DEKOMTE has many designs for hot casing exhaust systems of gas turbine systems. In order to establish a suitable design of casing, support, stiffeners and expansion joint, the stress calculations and fatigue of materials must be considered. Most significant in the calculation process is the cycling and types of starts that a plant will run.
The temperature gradient of the casing to the fabric clamping area will create high stresses, increasing fatigue and reducing life. Square ducts can have more serious problems with the corner regions due to high stresses.
In many plants the failure and replacement of fabric expansion joints is considered a normal and routine maintenance. With weld repairs to steel parts, adjacent stiffeners and duct cracks and regular outage activity.
DEKOMTE has more than two decades of experience in designing two shift, high cycling expansion joint systems. The goal is a complete solution which encompasses the whole scope of duct, frame, adjacent insulation and expansion joint to give a lifetime maintenance free solution.
DEKOMTE Belt expansion joint 10W as base load solution suitable for small GT applications; max. 320 cycles.
DEKOMTE Membrane expansion joint ME suitable for large axial movements; max. 10,500 cycles.
DEKOMTE 3WA Hightech expansion joint as cycling solution with ultra-long durability suitable for large axial and lateral movements.
|Dimension inside||7000 x 8000 mm|
|Temperature||max. 670 °C|
|Movement||axial: -200 mm
lateral: 100 mm
|Thermal transient||cyclic operation|
|Maximum stress||400 N/mm²|
|Load cycles||250 000|
Example of operating parameters for the hot casing design of a fabric expansion joint