Dampers

Aras Power Systems designs and supplies flue-gas dampers — butterfly, louver, diverter, guillotine, shut-off and poppet types — for flow control and isolation in power-plant and industrial exhaust systems. Dampers are engineered for duct sizes from 0.3 m to 10 m and gas temperatures up to 650 °C, with seal-air guillotine and double-blade designs reaching up to 100% sealing efficiency for man-safe isolation.

Codes & standards

Aras Power Systems designs flue-gas dampers to the client-nominated code basis, combining international standards with project-specific operating, safety and documentation requirements.

• ASME
• EN 1090 / EN 1993
• AMCA leakage class
• ASME IX
• ISO 12944

Our Services

Our engineering and supply scope is structured to deliver safe, efficient and project-specific equipment from concept design through fabrication, site support and documentation.

Design compliance

• ASME and EN standards: ensuring that damper designs meet the project’s mechanical, structural and fabrication requirements.
• Diverse damper types: engineering butterfly, louver, shut-off, diverter, guillotine and poppet dampers for specific flow-control and isolation duties.

Computational Fluid Dynamics (CFD)

• Flow analysis: reviewing gas-flow distribution and pressure drop across damper blades and frames.
• Operational efficiency: optimising on/off and modulating operation to maintain controlled flow with minimum energy loss.

Finite Element Analysis (FEA)

• Structural integrity: verifying frames, shafts, blades and supports under temperature, pressure and actuation loads.
• Temperature considerations: checking deformation risks and thermal expansion in hot-gas service.

High-temperature design

• Material and coating selection: selecting carbon steel, stainless steel and coating systems for the process environment.
• Thermal expansion: designing clearances and seals to prevent warping, sticking and leakage.

Actuation systems

• Actuation mechanisms: integrating electric, pneumatic, hydraulic or manual drives.
• Control integration: providing fail-open/fail-close logic, position feedback and plant DCS interface where required.

Documentation and quality assurance

• Technical documentation: providing CAD drawings, specifications, actuator data and installation guidelines.
• Testing and inspection: defining leakage, functional, dimensional, welding and coating controls.

Technical specification

All ranges are a configurable engineering design envelope, finalised against project-specific data and applicable codes.

Applications

• GT combined-cycle bypass and diverter systems
• HRSG inlet/outlet isolation
• Flue-gas desulphurisation ducting
• Industrial exhaust and process-gas systems

Frequently asked questions

What sealing efficiency can your dampers achieve?

Seal-air guillotine and double-blade dampers can reach up to 100% sealing efficiency for man-safe positive isolation. Final sealing class is defined and verified according to project requirements.

What is the difference between a diverter and a guillotine damper?

A diverter damper routes gas between paths such as HRSG and bypass stack, while a guillotine damper provides positive isolation for safe downstream maintenance.

Which actuation options do you offer?

Electric, pneumatic, hydraulic and manual actuation can be supplied, including fail-open or fail-close configurations and DCS feedback signals.

What temperatures can the dampers handle?

Standard designs cover hot-gas service up to 650 °C, with higher temperatures handled through refractory lining, cooling arrangements or material upgrades.