Hot Boiler Water, Cold Makeup Water.

Stoker Coal Boilers automatically feed the coal and have controls and pumps just like any conventions boiler. They are intended to be used as a primary heat and often have domestic hot water coils as an added bonus. They can be set up independently or in dual sytem with your existing oil/gas boiler. They can accommodate both hot water base board or steam plumbing.
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Boots
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Joined: Thu. Nov. 10, 2011 4:38 pm
Stoker Coal Boiler: Keystoker KA-6
Hand Fed Coal Boiler: Burnham SFB 101 (sold)
Location: Central PA

Post Tue. Dec. 11, 2012 5:00 pm

Is it ok to purge air from my boilers while they are up to temp (180°-190°). The reason I ask is because of the cold makeup water being introduced as the pressure drops.

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LsFarm
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Stoker Coal Boiler: Axeman Anderson 260
Hand Fed Coal Boiler: Self-built 'Big Bertha' SS Boiler
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Location: Michigan

Post Tue. Dec. 11, 2012 8:58 pm

If the boiler vessel is cast iron, and you vent a large amount of air, then yes you could possibly thermal-shock the iron with the cool makup water.

It is very unlikely that you could heat stress a steel boiler vessel.

Does the makup water feed directly into the boiler vessel or into supply or return piping?

Greg L
Burning Pea/Buckwheat through an antique stoker [semi retired SSboiler],
Running an Axeman-Anderson 260M boiler burning Pea, About 150-250#per day
Farming, Fixing, Fabricating and Flying: 'spare time' what's that?

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Sting
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Other Heating: OBSO Lennox Pulse "Air Scorcher" burning NG
Location: Lower Fox Valley = Wisconsin

Post Tue. Dec. 11, 2012 10:54 pm

I might be more concerned about your safety ---- have you done this before?
Are you prepared for the venting of scalding liquid and the subsequent vapor cloud - the hot wet air in the boiler room or basement :sick:
When you turn your boiler on -Does it return the favor?
I have finally lost my mind. Don't bother to return it. It wasn't working properly anyway!

Visit Alternate Heating Sytems

Boots
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Posts: 196
Joined: Thu. Nov. 10, 2011 4:38 pm
Stoker Coal Boiler: Keystoker KA-6
Hand Fed Coal Boiler: Burnham SFB 101 (sold)
Location: Central PA

Post Wed. Dec. 12, 2012 4:07 pm

LS,

The make up water does feed directly into my cast iron oil fired boiler.

Sting,

short answer, Yes.

I have drained my boiler when hot before. And have done some purging. I have hose bib drain valves the I purge the air from, and I have a heavy duty hose with "water hose" ends that I place the discharge end of into a bucket. I have done this cold a few times, and purged a lot of air from the system. and I have done it hot only a hand full of times, but do not normally get enough air out that it needs to displace it with makeup water.

Last night I noticed that I could hear air bubbles as the main circulator ran. when the house was up to temp I decided to purge the air. I got enough air/water out that it dropped the pressure enough to allow makeup water to flow. I stopped purging the instant I heard it. I figured that it could cause an issue, but wanted to be sure.

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Sting
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Other Heating: OBSO Lennox Pulse "Air Scorcher" burning NG
Location: Lower Fox Valley = Wisconsin

Post Wed. Dec. 12, 2012 5:37 pm

good

now - when you introduce new water with this purging - you will/may also be stuffing in new air -- its in the new water :mad:

so a better plan may be to shut the system off on a calm day about noon - let the water sit and let the air get to the top of the system where the bleeders can let it out.

if you don't have bleeders - well then you still need to let the trapped air congregate by leaving the system off for a while -- then you can blow it out all at once

but -- It Depends

Kind Regards
Sting
When you turn your boiler on -Does it return the favor?
I have finally lost my mind. Don't bother to return it. It wasn't working properly anyway!

Boots
Member
Posts: 196
Joined: Thu. Nov. 10, 2011 4:38 pm
Stoker Coal Boiler: Keystoker KA-6
Hand Fed Coal Boiler: Burnham SFB 101 (sold)
Location: Central PA

Post Wed. Dec. 12, 2012 6:04 pm

thank you for the reply,advice, and tips. I need to plan a shut down to make a few other repairs as well. I guess I need to get on the ball.

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