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Posted by tm on June 22, 2005 at 08:57:10:
In Reply to: Re: Caps inslalled on boiler stacks. posted by Boiler Bob on June 20, 2005 at 19:32:02:
Bob,
This may not be the precise answer you are looking for, but I would suggest you consult a licensed PE in your area. If you have stacks 30 to 50 feet high then your boiler capacity is such that you need to find out required flue gas velocity and also how high above the rooftop does the stack extend. The PE should be able to help also with pinning down the regs on this. Tom
: These are firetube boilers, three, each with their own stacks. Rear of boilers are located pretty much under the stacks, not much of a breaching. The caps in question would be raised above the opening of the stacks to ward off rain but never to close off the opening of stacks. The stack are approximately 30...maybe 50 feet in height. Anyone having additional opinions about this or more factual rules/regulations please respond as I would like to hear what you all think.
: : Hi Boiler Bob,
: : I visit the forum now and then seems like not as many posting as I used to see. Yours seemed a bit interesting. Is the boiler in question built with the rear of the boiler directly under the stack uptake, no breeching? If this boiler is using a stack in common with other boiler(s) it should have an outlet damper. I don't think stacks should be capped unles the boiler is decommissioned, never minding that some of them are quite high.
: : : Are there any rules, especially in the New England states (Maine, New Hampshire, Massachusetts, etc.) that that explain whether or not caps can be added over boiler stacks for the purpose of keeping rain from going down the stack and causing build-up at the ends of firetubes at the back of boiler? Are these allowed? If not, why? Thanks.