Guideline of Tube Selection

In choosing the right tubing for your application there are several factors to consider. Listed to the right are questions which will help direct you in the selection of the proper tubing for your specific application. It is required to test tubing under the actual service conditions prior to specifying a particular tubing formulation. Assistance in tubing selection is available from our worldwide network of authorized tubing distributor. You may also obtain detailed information on how to select tubing against different chemicals from our chemical compatibility guideline. For more details get in contact whith a technical person from Innovapure.

Things to consider when selecting a peristaltic tubing?

• Deliver aggressive liquid or organic solvent: Use the chemical compatibility table from the link below to choose the right material.
• When working with suction lift or pressure: Select tubing with thicker wall thickness.
• Viscous liquids: Select tubing with thicker wall thickness and bigger inner diameter.
• High precision requirement: Select the tubing with the smallest inner diameter that can meet the flow rate requirement.
• If precision requirement is not very high: Select tubing with bigger inner diameter to decrease the speed of the drive which can decrease the wear of the tubing and prolong the service life of the tubing.
• Tubing bears pressure: Thinner wall thickness bears less pressure. Tubing with bigger inner diameter bears less pressure than tubing with smaller inner diameter with the same wall thickness. The pressure bearing ability in intermittent conditions is better than in continuous conditions.

Chemical resistance of tubing

• You may also obtain detailed information on how to select tubing against different chemicals from our chemical compatibility guideline
• You should always test the tubing with your chemicals before using it in your production. Temperature, pressure and concentrations can affect the shelf life. It is user's duty to judge suitability of tubing purchased.

Factors which influence the flow rates

• Viscosity: The maximum viscosity a peristaltic pump can handle is about 2000 cps. The higher the viscosity, the lower the flow rate. It is recommended to use a tubing with a wall thickness of 2.4 mm or larger and a larger inner diameter than if you were pumping water. 
• Suction Lift: A suction lift exists when the liquid is taken from an open to atmosphere tank where the liquid level is below the centerline of the pump suction. The higher the suction lift, the lower the flow rate. When the suction lift is more than 2 meters it will influence the flow rate noticeably.
• Delivery Lift: The higher the delivery lift, the lower the flow rate. The delivery lift influence the flow rate less than the suction lift.
• Tubing: New tubing has higher flow rate than older worn tubing.
• The flow rate is linear with the revolution per minute of the drive. If the rpm increases 1 time, the flow rate increases approximately 1 time. 

Choose the tubing size according to your flow requirements

• Under each peristaltic pump you will find a table with tubing sizes and flow rates which makes it easier for you to choose the apropriate tubing size. 
• Refer to below table to decide Tubing specifications: WT - wall thickness; ID - inner diameter; OD - outer diameter.