Coalgun- Puff backs & Explosions

Re: Help: I Have Repeated Explosions!!

PostBy: Freddy On: Fri Nov 11, 2011 4:16 am

Yanche wrote: If you forget to turn it back on you will get a hopper fire.



Bingo.... My buddy with the AHS has had one hopper fire....when he forgot to turn the asher back on after emptying the ash bucket. His unit has a heat sensor in the bottom of the hopper. After it burned all the paint off the neck it shut itself down. And, yes, he always, always keeps the lid on the hopper.
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: Help: I Have Repeated Explosions!!

PostBy: Bob On: Fri Nov 11, 2011 9:52 am

Yanche wrote:The boiler also came from the factory with a switch to turn off the grate motor. I assume it's for turning it off while you remove the ash bucket.


The switch to turn off the grate motor is recommended in the AHS manual for use during start up.
Bob
 
Stoker Coal Boiler: AHS 130
Coal Size/Type: Pea/Anthracite

Re: Help: I Have Repeated Explosions!!

PostBy: lsayre On: Fri Nov 11, 2011 11:57 am

I plan to purchase a second ash pan, so I will never have to shut off the grate switch while taking out and disposing of my ashes. After a quick swap of the ash pans, I can then take my good old time disposing of the ashes in the full pan.
lsayre
 
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Anthracite Pea
Other Heating: Resistance Boiler (if I ever get it fixed)

Re: Help: I Have Repeated Explosions!!

PostBy: Rob R. On: Fri Nov 11, 2011 12:00 pm

Good idea. I don't know why anyone would own a stoker boiler with only one ash pan...I have 8. Saturday is "ash day".
Rob R.
 
Stoker Coal Boiler: EFM DF520
Hand Fed Coal Stove: Hitzer 50-93
Other Heating: Dad's 1953 EFM Highboy

Re: Help: I Have Repeated Explosions!!

PostBy: watkinsdr On: Fri Nov 11, 2011 1:56 pm

A little off subject; but, since I started this thread, I give myself license to go off thread...

The "standard" AHS ash pan weighs 16 lbs empty... If 'yer lazy like me, you sometimes wait 3-4 days between dumping the ash pan---this translates into a "pain in the ash..." I had some extra Rubbermaid "table bus tubs" which my wife bought a few years ago, NOTE: They still have these tubs at Sam's Club, 2 ea. for approx. $14.00. I've been using them for about two weeks now; and, they seem to work pretty well. The plastic stays cool; and, I haven't noticed any burn marks yet... NOTE: I have my S260 elevated on 6" concrete blocks; which, seems to be just enough height to allow using these plasic tubs---any closer; and, the plastic will get too hot---don't ask me how I know... I only have 3 of these tubs now; but, if they continue to work, I plan on buying more...
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watkinsdr
 
Stoker Coal Boiler: AHS S260 Boiler

Re: Help: I Have Repeated Explosions!!

PostBy: rychw On: Fri Nov 11, 2011 5:25 pm

Yanche wrote:My puff backs ended when I had my boiler factory modified to the tombstone style inspection port cover and flapper with rotatable opening. My theory is idle draft improved when the air heated by the front of the boiler rises and enters the open flapper. This improved draft reduces the concentration of out gassing coal gases.


Yanche,

Who did your modification and why did you do it?
rychw
 
Stoker Coal Boiler: AHS 130
Coal Size/Type: Pea
Stove/Furnace Make: AHS
Stove/Furnace Model: 130

Re: Help: I Have Repeated Explosions!!

PostBy: Yanche On: Sat Nov 12, 2011 3:26 am

rychw wrote:
Yanche wrote:My puff backs ended when I had my boiler factory modified to the tombstone style inspection port cover and flapper with rotatable opening. My theory is idle draft improved when the air heated by the front of the boiler rises and enters the open flapper. This improved draft reduces the concentration of out gassing coal gases.


Yanche,

Who did your modification and why did you do it?

The mods to my boiler were done by AHS at their original factory location, Harrisonville, PA. It was returned to have an additional supply tapping added. My boiler came with only a single supply and return taping. Both were in the front of the boiler. I believe it better to pipe a boiler so you have internal water flow across the entire water volume. To do that I needed a second tapping. I scheduled the mods with Jeff. I arrived at their factory close to their starting time with my boiler on a pallet. They removed it with a fork life, did the mods and had me on my way home shortly after noon. Service was excellent and the price was reasonable. I had the tombstone style inspection port and thermocouple installed at the same time. Theromcouple only, no associated controls. That's still on my to do list.
Yanche
 
Stoker Coal Boiler: Alternate Heating Systems S-130
Coal Size/Type: Anthracite Pea

Re: Help: I Have Repeated Explosions!!

PostBy: rychw On: Sat Nov 12, 2011 7:59 am

Yanche wrote:I had the tombstone style inspection port and thermocouple installed at the same time.


