Over the years, Pric Fluid has been based on market needs to help solve the challenges faced by customers in industries and fields such as biopharmaceuticals, food processing, packaging and printing, environmental engineering, chemical synthesis, and optoelectronics. However, every day, what kind of peristaltic pump hose are customers struggling to use to build and transfer a variety of different fluids? What material, diameter and wall thickness of hose should be used for transmission? What's the difference between them? How to choose the speed range and flow range...
So, today we first analyze what factors should be considered when choosing a hose.
First, hose characteristics
1. The pump tube has a certain elasticity, that is, the hose can quickly recover its shape after radial compression (Shore hardness :40~80).
2. It has certain wear resistance
3. Ability to work under pressure
4. Low absorption (good air tightness)
5. Good temperature resistance, not easy to age
6. Anti-corrosion and non-swelling
7. Low precipitates
Second, chemical compatibility
When the hose transmits different fluids, it should show certain excellent chemical properties, which is called chemical compatibility. Such as: low adsorption, good temperature resistance, not easy to age, no expansion, corrosion resistance, low sediment. Ordinary pipes have only general contact with chemical substances, and peristaltic pump pipes are in contact with chemical fluids under working conditions, so the chemical compatibility level of ordinary pipes cannot be equal to the chemical compatibility level of peristaltic pump pipes. For various transmission solutions, the peristaltic pump has a corresponding hose to meet the demand. The user should check each chemical in the solution to ensure that it is compatible with the selected pump tube.
Chemical compatibility test: Take a section of sample tube, record its weight, diameter, length and other parameters, soak for at least 48 hours, take out the sample tube, in medium, soak for at least 48 hours, take out the sample tube, clean and dry with water, re-measure its weight, diameter and length, and observe the changes; Also check whether the hose is soft or brittle. If there is a change, it means that the hose is affected by liquid chemistry, that is, the hose is incompatible with the liquid. Each candidate pump tube sample should be put into the actual factory environment for trial operation, and closely observe the test results. If the pump tube does not fade, swell, crack, loss of fluidity, or other signs of deterioration after a test run, it is proven to be fluid compatible.
Three, pressure
Back pressure is created when a pump pushes fluid through a filter, or pushes fluid through a flowmeter or valve, or pumps fluid into a pressure reaction vessel. The application of peristaltic pump is limited by the pressure performance of the hose. If the system pressure exceeds the hose pressure, the hose will expand, resulting in excessive hose wear or hose rupture. The factors that affect the pressure of the hose are: material, diameter and wall thickness ratio.
Four, temperature
The adaptability of the hose to the operating temperature range is a factor that the user should consider. Different materials have different temperature properties. Some pipes, such as silicone rubber, have a wide temperature bearing range, suitable for high and low temperature processes; Some pipes are only suitable for small temperature ranges. Therefore, before selecting the pipe, the user should first find out the highest and lowest temperature in the system, and then ensure that the selected pump pipe works safely within this temperature range.
Five, size
The size of the hose directly affects the flow rate, the inner diameter of the hose determines the flow rate, and the inner diameter is proportional to the flow rate. The wall thickness affects the compression and rebound ability of the hose, and also has a great impact on the service life of the hose.
6. Transparency
Whether to use a transparent pipe depends on whether the operator needs to observe the fluid in the pipe at all times and whether the fluid is sensitive to light. If the operator needs to observe fluids, bubbles, particles, contamination, etc. in the pipe at any time, Tygon transparent pipes such as polyethylene or silicone rubber should be selected if the solution should not be exposed, opaque pipes should be selected.
Seven, breathability
For some gas-sensitive fluids, such as easily oxidized fluids or anaerobic cell culture fluids, the user should consider the permeability of the pipe. Generally speaking, the gas permeability of silicone tubes is high. Therefore, for fluids that are not suitable for contact with gas, pipelines with low permeability should be selected
Eight, certification
The hose can pass the relevant certification when used for the relevant purpose. For example, United States Pharmacopeia standards USP, European Pharmacopeia standards EP, United States Food and Drug Administration standards FDA, United States Department of Agriculture standards USDA National Health Foundation standards NSF.
Nine, hose service life
Different hoses are resistant to repeated roller extrusion and have different friction capabilities. Different pipe types, pipes, pump heads, and operating speeds have different life spans. Choose long-life, thick-walled tubes and high-flow pumps that operate at lower speeds for longer hose life.
Ten, peristaltic pump hose flow range
Each peristaltic pump hose corresponds to a fixed speed range, and we choose the appropriate hose according to the flow range required by the customer.