag, dirt, or debris. Ensure pipes are connected without putting external stress on the pump flanges.
• Foundation and Grouting: Verify the baseplate is level and securely anchored to the concrete foundation.
• Alignment: Check pump-to-motor shaft alignment using a straight edge, dial indicator, or laser tool to prevent bearing and seal wear.
• Lubrication: Confirm that bearing housings and oilers are filled with the correct grade and level of lubricant.
• Mechanical Seals: Ensure shipping locks are removed, auxiliary flush plans are hooked up, and seal pressures are set

Startup and Operation

• Rotation Check: Disconnect the coupling or perform a quick “bump start” on the motor to verify that shaft rotation matches the arrow on the pump casing
• Priming: Fill the pump casing and suction line completely with liquid and vent any trapped air; never run a centrifugal pump dry
• Valve Positioning: Open the suction valve fully and close (or slightly crack) the discharge valve to minimize initial motor overload
• Running the Pump: Start the motor and immediately open the discharge valve smoothly to the desired flow rate. Do not run against a completely closed discharge valve for more than a few seconds to 20 seconds maximum to prevent overheating