The temperature of sealing water has marked influence on the pumping speed of the pump. If the temperature is higher than 15°C, then the pumping speed of the pump is reduced, conversely this increases when the temperature is below 15°C. Therefore, it is standard practice for the capacity tables and curves to be based on water as the sealant at a temperature of 15°C at sea level. The following graph shows the percentage increase or decrease of the pumping speeds related to the water temperature.

It is recommended that the pump is not operated at temperatures and vacuum below the dotted line on the graph, otherwise cavitation can occur within the pump. This can cause a loud noise and badly damage the impeller.