The positive differential expansion exceeding limit for intermediate pressure cylinder often occurred on two 300MW steam turbines in Huangpu Power Plant has been analysed

it is considered that the main causes are as follows:(1) the structure of intermediate pressure cylinder proper isn't perfect; (2) insufficient heating steam flow in the steam heating system; (3) the operation adjustment in every stage of starting up isn't reasonable. For these

measures of decreasing the said positive differential expansion have been taken

and having obvious effectiveness after implementation of abovementioned measures.