I have a 500 CST flexy tank oil that I have tried to pump to a near tank(2.5'' 9 m flexible pipe, 2.2 KW 1450 rpm 2'' 3 phaze gear pump). After 200 L the pump went off. It overheats and shuts down.
When it is warmer outside it performes well.
My problem is that when I calculate reynolds Number(which is low) and fricton losses everything works out well and the pump should work fine(energy consumption wize). There is barely even any head.
So how can I factor in this viscosity factor which is obviously more influental than now. It is clear that I am missing a formula.