Often, people would like to circulate fluids with a high temperature using a centrifugal pump in industrial applications.
This should not be a problem, if the temperature does not get too high.
Typically, the maximum temperature that a centrifugal can handle is around 120 degrees Celsius. Of course, this differs per manufacturer and pump type.
Temperatures exceeding 120 degrees, as well as the pressure that comes with these temperatures, will cause issues with the mechanical seals and the cooling of the electric motor.
Currently, there are many solutions available to cool the mechanical seals externally, like external seal plans.
The downside to using these is that these pumps have a poor output (they devour energy!).
In addition, they also assembled horizontally and this takes up quite some space.
There are also some standard solutions available to accommodate for these high temperatures.
Like a vertical multistage pump as shown below. Multistage pumps are available in different types and make it possible to reach a temperature of up to 180 °C.
< 150 °C type
This application concerns a special design of the seal chamber.
The seal chamber has been designed in such a way as to assure adequate flow of the pumped fluid as described in position 1 in the image below.
In addition the application possesses a balanced mechanical seal in order to withstand high pressures and temperatures. In the picture down below, this is an Eagel Burgman seal.
< 180 °C type
Temperature can rise sharply in applications like a boiler feed. We deal with high temperatures and pressure when temperatures rise above 150 °C.
Below you will find an image of a relatively standard solution with a strange outlet valve. You will find a description of different adaptions to make your
pump suitable for temperature up until 180 °C.
1: Balanced mechanical seal due to high temperatures and pressure
2: Special chamber which ensures air recirculation which lowers the temperature of the mechanical seal
3: Vapour relief valve which eliminates air in the mechanical seal area
4: Double partition, custom made for high pressure
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