chimney liner and insulation - oil boiler

Robert O'Brien

it's a single pass Peerless unless it's underfired it won't condense in the average UNLINED chimney.Plenty of stack temp!

john_230

chimney liner and insulation

I need to install a chiney liner. boiler is a 3 section CI Peerless. oil fuel.

At what btu level is liner insulation (pourable chimex or thermex) required to prevent condensation, and the surfuric acid it generates - whcih is corrosive to the liner.

I am installing a 316 T stainless steel, 6 inch line - and tryin gto decide if need to spend the dollars for insulation.

Best,
John

Ken Field

Air is an insulator

If you make sure the top and bottom of the chimney is stuffed with fiberglass and air tight, the air trapped inside also acts as an insulator. All you have to heat up is the stainless. I think that will work as long as you have 350+ entering and size it appropriately. If you use a small enough liner, you might not need a draft regulator either. That will help matters too.

Ken

Mark Custis

Thanks Ken

I knew that, but forgot that I knew that.

john_230

to obrian...

Thanks

It is a single pass Peerless, bu the chimney needs a liner because the terracotta tile is eroded and broken away.

So liner will be stainless steel - but question is do I need to use insulation around the stainless steel - or can I do just the stainless liner, and no insulation?

the disadvantages I see to using insulation around the liner is 1) cost and 2) makes it difficult to repair / replace liner again in the future, or resize it, etc..should that ever be needed.

Would prefer to do the job with steel liner only and no insulation, but one vendor said steel is prone to condensation, and corrosion if not insulated.

View?

Best Regards,

Edward A. (Ed) Carey_3

How large is the chimney

John,

How large is the ID of the chimney that you are installing the 6"liner?

How (tall) high is the chimney from the thimble to the top?

Is it straight from top to bottom, or is it offset?

Ed Carey

Jack

Check Appendix E in 31

for some sizing guidelines. Sweeps with whom I've spoken find the sizings to be spot on. Is this an interior or exterior chimney. It makes a significant difference in performance. Answer those questions all ready asked and consider an insulated vent coneector. I've posted this before, but when John Strasser and Rich Krajewski did their vent modeling they said the thing that had the greatest impact on performance was an insulated chimney liner. Depending upon the size, you can get DS from Selkirk or DVL from Duravent.