Can metering pumps be used in parallel?
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This post was last edited by FLYTOINTER on 2010-7-11 at 23:04. Diaphragm-type dosing pumps are usually used in a one-in-use and one-backup configuration; they don’t seem to be designed for use with two units in parallel. I wonder if the two pumps interfere with each other when they are in operation? They can definitely be connected in parallel, with many pumps connected together; this is done either because the flow rate of a single pump is not sufficient or because multiple types of chemicals need to be added simultaneously. As for the issue of pulsation, multiple pumps connected in parallel can have their starting points shifted apart; the significant pulsation caused by a single pump can be eliminated by using multiple pumps in parallel. Engineers at Lewa once told me that by shifting the starting points of the pumps when they are used together, pulsation can be reduced by 90%. ——by flytointer
There should be an impact; diaphragm-type dosing pumps all discharge fluid intermittently
Parallel connection should work. But it’s not necessary. If the process requires a higher flow rate, the stroke can be adjusted. The principle of a diaphragm pump is the same as that of a syringe used for injections. The pressure is generally very high as well. The discharge occurs in pulses.
A metering pump is a high-precision delivery device that meets the requirements of various process flows; it can be adjusted to deliver various chemical liquids in precise quantities, with a metering accuracy of ±1%. It is suitable for transporting liquids with temperatures ranging from -30°C to 200°C, viscosities between 0.3 and 800 mm2/s, and no solid particles present. The flow rate can be adjusted within the range of 1.25 L to 8000 L, while the pressure ranges from 0.2 to 50 Mpa. There are over 150 different models available. Specialized pumps are designed for transporting suspension liquids that contain a small amount of solid particles with particle sizes below 0.01 mm. This series of products complies with the API675 standard. The repetition accuracy is 1% within a adjustment range of 10:1 ； The reproduction accuracy is 3% within a 10:1 adjustment range ； The linear accuracy is 3% within a 10:1 adjustment range. According to the user’s requirements, series combinations of pumps with the same or different housings can be used; multiple liquids can be pumped in different or identical proportions. The pump cylinders can be designed to withstand the corrosiveness of various liquids. Based on the structure of the hydraulic end, they can be divided into two main categories: piston type and diaphragm type. Based on the adjustment method, they can be divided into three categories: manual adjustment, electric adjustment, and pneumatic adjustment. The plunger-type hydraulic end is suitable for a wide range of high-pressure processing applications, and the liquids it transports are non-toxic, non-corrosive, and non-volatile. The diaphragm-type hydraulic end is suitable for slurries with strong adhesion, as well as flammable, explosive, volatile, highly toxic, and radioactive liquids, working fluids that deteriorate easily due to retention, and working fluids with high viscosity. It ensures leak-free operation of the pump. The hydraulic end of the insulated structure is suitable for high-melting-point liquids; the pump casing and stuffing box are insulated with jackets to prevent the liquid from freezing. The material used for the hydraulic end is usually 1Cr18Ni9Ti; depending on the medium being transported, other materials such as PTFE, PVC, and 1Cr18Ni12Mo2Ti can also be used. Metering pumps are classified into two basic types based on their pump head design: piston-type and diaphragm-type. Piston pumps feature a rational structure, simple operation, high measurement accuracy, easy maintenance, and low cost. Diaphragm pumps do not leak, offer high safety, and are suitable for transporting various flammable, explosive, highly toxic, highly corrosive, highly irritating, radioactive, and valuable special liquid media. The metering pump features intuitive and clear value adjustment, stable operation, low noise, and easy maintenance; it can also be used in parallel or in series.
In actual production, metering pumps can be used in parallel when the flow rate is insufficient. This situation is feasible! However, this approach is not recommended as it may cause pulsation in the pipeline. Parallel operation is a last-resort measure taken to meet production needs!
They can be used in parallel, as there are check valves at the inlet and outlet.
Sure, we are a company that manufactures metering pumps. We have previously made five-stage pumps and three-stage pumps. There are those used in chemical plants, and those used for experiments. Each traffic stream can be adjusted separately. The guy who went upstairs said, “There might be pulsation.” That’s true, but it’s a positive-displacement pump after all, and such pumps exhibit pulsation even when used alone; this isn’t a problem. Adding a damper usually solves the issue
Parallel use is possible. Metering pumps belong to the category of positive-displacement pumps, and their flow rate is pulsatory; therefore, it is important to pay attention to the displacement of these pumps during use, and to ensure that two pumps do not reach their maximum displacement at the same time, as this could result in an excessively high flow rate momentarily. To maintain a steady flow rate, metering pumps use multi-pump systems, which function in parallel; they contain crankshafts that keep the pistons of multiple pump heads in different positions
The common structural configuration is that for some models of pumps, several units are connected in parallel right from the factory
They can be connected in parallel; we’ve used them in our workshop!
The so-called “parallel connection” of pumps essentially involves installing two or more pumps between two containers, with two or more of them (including two) operating simultaneously. Installing multiple units when only one works means having an extra one ready to use ； Only when two or more pumps (including two) are operating simultaneously can the pump be considered to be in \"parallel\" operation” ； It can also be considered as devices that operate independently, with the specifications and models of each pump being either the same or different. Theoretically, there are no issues; it just depends on whether it is necessary and on the requirements of the manufacturing process.
There’s no problem; such issues are common. Some designs incorporate this approach: two pumps can be operated simultaneously during high flow rates, while only one pump is needed when the load is low, which provides flexibility. Alternatively, if the flow rate of the existing pump is insufficient, another pump can be added to increase the flow rate, as long as the outlet pressures specified on the pumps’ nameplates are similar, thereby avoiding interference between them.
The discussion was quite intense; it seems they can be connected in parallel :)