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