Ice Cream Cone 18 Degrees,18 Degree Crispy Cone,Crispy Cone 18 Degrees,Crispy Cone Taper 18 Degrees Tianjin Yongkang Food Co., Ltd , https://www.yongkangfood.com
Peristaltic pumps are gaining popularity due to their pollution-free pumping characteristics and the need for less maintenance. However, when designing or purchasing a peristaltic pump system, many engineers often overlook an important component, the pump tube of a peristaltic pump.
I. Chemical compatibility The pipe must be chemically compatible with the fluid to be pumped in order to have good pumping performance and safety performance. With the increasing number of tubing on the market - some peristaltic pump models have up to 15 available tubing - so users can always find a suitable tubing that is chemically compatible with a particular fluid.
Many pump tube suppliers offer chemical compatibility tables. However, engineers should be aware that chemical compatibility tables specific to pump tubing should be used instead of chemical compatibility tables for common tubing. Because ordinary pipes have only general contact with chemicals, and peristaltic pump tubes are in contact with chemical fluids under pressure conditions, the chemical compatibility level of ordinary pipes cannot be equal to the chemical compatibility level of peristaltic pump tubes. Therefore, only the pump tube should be referred to, not the chemical compatibility level of the general pipeline and related materials, otherwise the pump tube will be ineffective or damaged and leaking, resulting in damage or dangerous accident of the pump.
* The end user should refer to the chemical compatibility table for each component of the solution, not just the main component, for compatibility verification with the pipe to be used. Some acids or solvents can cause enough damage to the pump tube even after a few hours or a few days of contact with the pump tube. * The end user should check each chemical in the solution to ensure it is compatible with the selected pump tubing.
Also keep in mind that the chemical resistance of the pump tube decreases with increasing temperature. Some chemicals do not affect the pump tube at room temperature, but when the temperature rises to a certain level, it will cause damage to the pump tube. Certain chemical conditions must be specified in the chemical compatibility table, especially temperature limits, to determine chemical compatibility.
If a chemical is not listed in the chemical compatibility table, or if the operating environment conditions of a plant differ too much from those specified in the table, a immersion test can be used to obtain more reliable information. This method can be used if there is no other information to refer to when determining chemical compatibility.
The immersion test procedure is as follows: Take a small pump tube and weigh it, measure the diameter and length. The pump tube was then placed in a closed container containing the relevant chemicals for 48 hours. The tube was taken out, washed and dried, weighed and measured, and the amount of change measured twice before and after was recorded. The pump tubing should also be inspected for signs of softening or embrittlement, which indicate that the chemical has caused damage to the pump tubing. A pumping test can be performed after one or several tubes are preselected. Each candidate pump tube sample should be put into trial operation under the actual environmental conditions of the factory, and the test results should be closely observed. If the pump tube does not show discoloration, swelling, cracking, loss of fluidity, or other signs of deterioration after the test run, it is proven to be compatible with the fluid.
Please remember that in order to select the appropriate pipe, whether it is to check the compatibility table, or to do the physical test, or to use the two methods together, the final responsibility should be borne by the end user. Careful analysis and testing can ensure correct test results, thus avoiding pump damage and ensuring personal and property safety.
The chemical compatibility between different pipes and solutions varies greatly. But there are also some materials that are extremely resistant to most chemicals. For example, Viton fluororubber pump tubing is resistant to a wide range of inorganic chemicals and even some organic chemicals. As another example, a polytetrafluoroethylene (PTFE) pump tube is compatible with almost all chemicals. However, the Teflon pump tubing is a rigid tubing that requires a dedicated pump head. In applications where a variety of corrosive chemicals are to be pumped, tubing that is resistant to a wide range of chemicals should be a good choice.
Second, the pressure
The advent of high-pressure pump tubing has expanded the range of applications for peristaltic pumps to unprecedented applications, including filtration.
The pressure source of a fluid delivery system can vary. Back pressure is created when pushing fluid through a filter, or pushing fluid through a flow meter or valve, or pumping fluid into a pressurized reaction vessel. Before selecting the pipe, the user should first make sure that all the pressure sources in the system have been clarified and the measured values ​​of the total system pressure have been obtained. When selecting a pump tube for a peristaltic pump, the user should ensure that the pressure in the system does not exceed the recommended working pressure of the pump tube. If the pressure is too high, the pump tubing will swell and will not work well with the pump head, resulting in excessive wear and failure. When the system pressure greatly exceeds the bearing capacity of the pump tube, the pump tube may even burst and spray fluid, which may endanger safety. Once a pipe has been selected, use it to ensure that the pressure is maintained within the pressure range recommended by the manufacturer. If the system exceeds *large working pressure, a simple pressure relief valve or pressure switch can be installed to prevent accumulation of excess pressure. The function of the pressure relief valve is to vent to the atmosphere when the system pressure exceeds the set value, so that the system pressure drops to a safe level. A more complicated pressure switch can also be used, which will turn off the device or sound the alarm through a relay when the pressure exceeds the set value. Both of the above methods are beneficial for safety when the system pressure exceeds the safety line.
Third, the temperature
The operating temperature range of the pump tubing is another important factor to consider. Some pipes, such as silicone rubber, have a wide temperature tolerance range and are suitable for high temperature and low temperature processes. Some pipes such as Tygon Ì„ and C-Flex Ì„ are only suitable for a small temperature range. * The end user should first understand the *high temperature and *low temperature in the system before selecting the pipe, and then ensure that the selected pump pipe works safely in this temperature range. In applications where temperature is to be gradually increased, the end user should consider the effect of temperature on the chemical resistance and pressure capacity of the pump tube. When the temperature is increased, the pressure capacity of the pump tube is reduced.
Fourth, the size
As each roller in the pump head presses through the pump tube, the peristaltic pump pumps a certain amount of fluid, so the size of the pump tube is directly related to the pumping flow, that is, the operation of the fluid delivery system is greatly affected. The pump tube is the key part to consider when designing the superior peristaltic pump. It is necessary to calculate the * good size or * good size range of the pump tube. The dimensions here mainly refer to the inner diameter and thickness of the pump tube. The inner diameter determines the amount of fluid pumped per revolution of the rotor, while the thickness determines the ability of the pump tube to return to its original shape after each rolling. This ability greatly affects the service life of the pump tube. The size of the pump tube is too small relative to the size of the pump head, the pump head can not hold the pump tube, the pump tube will be pulled out of the pump head; and the size of the pump tube is too small, the roller in the pump head can not hold the pump tube, This will result in insufficient pumping flow or complete failure. If the pump tube is too large, the excess tubing will wrinkle between the roller and the pump casing or between the roller and the bite bed, resulting in excessive wear and premature failure. * When selecting the pump tube size, the end user should follow the manufacturer's recommendations to ensure that the system functions well. In some applications where higher requirements are required (such as chemical dosing pumps), the size of the pump tube is even more pronounced. A slight deviation in size will cause the flow or dispensed deviation to be too large to qualify. Although some manufacturers offer pump tubing sizes that are “close†to the recommended sizes and “look the sameâ€, there are often gaps. Therefore, in order to achieve the best performance and working accuracy of the pump system, the user should use the size of the pump tube that is exactly the same size as the manufacturer recommends.
Ten factors affecting the performance of peristaltic pump tubing (1)
The pump tube is one of the important components of the peristaltic pump, and the end user often misplaces the tube, making it unsuitable for the desired application. Some users even use ordinary pipes instead of peristaltic pump tubes, causing disastrous consequences. With the increasing number of pump tubes on the market, it is also difficult to select pump tubes.