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.