Yanche,

I agree that the craftsmanship and quality of work on the AHS boiler is outstanding. It is a great boiler when it works safely. Why did you have thew tombstone style inspection port installed? I wonder why AHS now has that type of inspection port on all their new boilers. Is there anyone out there with a new AHS boiler and the new inspection port experiencing booms?
rychw
 
Stoker Coal Boiler: AHS 130
Coal Size/Type: Pea
Stove/Furnace Make: AHS
Stove/Furnace Model: 130

Re: Help: I Have Repeated Explosions!!

PostBy: lsayre On: Sat Nov 12, 2011 8:27 am

rychw wrote:I agree that the craftsmanship and quality of work on the AHS boiler is outstanding. It is a great boiler when it works safely. Why did you have the tombstone style inspection port installed? I wonder why AHS now has that type of inspection port on all their new boilers. Is there anyone out there with a new AHS boiler and the new inspection port experiencing booms?


No booms here (so far). Closing in on one month of burning. Mine is an October 2009 model, so it is two years old, but it is seeing its first use. It came with the tombstone cover.

As for ash pans, sometime after mine was made they apparently lowered the profile of the AHS boilers yet again, and now their ash pans are completely different. Mine still uses an ash pan that is probably the same as for the Axeman's. The new AHS ash pans are much lower in profile to fit the new lower bottom end. My ash pan is 11.25" high, and my ash door opening is about 12" in height. I think the new AHS boilers ash pan door opening is only about 10" tall.
lsayre
 
Stoker Coal Boiler: AHS S130 Coal Gun
Coal Size/Type: Anthracite Pea
Other Heating: Resistance Boiler (if I ever get it fixed)

Re: Help: I Have Repeated Explosions!!

PostBy: watkinsdr On: Sat Nov 12, 2011 10:55 am

On my late model S260, the ash door opening is 10.25" tall; and, my AHS ash pans (which I'm not using because they're so heavy...) are 9.5" tall. The Rubbermaid Heavy Duty Bus Boxes are working great so far. I'm seriously thinking about using my AHS ash pans for the cat's litter box... :lol:
watkinsdr
 
Stoker Coal Boiler: AHS S260 Boiler

Re: Help: I Have Repeated Explosions!!

PostBy: Bob On: Sat Nov 12, 2011 11:26 am

rychw wrote: Is there anyone out there with a new AHS boiler and the new inspection port experiencing booms?


I purchased my AHS-130 in 2007 and it has the tombstone cover. I had continuing problems with puff-backs over the first four seasons--destroying more than one barometric damper and even blowing the tombstone cover off on one occasion. So in my experience with the tombstone cover is that it alone is not a solution to the puff back problem.

This season, and I have been burning for 3+ weeks, I have yet to have a puff-back. Two things are different. First, while I purchased my coal from the same delivery agent and it came from the same breaker (Superior) the coal is different--this year it is white ash and in prior years it was red ash. Second I am operating at a lower SV--120. I never started out the season at 120 in the past. I have also noticed that I am getting more complete combustion of the coal with the SV at 120--there is no unburned coal visible.
Bob
 
Stoker Coal Boiler: AHS 130
Coal Size/Type: Pea/Anthracite

Re: Help: I Have Repeated Explosions!!

PostBy: dchartt On: Sat Nov 12, 2011 9:00 pm

my ahs130 is two weeks old, i experienced 3 puffbacks when i first fired her up and put a couple shovels of coal down in the hopper and closed the lid, that was pretty much my own fault though, other than that i havent had any problems with puffbacks
dchartt
 
Stoker Coal Boiler: AHS 130
Hand Fed Coal Stove: Glacier Bay

Re: Help: I Have Repeated Explosions!!

PostBy: Yanche On: Sat Nov 12, 2011 9:25 pm

The deep mined red ash Superior brand coal was definitely more likely to have puff backs. I had several over the three seasons I burned it. A couple were quite spectacular, blown baro across room, bent inspection port door, etc. I even saw one from outside. Loud boom, and a quick look at my chimney to see a cloud of fly ash exiting. Only thing better would have been a smoke ring. :-) Now with white ash coal and the tombstone style of inspection port, no problems.
Yanche
 
Stoker Coal Boiler: Alternate Heating Systems S-130
Coal Size/Type: Anthracite Pea

Re: Help: I Have Repeated Explosions!!

PostBy: tikigeorge On: Sat Nov 12, 2011 9:37 pm

Looking at the pictures of the exhaust pipe it doesn't look like you have any pitch. Just a thought.
tikigeorge
 
Stoker Coal Boiler: Keystoker KA-6
Stove/Furnace Make: Keystoker
Stove/Furnace Model: KA-6

Re: Help: I Have Repeated Explosions!!

PostBy: dchartt On: Sun Nov 13, 2011 1:11 pm

I stand corrected, I went up to the barn this morning to check on the boiler and found the baro door blown off the pipe and laying on the ground in front of the furnace
dchartt
 
Stoker Coal Boiler: AHS 130
Hand Fed Coal Stove: Glacier Bay