The outlet-water temperature from heaters is an important supervisory parameter for judging the operation situation of heaters.Taking the low-pressure heater no.2 of steam turbine unit no.11 in Ma'anshan Power Plant as an example

the causes leading to abnormal outlet-water temperature have been analysed

it is believed that the large amount of leakage from copper tubes in heat exchanger of the low-pressure heater no.4 pushes aside the extraction steam of low-pressure heater no.3

and then pushes aside the extraction steam in sixth section of the low-pressure heater no.2

thereby the outlet-water temperature from the low-pressure heater being decreased.The adopted measures to eliminate the fault and the obtained results have been presented.