fire side boiler condensation

Wild Bill

Hello Wallies,
I looked at a job today with a significant amount of 37 inch tall "wide body" radiators. The existing steam rads (nipples up and down in the rads) and steam piping will be retained, but they are being converted to hot water. A large Mills boiler is to be removed, and someone suggested a small Smith 8 Series as a replacement. I am of course going to do a heat loss calculation, but my real concern is fire side condensation of the boiler, especially during the beginning and end of the heating season. The water content of the new boiler is so low, an aquastat on the supply pipe does not seem practical, especially given the huge volume of H2O in the connected load. Any thoughts?????
As usual, thank you in advance.
Wild Bill

doug piaza

boiler condensation

Taco has a new variable speed "00" circulator that has a built in pump controler and boiler sensor. I have not seen these in use yet, but my custormers are very interested in them. Also burnham boliers offer the"RTC" return temerature control., wwich uses a 3 way valve to prevent bolier shock and flue gas condensation, these are used on the series V9
series boilers and several of my customers have installed the and they work well.
hope this helps you
Doug Piazza
Consolidated Plumbing Supply
Mt Vernon NY

Firedragon_4

If you read the 8 Series literature

they will tell you how to pipe it using several diferent piping schemes and by-pass venues. Go for it! BTW, the lit is on-line at http://www.smithboiler.com/html/8-iom-8.pdf

Burham in their Heating Helper also has quite a bit on by-pass piping.

Nron_4

buffer tank

try adding a buffer tank to the system to prevent the problem

hr

The very best

way is to have a valve or pump, or control that actually watches the return temperature at the return connection of the boiler.

Futhermore this valve, pump, or control needs to be able to respond to the cold temperature to protect the boiler from extended cold return temperatures.

The bypass piping and pumping alone will, or may not, protect your investment.

Burnham and Weil, among others have addressed this with models like the GV Gold and Revolution series that have built in return protection.

Any other method is just a guess, in my opinion. As boiler replacement warranties continue to rise due to cold shocking the boiler manufactures will, or should offer methods and drawings to provide adequate return protection.

This link below suggest a few methods also, from Burnham.

http://www.pmengineer.com/CDA/ArticleInformation/features/BNP__Features__Item/0,2732,90176,00.html

hot rod

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