Guides are available for different peristaltic pump tubes against a long list of media however, it is almost always recommended to perform a dynamic test with the tube installed in the peristaltic pump under the regular conditions of the application. The final critical element to the choice of tube to be used in a peristaltic pump is chemical compatibility. For this reason, special thermoplastic elastomers have been developed as peristaltic pump tubing which remain highly elastic over a long operation life. If not designed for operation in a peristaltic pump, a tube will suffer fatigue as elasticity is lost, the tube will flatten and flow performance reduces. During this time, each part of the tube is compressed over 72 million times.
Consider a peristaltic pump running at 300 rpm with 4 rollers for 6 weeks continuously. This is determined by the elasticity of the tube. As the rollers pass over the tube it is vital for the function of the peristaltic pump that the tube re-opens once the rollers move away. For example, the 9QQ peristaltic pump is designed for internal diameter tube of 0.5 mm to 3.5 mm and always with a wall thickness of 1.0 mm.Īs described in the introduction, a peristaltic pump operates by compressing a tube around a partial circumference of the pump’s body. This data is provided in the datasheets and it is not recommended to operate the peristaltic pump outside this range. Secondly, a peristaltic pump is designed to operate within a range of internal diameters of a tube. Within the Boxer range, this is either 1.0 mm, 1.6 mm or 2.4 mm. Therefore, a peristaltic pump is designed for a particular wall thickness of a tube. The peristaltic pump must therefore be designed so that the gap between the rollers and pump body is less than twice the wall thickness of the tube – otherwise occlusion will not occur, and the pump will be very ineffective.
As the rollers move over the tube they compress and occlude the tube.
3 factors of the most important factors are discussed below:Īn obvious starting point is that the tube needs to be correctly dimensioned for a particular peristaltic pump. The choice of tubing to be used for a peristatic pump is critical to meet the needs of both the peristaltic pump itself and the application.
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