Steam Happens #24: Building a New Roberts-Type Boiler
Our boat, A Boy's Will, with my 50 year old Olfeldt boiler
Olfeldt boiler in boat
Olfeldt boiler diagram showing position above firebox. Note
lack of "waterlegs"
New Roberts-type boiler core drawing
End pieces removed to show water tube pattern
Steel core components welded
Bending table with mosaic of tubes full-scale and bending tools
Close-up of alternating tubes with 2 inch nipples on outer row
Steam drum tube ends
Tubes installed but not given final alignment adjustment. Forgot to take photos after final adjust...Oops!
Base fabricated. Note hangers for rebar fire grate
Core on base showing ashpit door
Note that base corners are open in above photo.
Smokebox slides between corners and sides of base,
and is also secured by two bolts above ash pit door as well as two bolts in rear.
This makes it very easy to remove entire external box assembly. from base and core.
Smoke box with aligned hole patches. Note rear end piece
already mounted and front end piece on table, insulated with standoffs in place
ready to mount in front. See below for details of standoff spools.
Nuts temporarily mounted
Wooden boiler cladding. Note fasteners.
Click on above photo to view YouTube video and more detail of boiler
Various fasteners used in boiler