Coal boiler pressure question

Coal boiler pressure question

PostBy: lsayre On: 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.
lsayre
 
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Stockton Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW)

Re: Coal boiler pressure question

PostBy: blrman07 On: 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
blrman07
 
Hand Fed Coal Boiler: Bucket a Day
Hand Fed Coal Stove: Vigilant Casting 2310
Baseburners & Antiques: rebuilding a 1906 March Brownback Double Heater, using a UMCO 1920's Pot Belly stove in the church
Coal Size/Type: Pea/Nut/Wood in the VC and anything that will fit in the Bucket a Day. It's not fussy.

Re: Coal boiler pressure question

PostBy: lsayre On: Sat Sep 14, 2013 10:30 am

To drop it, will I need to bleed it a bit?
lsayre
 
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Stockton Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW)

Visit Lehigh Anthracite

Re: Coal boiler pressure question

PostBy: Rob R. On: 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.
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy

Re: Coal boiler pressure question

PostBy: lsayre On: 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.
lsayre
 
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Stockton Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW)

Re: Coal boiler pressure question

PostBy: franco b On: 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.
franco b
 
Hand Fed Coal Stove: V ermont Castings 2310, Franco Belge 262
Baseburners & Antiques: Glenwood Modern Oak 114
Coal Size/Type: nut and pea

Re: Coal boiler pressure question

PostBy: Freddy On: 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.
Freddy
 
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

Re: Coal boiler pressure question

PostBy: gaw On: 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.
gaw
 
Stoker Coal Boiler: Keystoker KA-6
Coal Size/Type: Rice from Schuylkill County

Re: Coal boiler pressure question

PostBy: whistlenut On: 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.
whistlenut
 
Stoker Coal Boiler: AA130's,260's, AHS130&260's,EFM900,GJ&VanWert
Hand Fed Coal Boiler: Franks Boiler,Itasca415,NYer130,Van Wert
Hot Air Coal Stoker Furnace: Yellow Flame
Hot Air Coal Stoker Stove: Alaska-4,Keystoker-2,
Hand Fed Coal Stove: Alaska,Gibraltor,Keystone,Vc Vigilant 2
Hand Fed Coal Furnace: Van Wert, NYer's, Ford,Jensen.
Coal Size/Type: Rice,Buck,Pea,Nut&Stove
Other Heating: Oil HWBB

Re: Coal boiler pressure question

PostBy: lsayre On: 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.
lsayre
 
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Stockton Anthracite Pea
Other Heating: Resistance Boiler (13.5 KW)

Re: Coal boiler pressure question

PostBy: Rob R. On: 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.
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Coal Size/Type: Lehigh Rice
Other Heating: Dad's 1953 EFM Highboy

Visit Lehigh Anthracite