Diverter Damper

Blade/Flap Assembly
Standard Tee Diverter blades are engineered for high transient temperatures utilizing flat mill plate with or without stiffener. Stiffener designs reduce thermal gradients and thermal stresses.

Multi-Blade Diverter blades is a welded semi-monocoque structure designed to reduce thermal gradients and stresses.

Single Flap Diverter utilizes a hinged flap designed to isolate either diverter outlet. The flap is engineered with a rigid sub-structure and two insulated face panels. The sub-structure is exposed to gas reducing thermal gradients and stresses. Each face panel is allowed to expand and contract in response to transient temperatures eliminating thermal stress and distortion.

Shafts
Shafts are designed to transmit maximum torque and support all live and dead loads with appropriate safety factors per ASME. Thermal transients on startup require shafts and shaft connections be designed such that transient thermal stresses are reduced.

Connecting Links
Single Flap Diverters with link Drive require use of connecting links with custom spherical pivot bearings to allow for transient thermal growth of flap, links and shaft during startup. Bearings are metal alloy sleeve bearings with plugged graphite. Tee Diverter and Multi-Blade Diverter dampers use external connecting links between dampers with spherical rod ends at each end to allow for misalignments.

Seals
Standard Tee Diverter Seats – Bulb and metal seats are all designed for maximum longevity in gas turbine service. Seats are easily replaceable from the interior of the damper.

Flap Diverter Seals – Flap diverter seals are fabricated from nickel alloys known for high strength and fatigue resistance at elevated temperatures. Seals are engineered for thermal transients and long term exposure to turbulent high-temperature gas. present in harsh gas turbine exhaust environment.

Bearings
Self-lubricating sleeve bearings positioned at least 6” from frame exterior outboard of packing glands are standard on small diverter dampers. Medium to large diverter dampers will require metal alloy sleeve bearings with plugged graphite for all high temperature gas turbine applications.

Packing Gland
The standard packing gland for small diverters is a 2-bolt design having formed packing rings, the number of which depends on the maximum design pressure. Medium to large diverters require use of a larger gland design also packed with high-temperature graphite packing.

Internal Liner System
Internal lining system is composed of layers of 8 pound per cubic foot ceramic fiber insulation retained by 0.125” thick 409 stainless steel liner panels. Liner panels are held in place but allowed to freely expand and contract using ½” diameter threaded studs, hold down washers and seam channels. Panels are ‘ship-lapped’ in the direction of flow and seams are covered with seam channels to ensure a tight, vibration-free liner.