The "drinking water" pump is actually a standard centrifugal pump. The difference with a standard pump is that the materials that come into contact with the medium have been chosen because they are suitable for drinking water. So they are generally what are called non-polluting materials. In general, it is still the simplest pump in terms of material choices, sealing and bearings. This is because drinking water has virtually no chemical effect. Wear is also present to a lesser extent, simply put because no wearing medium is pumped (drinking water is clean). This type of pump is also often used in other purely clean liquid applications, partly because its simple composition makes it a relatively cheap pump.
As with all pumps, the lifespan often depends on the use and sometimes abuse of a pump. The wear of the bearing or the failure of a shaft seal is often the reason why such a pump fails, in addition to, of course, a failure such as due to the aforementioned abuse or misuse in an installation. For example, no liquid supply, so-called dry running, which causes the shaft seal to burn, damage and ultimately fail.
Depending on the pressure/capacity, centrifugal pumps are all the same in terms of structure:
As standard, the impeller has a suction side in the center that, as suggested, sucks the liquid in through the suction connection in the housing. This is generated because the shape of the impeller blades pushes the liquid at the outlet (pressure side) out of the pump housing through a combination of speed and centrifugal force.
The pump can be divided into three parts; the bearing bracket, the fluid part and the shaft seal(s).
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