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Posted by Dusty Shaw on January 23, 2002 at 15:41:48:
In Reply to: STACK LOSSES posted by Rick Gozdek on October 08, 2001 at 09:56:47:
: I'm looking to buy for my clients a flue modification technology for stack-vented fossil-fuel heating & process equipment such as in industrial power & atmospheric boilers systems.
: A product in short that allows the boilers to operate at all times at its optimum manufacture- designed efficiency, with the least amount of "stack-loss" practically achievable.
: Does anyyou have any devices that can fit in the stack to minimize stack lossess?Like a draft regulator?
: I heard it is good to have a positive pressure(inches of water column)instead of negative pressure created by the stack for most boilers.
: If this is true how much positive pressure can I have in the breach(inches of water column)
: 1" 2" 3" 4' 5" ?
An atmospheric unit must have a negative draft. Control of this draft can be achieved simply by installing a barametric damper. Proper installation and wieghting is a must.
Draft also depends on boiler type and size, most firetube boiler (forced draft units) can run at + or - .5" w.c. Watertube boilers have many different variables to consider when determining proper draft. Its a must see situation. There are many different draft controls available on the market today. Depending on your locating, your local boiler company should be able to help you. Mind you, I did say "BOILER" CO. "NOT" Mr.We Do It All.