tech tips

Pumps

Best Practices for ANSI Pumps

Selection

  • Operate pumps at 85% to 110% of best efficiency point (BEP).
  • Ensure NPSHA is 20% or 1.5m (5ft) over NPSHR, whichever is greater.
  • Impeller trims of 75% are optimal, so trim impellers 60% to 95% of maximum.
  • Consider using variable speed technology for multiple operating point conditions.

Installation

  • Level pump, base & motor, and ensure the area is free of soft foot conditions.
  • Provide at least 10 diameters of straight pipe to the pump’s suction inlet.
  • Use highly rigid baseplates, such as reinforced stilt or grout installed designs.
  • Utilize low shrink grout to install baseplates. Epoxy grout is superior.
  • Design piping to ensure minimum stress, i.e., fasteners should be installed without force.

Alignment

  • Use laser or reverse dial indicator technology to align pump & motor.
  • Align before and after the pump & piping are bolted together.
  • Consider using C-flange motor adapters when pumping fluids hotter than 95°C (200°F).
  • For pumping temperatures greater than 175°C (350°F) consider centerline mounted casing.

Operation

  • Refer to equipment operation & maintenance manuals for start-up procedures and checklists.
  • Slowly close process valves to avoid water hammer.
  • Consider soft start for frequent on-off duty pumps.
  • Avoid run-dry conditions.
  • Operate spare pumps at least every three months to maintain proper working conditions.

Preventive Maintenance

  • Change lubrication at recommended intervals.
  • Protect lubricant from contamination.
  • Maintain mechanical seal flush environment.
  • Predictive maintenance, vibration monitoring and lubricant analysis are beneficial practices.
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