Peristaltic pump purchase knowledge (2)

Peristaltic pump purchase knowledge (2)

The significant advantage of the peristaltic pump* is that the pump tubing is used as a pumping chamber. The fluid only flows through the pump tube without contaminating the pump body, and the pump tube does not contaminate the fluid. Simply replace the pump tubing when cleaning. This eliminates costly disassembly and maintenance time.

The key to using a peristaltic pump is to select the pump head, pump tubing and drive. Specific application requirements determine the features to consider when purchasing a pump product. For specific needs, we offer pump heads, pump tubing materials and pump tubing sizes in different types and shapes. Different combinations can handle different fluid delivery requirements.

Pump tube selection:

Choosing the right pump tube is just as important as choosing a good pump head. Conventional pump heads are available in a variety of pump tube sizes. Special pumps usually require a special-shaped pump tube, a hose pump assembly or a special joint.
The types of hose materials found in the market are extremely rich and the price changes are extremely large (see Figure 3). However, only a few can be used as pump tubing materials. Some materials look similar, but pumping performance is quite different. A good pump tube should have excellent tensile and anti-extrusion properties. Most pump manufacturers offer a variety of test-proven pump tubing. These pump tubing materials have a stable flexural yield limit that ensures flow stability.
Pump tubing materials should be selected based on application needs and operator preferences. However, special attention should be paid to the satisfaction of the following indicators:
• Chemical compatibility
When selecting a peristaltic pump for pumping corrosive fluids, the key is to choose the right pump tubing material. Choosing the wrong pump tube can lead to danger and may damage the equipment and endanger personal safety. Please consult the pump and pump tube manufacturer for a list of chemical compatibility for each use. The pump must be tested before using new or unspecified grades of chemicals. Dip a small length of pump tubing into the fluid. Check the change in size, color, weight and strength of the pump tubing. If possible, test the pump tubing in the pump before using the pump tubing. When the pump tube is deflected during extrusion, chemicals are thrown into the tube wall to accelerate the aging of the tube.
• Non-polluting
• Separation of fluids is critical in many applications such as laboratory research, pharmaceuticals, and biotech production. A large number of studies have demonstrated that silicone tubes and silicon-based materials do not chemically react with various biological materials. There are other types of materials that have this property and can meet USP Class VI requirements. Some pumps use a pump tubing assembly made of inert PTFE tubing.
• Note: After prolonged operation, some of the particles in the tubing will separate and fall into the fluid. Experts call this the "peeling phenomenon." In some applications, such particles can be observed with the naked eye. In order to minimize the peeling phenomenon, the frequency of pipe replacement should be increased.
• Flexibility
The ability of different tubes to withstand repeated roller crushing varies. In general, the combination of specific pump tube sizes, pump tubing materials, pump head types, and operating speeds determines the service life of the pump tubing. The service life of the pump tubing, or the flexural yield limit in the pump, is a primary consideration before putting into new applications. Nowadays, it is quite common to use thermoplastic elastomer (TPE) in the system and the pump tube has a service life of more than 500 hours.
The performance of the pump is very stable in a particular application. Selecting a pipe with a high resistance to flexing, using a thicker pipe wall, and/or selecting a larger pump and using a lower operating speed can greatly extend the mission of the pump tube.
• clarity
For some applications, it is very valuable to observe the movement of the fluid through the pipeline in order to clearly understand the working process such as pumping or dry running. But on the other hand, opaque tubing is good for some photosensitive fluids.
•Hardness Tester
Wall hardness is critical to determining the pumping capacity of a particular pipe. If the pump tube is too soft, it is easy to break; if the pump tube is too hard, the pump will not work. A hardness tester (such as Shore A, etc.) can be used to determine the physical properties of a particular pipe. .
• Fluid pressure
Fluid pressure typically limits the ability of the pump tubing to deliver pressurized fluid. Most peristaltic pumps use unsupported tubing. This type of pump tube has a pressure limit of 2 to 3 bar (30 to 45 pounds per square inch). Some of the larger pumps on the market use supported pipes (with braid reinforcement). The pump tube soaked in the lubricating fluid can withstand pressures of up to 15 to 20 bar (300 psi).

Drive selection:
Select the drive motor according to the type of control required. Most pump manufacturers consider the interchangeability between the pump head and the drive to some extent. This is especially important in the early stages of pump testing and various types of research.
• Fixed speed drive
It represents a simple fluid delivery method. The pump system maintains a constant operating speed throughout the entire run. Sometimes the flow can be changed by changing the size of the pump tubing.
• Variable speed drive
Variable speed drives are considered for applications where a large flow adjustment range is required. Pumping the right flow at the right time requires some skill. Variable speed drives are typically continuously variable between *low and *high speeds. Motor speed, reduction ratio, and percentage speed adjustment are three key factors to consider when selecting a drive. The reverse characteristics of the drive help to clean the suction line before replacing the pump tubing.
• Digital display
• A controller with a microprocessor increases the pump's operating level. Strict piping control and load regulation ensure smooth fluid delivery. Simply adjust your pump system to display flow and other important setup guides on the digital display.
•remote control
Integrating pumps into automated systems for laboratory or industrial control has become increasingly important. Controllable functions include: start or stop, reverse, pump, dispense or copy, speed, etc. Optional analog control interfaces (such as DC voltage, current, or contact closure) or digital control interfaces (such as RS-232).

to sum up:
Peristaltic pumps are highly adaptable for specific application needs. New developments are expanding their range of applications and capabilities.

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