EME Homer City Corrects Leakage Problems for Two 600-MW Units

Units 1 and 2 of EME Homer City ’s two 600-MW supercritical units were installed in the late 1960s and incorporated Foster Wheeler steam generators. They are equipped for cycling operation.

For some time, the reheat spray valves had been leaking, and it had become evident that the deaerator level-control valves were under capacity. Based on the excellent experience EME Homer City has experienced with some 18 other CCI DRAG® severe-service control valves elsewhere in their operations, they decided to correct these leakage and under-capacity problems with replacement CCI valves. Existing valves on reheat spray service were replaced with four, 2-inch(50-millimeter), 900-pound (410-kilogram) valves rated at 55,000 pounds/hour (415 kilograms/minute) with inlet pressures as high as 1600 psig (110 BARG) and differential pressures up to 900 psi (62 BAR). Operating temperature is 900 F (480 C).

The two new deaerator level control valves are 18-inch (460-millimeter), 300-pound valves and are rated at 3,900,000pounds/hour (30,000 kilogram/minutes), 350 psig (24 BAR) with differential pressures as high as 300 psi (21 BAR). Operating temperature is 140 F (50 C).

Published in SOLUTIONS Fall 2000