This duct balloon measured 25’4” wide x 12’0” high x 3’0” deep and is used during maintenance to the plants FGD system. The opening was designed to accommodate two standard pre hung door assembly's that measured about 6’8” high a 3’0” wide.
This special shape was also supplied with three 12” diameter access holes with covers that can be used for for running supply lines through the duct balloon while it’s fully inflated.
Another requirement was that this duct balloon be supplied with two 120V high pressure blowers to provide redundancy in the event of loss of power to one of the blowers.
Because of the natural draft in the duct work, a simple scaffold structure was assembled on both sides of the duct balloon in order to keep it in place prior to inflation
Once the scaffold was installed the duct balloon was fully inflated in less than 5 minutes
As you can see in this picture, the duct balloon sealed completely around the door opening.
Note: This project was profiled in the September 2008 Issue of Power Magazine. A web link to that article can be seen by clicking here
Copyright 2010 by G.R. Werth & Associates, Inc. - All rights reserved
Duct Balloon
Inflatable Isolation Barriers
