Power Generation... 

Eastman Chemical

Application

Valve control for a GE turbine, driving a 7.5 megawatt electric generator, operated on 1450 psig steam.

Customer

Eastman manufactures chemicals, fibres and plastics materials for use in a wide range of products.

The Challenge

The GE turbine, driving a 7.5 megawatt electric generator, operated on 1450 psig steam. The steam flow to the turbine was controlled by seven control valves mounted in the turbine’s steam chest and operated by individual cams mounted on a 2 inch diameter cam shaft. As the cam shaft rotated approximately 200º, the cams lift opened the 7 control valves in a sequence based on the position of each cam on the shaft.

The existing actuator on the turbine was a 10 inch diameter single acting, spring return hydraulic cylinder, operating off the 150 psig turbine lube oil system through a mechanical governor operated pilot valve.

Lacking the design data on the aging system, replacing or retrofitting the existing cylinder with similar technology would be expensive, if technically possible or feasible.

The Solution

Eastman chose a direct replacement of the existing hydraulic cylinder with a linear actuator. Eastman's engineers chose a GSX60 with a 10 inch stroke. 

High Strength

Long Life Expectancy

Reduced Total Ownership Costs

Reduced Maintenance

Results

The configuration required a handwheel for manual operation, with the clevis mount rotated 90º to allow unfettered access to the handwheel.

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