Six Ways to Simplify Fluid Transfer

To pump viscous fluids

  • Choose tubing at least two sizes larger than the flow size required.
  • Keep motor speed <300 rpm; the slower the motor, the better the flow.
  • Use adjustable occlusion pumps:

Over-occlude to prime pump;

reduce occlusion for longer life.

To increase tubing life

  • Run larger tube sizes at slower speeds.
  • Reduce occlusion.
  • Select longer-life material.
  • Reduce pressure in system.
  • Stop pump periodically, move tubing 20-25 cm (8-10 in) forward.

To reduce pulsation

  • Use pulse dampener.
  • Use adjustable occlusion pump.
  • Reduce occlusion and apply back pressure.
  • Use dual heads with offset rollers.
  • Add extra discharge tubing to system.
  • Run smaller tube sizes at higher speeds.

To pump abrasive fluids

  • Keep soft particle sizes <25% of tube ID.
  • Keep hard particle sizes <5% of tube ID.
  • Keep motor speed <300 rpm.
  • Use adjustable occlusion pumps:

To check tubing compatibility

  • See chemical compatibility charts
  • Always pretest unknown chemicals
  • Immersion test recommended:
  1. Cut samples of tubing.
  2. Weigh and measure length and diameter.
  3. Immerse for 48 hours in a closed vessel.
  4. Examine tubing for swelling, brittleness, cracking, softness, and other forms of deterioration.
  5. Weigh and measure length and diameter.
  • If tubing does not change, try it in your pump.