520 Highboy

520 Highboy

PostBy: vwgtiman On: Mon Feb 28, 2011 2:44 pm

I liberated a 520 highboy recently and am thinking about swapping out my 350. Im thinking this will help me collect more heat from the coal but I need some opinions from the EFM masters here... Are the tubes w/ spinners better then the rectangular slots in my 350? What are the pros / cons? Thanks.
vwgtiman
 
Stove/Furnace Make: EFM-350 Losh-475

Re: 520 Highboy

PostBy: Rob R. On: Mon Feb 28, 2011 3:59 pm

The pros: All other things being equal, the Highboy should be more efficient at extracting heat due to the increased heat exchanger area. Most guys don't run the turbulators in the firetubes due to flyash collection, but in theory the turbulators (spinners) should slightly improve efficiency. The increased water capacity of the Highboy will also increase the flywheel effect of the boiler, and help prevent wide temperature swings. The front mounted tankless coil is a love/hate thing...but it is my preference.

The cons: The tube style heat exchanger is not as forgiving if left to corrode. The plate boilers are easier to clean (my opinion), and easier to fix if something leaks...but most EFM guys will tell you that a leaky tube boiler is a rare occurrence. There are people that can repair tube boilers, but they are far and few between.

With all of that said, if your heat demands are low and you don't need to run the stoker at a high feed rate, I don't think it's worth the time/effort/$ to swap out the 350. I saw your other post that said it can't go lower than 4 teeth...which implies 4 teeth is more heat than you need. I suggest you call contact forum member scrapper_23jr and he will tell you what parts are needed to convert your stoker to the current feed control setup.

-Rob
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: 520 Highboy

PostBy: vwgtiman On: Mon Feb 28, 2011 4:39 pm

Ok, thanks for the advice.
vwgtiman
 
Stove/Furnace Make: EFM-350 Losh-475

Re: 520 Highboy

PostBy: vwgtiman On: Tue Mar 01, 2011 8:19 am

Here are some photos:
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vwgtiman
 
Stove/Furnace Make: EFM-350 Losh-475

Re: 520 Highboy

PostBy: coal berner On: Tue Mar 01, 2011 11:16 am

vwgtiman wrote:I liberated a 520 highboy recently and am thinking about swapping out my 350. Im thinking this will help me collect more heat from the coal but I need some opinions from the EFM masters here... Are the tubes w/ spinners better then the rectangular slots in my 350? What are the pros / cons? Thanks.


The Sq Ft Heating surface on a 350 is 22.5 Tube Or Plate 29 to 31 gals of water
A 520 is 28.3 Sq FT Tube or Plate 40 to 41 gals of water
A Highboy is 37.5 Sq Ft Tube Only 54 gals of water
700 is 43.3 Sq FT Tube or Plate 73 to 74 gals of water
900 is 59.0 Sq Ft Tube or Plate 93 to 94 gals of water
1300 is 80.0 Sq Ft Tube or Plate 120 gals of water

The only Way a plate boiler is easier to clean is if it is a Sq Door DF model
All Round door tube or plate models all get cleaned the same way Thur the Viewing door Ash door and flue breach some boilers did have clean out door on the back of boiler which made it a little easier cleaning out.

turbulators / spinners were design to slow the flue gasses down to help keep heat in the heat exchanger tubes longer
and lowering the stack temps .

The down fall is they collect a lot of Fly Ash quicker and can block the the tubes up screwing the draft up creating more problems like CO build up and out fires killing the draft will put a fire out in no time .

P.S. there is a big difference between a Fire tube and a Heat exchanger tube boilers .
One has water going thur it being heated up from the open flame /fire The other has hot gases / heat Transfer going
thur them with no flame on the tubes or water flowing thur the inside of them .

EFM are Heat exchanger tube boilers Not a Fire tube boiler where the flame is heating the water flowing thur the inside of the tube's .

The only coal stoker fire tube boiler being made today that I know of is the Harman VF 3000 and L.L. stove Boiler
coal berner
 
Stoker Coal Boiler: 1986 Electric Furnace Man 520 DF
Stove/Furnace Make: Electric Furnace Man
Stove/Furnace Model: DF520

Re: 520 Highboy

PostBy: Rob R. On: Tue Mar 01, 2011 12:00 pm

I always thought the term "fire tube" boiler referred to a boiler that had either flames or heated flue gases passing through the tubes. It makes sense that if there is no flames in or near the tubes it could be called a tube heat exchanger boiler, I had just never heard the term before.

vwgtiman, how did the tankless coil area look on the boiler? From the picture it looks like it had been leaking a while.
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: 520 Highboy

PostBy: vwgtiman On: Tue Mar 01, 2011 3:33 pm

The coil seal was leaking for a while. It is pitted outside the seat area of the seal but not under it. Id say an 1/8 inch of material in some spots are gone. The leaking did reak havoc on the serial no. plate. I can make out Fitzg and some #'s but nothing is complete. Lost forever....
vwgtiman
 
Stove/Furnace Make: EFM-350 Losh-475

Re: 520 Highboy

PostBy: coal berner On: Wed Mar 02, 2011 11:53 am

vwgtiman wrote:The coil seal was leaking for a while. It is pitted outside the seat area of the seal but not under it. Id say an 1/8 inch of material in some spots are gone. The leaking did reak havoc on the serial no. plate. I can make out Fitzg and some #'s but nothing is complete. Lost forever....

Boiler is 5/16" thick so it sounds like you would need a patch plate welded in contact Steve /scrapper 23 jr for a weld Job
and any parts you need .
Being it has a round viewing door the year would be between 1951 & 1955 .
1948 1949 & some 1950 had a small sq door .
Fitzgibbons boiler Co.
coal berner
 
Stoker Coal Boiler: 1986 Electric Furnace Man 520 DF
Stove/Furnace Make: Electric Furnace Man
Stove/Furnace Model: DF520