Hey; 

What i know is that pressure drop in the preheater should not be more than 40 mbar (from top to down) and the pressure drop between each two cyclone is 7-10 mbar, am i right? If i am what will happen if for example the pressure drop between 2 cyclone (2 &3) is 8 mbar while the pressure drop between cyclone (3&4) is 18 mbar? 

Our 5 stages preheater (offline calciner type) pressure drops are:

Cyc-1: -77 mbar

Cyc-2: -55 mbar ( press. drop= 22 mbar)

Cyc-3: -45 mbar ( press.drop= 10 mbar)

Cyc-4: -34 mbar (press.drop= 11 mbar)

Cyc-5: -20 mbar ( press. drop= 14 mbar)

are these drops are satisfactory??