Ducting and expansion joints / flexible compensators for Freestanding SSM turbine steel stack designs .
Ducting and flexible compensators for Freestanding Steel stack concept
Turbines in operation creates vibration and thermal expansion - due to the high flue gas temperatures - in the ducting both between the exhaust flange at the boiler and though the inlet flange into the freestanding steel stack . To compensate, flexible compensators are needed - you can either use expansions joints of high temperature fabric or metal, depending of the temperature of the exhaust gas. Flexible compensators of fabric must be used for SSM turbine steel stacks with exhaust gas temperatures up to 600 degrees C with a max pressure of 0,5 bar.
When the temperature is higher than 600 degree C and the pressure is higher than 0,5 bar, we normally use expansion joints made of metal, which will compensate axial, lateral or angular vibrations.
If the flue gas has a high level of scoot carbon dust particles, we recommend to use PTFE expansion jointswith internal telescope devices. The expansion joints can be insulated and claddered according to the actual ducting set up and requirements from the plant design.
Free standing steel stacks always moves due to the actual weather conditions - we therefore recommend to place a flexible compensator, as close as possible to the inlet flange at the steel stack, in spite of the fact that it is low temperature exhaust gas .
The inlet into a steel stack turbine design, can either go though the structural steel of the stack or though the bottom of the stack, with a hanging inlet pipe.
The flexible compensators for SSM standard steel stack concept can contain welding ends, flanges or be customized.
SSM manufactures many types of ducting and all flexible compensators/ high temperature expansion joints