Temperature Rise Across The Heater (TR) – The difference between the temperature of the feedwater leaving the heater and the feedwater entering heater.

Calculations

TERMINAL TEMPERATURE (TTD)

TTD = t sat – t fw out

Where:

t sat = saturation temperature taken at the heater shell pressure, o C. t = temperature of feedwater leaving the heater, o C.

DRAIN COOLER APPORACH TEMPERATURE (DCA)

DCA = t drains - t fw in

Where:

t drains = temperature of the drains leaving the heater, oC t fw in = temperature of feedwater entering the heater, o C

TEMPERATURE RISE (TR)

TR = t fw out – t fw in

Annexure -V

FAULT TREE

LOW FEED WATER TEMPERATURE

EXCESSIVE MAKEUP

POOR FEEDWATER HEATER PERFORMANCE

HIGH TERMINAL TEMPERATURE DIFFERENCE (TTD)

EXCESSIVE VENTING