Pressure seal valves in steam and boiler feedwater lines at a southeastern utility were leaking due, in part, to the thermal and pressure cycling which the valves were required to tolerate.

Operating temperature was 550°F at 1200° psig.

Hi-Pro Seal^® was hand brushed onto the seal rings of the leaking valves.

Utility maintenance personnel stated the valves coated with Hi-Pro Seal^® tolerated the pressure cycling and thermal cycling easily, and sealed the leaks.

The plant then expanded the use of Hi-Pro Seal^® to include use on valve seals in the 'donkey' boiler system; finding the product reduced time and maintenance expenditures required to repair valves or stop leaks.