about 30 tests have been done on a hydraulic unit for a walking beam furnace.
TAN increase:from 1 to 6
viscosity increase:from 46 to 55(oil grade is 46)
Fe and Cr increase
the oil has been changed when reaching these critical values and again it seems the problem is going to repeat as I see new oil trend.this problem has been observed in some other units.
is there a common problem.