Comparison of the advantages of peristaltic pumps and other chemical pumps

It is understood that peristaltic pumps are the fastest growing technology in the world. Usually, chemical corrosion products corrode the valves, seals, rotors, and moving parts of diaphragm pumps and single-screw pumps, resulting in pump damage and production interruptions. Whereas peristaltic pumps have no valves, no leaks, and no mechanical parts in the product line. The fluid is only in contact with the inner wall of the hose or the pipe, and the cost of the pipe is very low, it is low maintenance, and it is very durable.

The principle of operation of a Peristaltic Pump is very simple. A length of hose or tube is placed along with a fixed pump casing and compressed from the outside by rollers or lugs (hose pumps). As the rollers or nubs move along the outside of the tube, fluid is pushed towards the outlet; as the hose or tube behind the nubs returns to its original shape, more fluid is drawn into the pump. The heart of the pump is the hose or tube. It has a long service life and is resistant to corrosion by concentrated acids, alkalis, and solvents. The flow rate of the peristaltic pump is proportional to the rotational speed. The peristaltic pump has no check valve, which eliminates the source of inaccurate metering, so the phenomenon of steam lock will not occur. With valves in diaphragm pumps, there is a risk of jamming, and clogging (due to corrosion of the valve ball or seat), resulting in inflow changes that disrupt the consistency of the final product or result in differences in product quality. The turndown ratio (maximum flow/minimum flow) or flow range of peristaltic pumps is unmatched by other pumps. By simply controlling the rotor speed, the turndown ratio can be scaled up to 1 million by equipping with tubes of different sizes. Diaphragm pumps can usually only achieve a speed ratio of 20:1 under the control of conventional controllers. Although the stroke length of the diaphragm can be adjusted to increase the turndown ratio, the metering accuracy will be greatly reduced in the case of short strokes. When a large flow range is required, two or more diaphragm pumps are usually used to control the flow, which can be solved by a peristaltic pump.

The initial investment cost of a peristaltic pump may be slightly higher than other pumps, but the installation, maintenance, spare parts, and related auxiliary equipment of other pumps can be very expensive, and in terms of life cycle costs, peristaltic pumps are superior. In a peristaltic pump, the tube or hose is the only wetted part, requiring little maintenance, no expensive seals to replace, no valves, and no rotors or stators to wear out. It's just the hose or tube that needs to be replaced regularly. Industrial-grade peristaltic pumps deliver thousands of hours of reliable operation. The process of replacing a hose is usually less than an hour, and in some cases, only a few minutes, before the hose fails due to fatigue. Moreover, the hose can be changed quickly and safely without any special tools. This is significantly less than the 4-6 hour repair time required for a diaphragm or single screw pumps, not counting the extra time they take to move, transfer and reinstall. The cost of the hose is very low compared to the repair of a diaphragm pump or a single screw pump, where replacement wet-end parts such as ball valves, rotors, and stators can account for up to 75% of the initial pump purchase cost.

Peristaltic pumps do not require the installation of auxiliary equipment. Diaphragm pumps require a back pressure valve and a vent valve to ensure proper operation of the internal check valve. Single screw pumps typically require dual mechanical seals, flushing systems, dry running protection, and built-in check valves. With peristaltic pumps, the cost of these auxiliary components can be eliminated. Many positive displacement pumps require the additional purchase of a separate control board or frequency converter for variable flow metering. If the flow range needs to be increased, the cost and complexity will also increase. The peristaltic pump is self-priming (up to approx. 10 meters), which increases operator safety as the handling of hazardous chemicals is reduced. This kind of pump also has a certain dry running function, which is very suitable for the emptying of storage tanks or other unmanned operation occasions. Peristaltic pumps can also run in reverse and can be used to drain pipes or remove blockages by simply changing the direction of rotation. As a result, the functions and advantages of peristaltic hose pumps will gradually become known. New peristaltic pumps are fast becoming the primary choice for aggressive chemicals.

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