Selective Catalytic Reduction Systems are now a typical part of Coal Fired Plants and duct plugs can supplement and help seal these areas. The inclusion of this system has become an important part of Flue Gas Ducting.  Large dampers are installed on both sides of the unit to allow this portion of the process to be isolated for regular maintenance and inspections. 

Mechanical seals and systems break down and over time often become less effective. Shutting down these units for a full replacement is not always feasible and can incur very large costs. Our plugs offer an economical solution to dealing with leaking dampers and degraded seals without having to do major changes to hardware in the plant. Increased depth on our products offers more grabbing power when installing a Duct Plug on the low pressure side of the existing, degraded hardware. An inflatable provides a way to add additional sealing power in a very short amount of time. 

A Double Block and Bleed system should be used to relieve any back pressure that may occur between the existing, failing louvers and the duct plug. This is very similar to the thought process behind an isolation valve in hydraulic manifolds. Closing off two areas and allowing pressure that builds from small leaks an opportunity to escape.  

Any aftermarket modifications should be supervised and approved by the person in charge of regulating that all OSHA safety measures are followed at all times. These areas offer unseen dangers to the untrained eye.

Materials with a rating of 500°F (260ºC) still need to be offered insulation and protection. All sources of high heat need to be treated with caution when installing Duct Plugs.

FGD Outlet Duct Plug with Doorway and Pass Thru Tunnels.

There are occasions when a Flue Gas Ducting project requires the ability for people, hoses and other objects a way to pass through the blocked area. We have the capability to create entryways that allow a standard doorway to be installed using a wood or metal frame, fabric flaps and clamp bars for sealing around the door. This method also allows for smaller, pass through chambers to be installed that allow hoses and cords to pass thru and be sealed off using Velcro caps on the open ends. This application can be useful when isolationing or separating welding projects and volatile materials.  

A multiple inflation system is often called for when safety requirements hit a certain level. When that happens, more than one blower can be attached to a Y shaped inflation tube. Each blower has it's own set of louvers that prevent back flow. Multiple fans are designed to run on separate circuits. In the case of a power failure on one blower, the next blower in line allows the plug to stay inflated and in place.