Coal Boiler Pressure Question

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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lsayre
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Posts: 12189
Joined: Wed. Nov. 23, 2005 9:17 pm
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Blaschak Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW)
Location: N/E Ohio, between Medina and Wadsworth

Post Sat. Sep. 14, 2013 10:16 am

I bumped up my pressure recently, and today I'm seeing 16 lbs. at 205 degrees. Is that OK, or should I drop it down a bit?

Edited to correct my poor spelling.
Last edited by lsayre on Sat. Sep. 14, 2013 10:29 am, edited 1 time in total.
-Larry

Democracy rests upon the principle that collective wisdom arises from a pool of individual ignorance. A Republic rests squarely upon objective law, and fundamentally upon those laws which restrict the scope and actions of government.

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blrman07
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Posts: 2379
Joined: Mon. Sep. 27, 2010 3:39 pm
Hand Fed Coal Boiler: Bucket a Day
Hand Fed Coal Stove: Vigilant Casting 2310
Coal Size/Type: Pea/Nut/Wood in the VC and anything that will fit in the Bucket a Day. It's not fussy.
Location: Girardville Pa.

Post Sat. Sep. 14, 2013 10:23 am

It's supposed to be at or around 12 but your OK. If it was me, I would drop it to 12-13 but that's just me.

Rev. Larry
Rev. Larry
Ashland Pa.

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lsayre
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Posts: 12189
Joined: Wed. Nov. 23, 2005 9:17 pm
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Blaschak Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW)
Location: N/E Ohio, between Medina and Wadsworth

Post Sat. Sep. 14, 2013 10:30 am

To drop it, will I need to bleed it a bit?
-Larry

Democracy rests upon the principle that collective wisdom arises from a pool of individual ignorance. A Republic rests squarely upon objective law, and fundamentally upon those laws which restrict the scope and actions of government.

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Rob R.
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Posts: 11343
Joined: Fri. Dec. 28, 2007 4:26 pm
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy
Location: Chazy, NY

Post Sat. Sep. 14, 2013 10:47 am

15-16 psi is fine, so is 20...but your expansion tank should match the cold-fill pressure.

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lsayre
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Posts: 12189
Joined: Wed. Nov. 23, 2005 9:17 pm
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Blaschak Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW)
Location: N/E Ohio, between Medina and Wadsworth

Post Sat. Sep. 14, 2013 12:29 pm

Rob R. wrote:15-16 psi is fine, so is 20...but your expansion tank should match the cold-fill pressure.
No way at this juncture (that I know of) to tell what the cold fill pressure is. Will be shutting down and cleaning out sometime in early October, so I can check it then.
-Larry

Democracy rests upon the principle that collective wisdom arises from a pool of individual ignorance. A Republic rests squarely upon objective law, and fundamentally upon those laws which restrict the scope and actions of government.

franco b
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Posts: 8426
Joined: Wed. Nov. 05, 2008 5:11 pm
Hand Fed Coal Stove: V ermont Castings 2310, Franco Belge 262
Baseburners & Antiques: Glenwood Modern Oak 114
Coal Size/Type: nut and pea
Location: Kent CT

Post Sat. Sep. 14, 2013 2:11 pm

Pressure as I understand it is only to raise the water to the highest radiator or heat exchanger. Three story house needs more than two story house.

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Freddy
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Posts: 6603
Joined: Fri. Apr. 11, 2008 2:54 pm
Stoker Coal Boiler: Axeman Anderson 130 (pea)
Hot Air Coal Stoker Stove: Reading piece o' junk in the barn (rice)
Coal Size/Type: Pea size, Superior, deep mined
Location: Orrington, Maine

Post Sun. Sep. 15, 2013 6:57 am

As long as it stays below the blow off point of the pressure relief valve it's fine. Most are 30PSI. But, yes, the ideal would be as low as possible and still do the job.... 12 for a one or two story house, around 17 I think for a three story house. Generally.... 5 pounds for every 10 feet up.
Orrington, Maine
Fred

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gaw
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Posts: 2608
Joined: Fri. Jan. 26, 2007 2:51 am
Stoker Coal Boiler: Keystoker KA-6
Coal Size/Type: Rice from Schuylkill County
Location: Parts Unknown

Post Sun. Sep. 15, 2013 7:30 am

If you are worried over 16 psi you don’t have enough to worry about. :shock: Like the others said, it is a couple pounds higher than “normal” but it ain’t broke so I would not fix it.
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whistlenut
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Posts: 3549
Joined: Sat. Mar. 17, 2007 6:29 pm
Stoker Coal Boiler: AA130's,260's, AHS130&260's,EFM900,GJ & V-Wert
Hand Fed Coal Boiler: Franks,Itasca 415,Jensen, NYer 130,Van Wert
Hot Air Coal Stoker Furnace: Alaska, EFM, Keystoker, Yellow Flame
Hot Air Coal Stoker Stove: Alaska, Keystoker-2,Leisure Line
Hand Fed Coal Stove: Alaska, Gibraltar, Keystone,Vc Vigilant 2
Hand Fed Coal Furnace: Ford, Jensen, NYer, Van Wert,
Baseburners & Antiques: Glenwoods
Coal Size/Type: Barley, Buck, Rice ,Nut, Stove
Other Heating: Oil HWBB
Location: Central NH, Concord area

Post Sun. Sep. 15, 2013 12:05 pm

Larry, what size pressure tank do you have on that system? Your 16 lb question is not anything I would worry about......above 20, start looking for a reason.......or if it creeps up.
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lsayre
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Posts: 12189
Joined: Wed. Nov. 23, 2005 9:17 pm
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Blaschak Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW)
Location: N/E Ohio, between Medina and Wadsworth

Post Sun. Sep. 15, 2013 12:10 pm

whistlenut wrote:Larry, what size pressure tank do you have on that system? Your 16 lb question is not anything I would worry about......above 20, start looking for a reason.......or if it creeps up.
I have a #90 on it.
-Larry

Democracy rests upon the principle that collective wisdom arises from a pool of individual ignorance. A Republic rests squarely upon objective law, and fundamentally upon those laws which restrict the scope and actions of government.

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Rob R.
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Posts: 11343
Joined: Fri. Dec. 28, 2007 4:26 pm
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy
Location: Chazy, NY

Post Sun. Sep. 15, 2013 12:32 pm

You did your homework, that is a great tank to have on a coal-fired system. Every single expansion tank I have purchased has come through with about 8 psi. As you know, this is too low for a typical system that uses a static fill pressure of 12 psi. If the tank pressure isn't adjusted to match, you will have used part of the tank's expansion capacity before the water even gets heated.

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